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Nanoscale Sn-based alloy materials are high-performance anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), however, the insertion and extraction of Li+/Na+ during the charging and discharging process can lead to dramatic expansion of the electrode volume as well as collapse and crushing of the structure. Therefore, we successfully synthesized a new mesoporous Sn/SnO 2 -Ni@C composite anode material. Mesoporous Sn/SnO 2 -Ni@C has excellent electrochemical properties and can reach large reversible capacities after 200 cycles at 0.2 A g −1 (LIBs: 1020.7 mAh g −1, SIBs: 342.6 mAh g −1) as well as remarkable stability after 1000 cycles at 1.0 A g −1 (LIBs: 864.6 mAh g −1, SIBs: 219.3 mAh g −1). In addition, mesoporous Sn/SnO 2 -Ni@C also has outstanding rate performance (LIBs: 564.6 mAh g −1 at 5.0 A g −1, SIBs: 212.5 mAh g −1 at 1.0 A g −1). In particular, the unique mesoporous structure not only provides additional transport channels for Li+/Na+ and electrons, but also enables the electrode material to be fully immersed in the electrolyte. Meanwhile, the synergistic effect between Sn/SnO 2 -Ni alloy can prevent shuttle effect and alleviate volume expansion, the presence of Ni can prevent the coarsening of Sn. Thus, mesoporous Sn/SnO 2 -Ni@C has fast kinetics and is a promising anode material for LIBs/SIBs. [Display omitted] [ABSTRACT FROM AUTHOR]

The <001>-oriented 0.7PMN–0.3PT and 0.67PMN–0.33PT crystals are characterized under uniaxial stress and electric field loading above the coercive field. Strain-electric-field and electric-displacement-electric-field hysteresis loops are measured at various compressive stresses showing a notable effect of stress on the electromechanical coupling. A moderate uniaxial stress can advance their electromechanical properties. Stress-strain curves are run at zero electric field, showing that depolarization for <001>-oriented 0.7PMN–0.3PT crystal begins at 7 MPa, while as little as 3 MPa for 0.67PMN–0.33PT crystal, placing a severe limitation in actuator applications. [ABSTRACT FROM AUTHOR]

High-quality lead-free 0.5Ba(Zr 0.2 Ti 0.8 )O 3 –0.5(Ba 0.7 Ca 0.3 )TiO 3 thick films with the thickness of 8 μm were prepared by screen printing with a solution-immersion process. The solution-modified films near the morphotropic phase boundary (MPB) showed very dense and homogenous microstructure with large grain size, and exhibited moderate dielectric constant of 1680 and low dielectric loss of 1.38% at 10 kHz with 0 V bias at room temperature. High dielectric tunability up to 76.7% at 12 kV/mm and 10 kHz was achieved in the modified films. The excellent dielectric properties associated with good microstructure and MPB composition, make the lead-free films be a promising candidate for dielectric tunable capacitor applications. [ABSTRACT FROM AUTHOR]

High-quality piezoelectric 0.5Ba(Zr 0.2 Ti 0.8 )O 3 –0.5(Ba 0.7 Ca 0.3 )TiO 3 thick films with the thickness of 6 μm were prepared by screen printing with solution infiltration process. The modified films near the morphotropic phase boundary (MPB) showed very dense and homogenous microstructure with large grain size, and presented markedly enhanced piezoelectric properties with large remanent polarization of 22 μC/cm 2 and a longitudinal piezoelectric constant d 33 of 220 pC/N, which were over two times higher than those of the screen printed films without the solution infiltration process. The excellent piezoelectric properties comparable to the case of lead-based thick films, make the modified films a promising candidate for practical applications in lead-free microdevices such as piezoelectric microelectromechanical systems (MEMS). [ABSTRACT FROM AUTHOR]

Abstract: High-quality piezoelectric Ba(Zr0.2Ti0.8)O3–50(Ba0.7Ca0.3)TiO3 films with very dense and homogenous microstructure were fabricated using chemical solution infiltration into porous screen-printed films. The films with a thickness of 10μm exhibited high relative permittivity of 2380, low dielectric loss of 1.6% (at 10kHz), large remanent polarization of 22μC/cm2, and large longitudinal piezoelectric constant d 33 of 220pC/N, which is even better than the case of lead-based piezoelectric films. The excellent electrical properties make the films a promising candidate for practical applications in lead-free microdevices such as piezoelectric microelectromechanical systems. [Copyright &y& Elsevier]

Abstract: 0.68PbMg1/3Nb2/3O3–0.32PbTiO3 (PMN–PT) thin films with a lead zirconate titanate Pb(Zr0.3Ti0.7)O3 (PZT)/PbO x buffer layer were deposited on Pt/TiO2/SiO2/Si substrates by radio frequency magnetron sputtering technique, and pure perovskite crystalline phase with highly (100)-preferred orientation was formed in the ferroelectric films. We found that the highly (100)-oriented thin films possess not only excellent dielectric and ferroelectric properties but also a large electrocaloric effect (13.4K at 15V, i.e., 0.89K/V) which is attributed to the large electric field-induced polarization and entropy change during the ferroelectric–paraelectric phase transition. The experimental results indicate that the use of PZT/PbO x buffer layer can induce the crystal orientation and phase purity of the PMN–PT thin films, and consequently enhance their electrical properties. [Copyright &y& Elsevier]

Abstract: (001)-oriented 0.67PbMg1/3Nb2/3O3–0.33PbTiO3 thin films with a pure perovskite crystalline phase were deposited on LaNiO3-coated SiO2/Si substrates by the rf magnetron sputtering technique. We found that the as-grown thin films with (001)-oriented texture possess not only excellent dielectric and ferroelectric properties but also a large electrocaloric effect (14.5 K in 12 V, i.e., 1.21 K/V) which is attributed to the large polarization and entropy change during the ferroelectric–paraelectric phase transition at a high electric field. The discovery of the large electrocaloric effect in highly textured ferroelectric thin films widens their potential applications, such as in solid-state electrical refrigeration. [Copyright &y& Elsevier]

The pyroelectric properties of (1− x)Pb(Mg1/3Nb2/3)O3− xPbTiO3 (PMN− xPT) single crystals with various compositions and orientations have been investigated using a dynamic method. Excellent pyroelectric performances can be achieved in 〈111〉-oriented rhombohedral PMN− xPT (0.24≤ x≤0.30) crystals, where the measurement direction corresponds to the polar axis of the crystal. At room temperature, the pyroelectric coefficient and the detectivity figure of merit ( F d) for the 〈111〉-oriented PMN–0.28PT single crystal are 8.55 × 10−4 C·(m2·K)−1 and 9.89 × 10−5 Pa−1/2 (100 Hz), respectively, superior to those of the widely used pyroelectric materials. They are also weak temperature dependent and nearly independent of frequency. These outstanding pyroelectric performances make the single crystals a promising candidate for uncooled infrared detectors and thermal imagers. [ABSTRACT FROM AUTHOR]

Abstract: Effect of poling conditions (different poling fields and temperatures) on dielectric and piezoelectric property of 〈001〉-oriented 0.70Pb (Mg1/3Nb2/3)O3–0.30PbTiO3 crystal was investigated. The results show, that it is easy for the crystal to be full poled in high temperature, while it is difficult for the crystal in low temperature. An appropriate poling condition for the crystals is suggested. [Copyright &y& Elsevier]

The domain states and phase transitions in 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 single crystals were investigated by studying their relative permittivity under various dc bias at constant heating and cooling rates. The orientation dependence of the bias field effect was revealed by examining the temperature dependence of relative permittivity as a function of crystal orientation (the 〈111〉, 〈011〉 and 〈001〉 directions) and dc bias field. The crystals basically have a macrodomain rhombohedral ferroelectric state in the ferroelectric phase under zero dc bias. External bias field could modulate the domain state and induce a stable macrodomain state in the crystals. Also, it is proposed that the dc bias applied along the 〈001〉 or 〈011〉 direction could induce a tetragonal ferroelectric phase or an orthorhombic ferroelectric phase, respectively, in an intermediate temperature range. [Copyright &y& Elsevier]

An optimum composition range (29%≤x≤31%) of 〈001〉 oriented (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3(PMNT) crystals was ascertained for multilayer actuator applications, which exhibited high-strain and low-hysteresis behavior. A −1.5 kV/cm negative E-field can be applied to PMNT ferroelectric samples with low hysteresis. Forty layer actuators with individual element sizes of 7×7×0.7 mm3 were fabricated under identical processing conditions using two different materials: (1) single crystal PMNT and (2) commercial PZT-SF ceramics. Under free-load conditions, 48 μm displacements can been achieved in PMNT actuators at electric fields ranging from −1.5 to 10 kV/cm, which is more than twice the displacement of the PZT-SF actuators driven from −10 to 10 kV/cm. Under 4 kg loading, the displacements in PMNT stain actuators are decreased to 42.5 μm. [Copyright &y& Elsevier]

Electric-field-induced strain behavior of (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMNT) crystals with different orientations and compositions was investigated for use as electromechanical actuators. Crystallographically, high strains with low hysteresis were achieved for 〈001〉 oriented rhombohedral crystals (29%≤x≤31%) near a morphotropic phase boundary, rather than 〈110〉 and 〈111〉. Domain instability could explain inferior strain levels and large hysteresis for 〈110〉 and 〈111〉 oriented crystals. Ultrahigh strain levels up to 1.8% could be achieved for 〈001〉 oriented PMNT crystals, being related to an E-field induced phase transition. −2 kV/cm negative E-field can be applied to PMNT ferroelectric material with low hysteresis. High strain with low hysteresis makes PMNT crystals promising candidates for high performance solid-state actuators. [Copyright &y& Elsevier]

Potassium-ion batteries (PIBs) are considered alternatives to lithium-ion batteries because of their comparatively cheaper manufacturing costs and lower potential (2.936 V compared to standard hydrogen electrodes). However, their large ionic radii and unstable structures hindered their satisfactory electrochemical performance. In this study, F–Sn/SnO x @C, a novel porous layered composite material, was prepared using NaCl as a template for in situ etching to obtain a promising negative electrode material for PIBs. The significant specific surface area of the composite material and the uniform embedding of tin nanoparticles within the layered porous carbon shell, contributed to its excellent potassium intercalation/deintercalation performance. Fluorine doping enhanced electron transfer, prevented nanoparticle aggregation, and improved electrolyte penetration and potassium ion migration. The PIBs prepared from this electrode showed high potassium storage capacity, outstanding cycle stability (retaining 263 mAh g−1 after 200 cycles at 100 mA g−1), and remarkable rate capability (505.6, 288.4, 193.5, 134.1, and 83.3 mAh g−1 at 0.1, 0.2, 0.3, 0.5, and 1.0 A g−1, respectively). These results provide a straightforward solution for improving the electrochemical performance of PIBs. [ABSTRACT FROM AUTHOR]

Abstract: In microwave tunable devices, one of the major challenges encountered is the simultaneous minimization of the material''s dielectric loss and maximization of dielectric tunability. In this work, Ba0.6Sr0.4TiO3 thin film with the thickness of 300nm was deposited on Pt/SiO2/Si substrates using radio-frequency magnetron sputtering technique, and its dielectric properties were investigated. Due to the high temperature annealing process at substrate temperature of 600°C, well-crystallized Ba0.6Sr0.4TiO3 film was deposited. The dielectric constant and dielectric loss of the film at 100kHz are 300 and 0.033, respectively. Due to the good crystallinity of the Ba0.6Sr0.4TiO3 films deposited by radio-frequency magnetron sputtering, high dielectric tunability up to 38.3% is achieved at a low voltage of 4.5V. [Copyright &y& Elsevier]

KNbO3-based ferroelectrics have drawn much attention in recent years owing to their good piezoelectric performance among Pb-free piezoelectrics. However, little is known about the aging effect of these materials. In the present study, the authors systematically studied the aging effect of a Mn-doped (K0.99Li0.01)(Nb0.65Ta0.35)O3 ceramic with an aim to find an aging-induced recoverable electrostrain effect based on a reversible domain switching mechanism. They found that aging in the ferroelectric state made the otherwise normal hysteresis loop into a double loop, and more interestingly the aged sample demonstrated a large recoverable electrostrain of 0.125% at 4 kV/mm in an unpoled state. Such a behavior persisted up to 140 °C and showed good recoverability. The aging-induced double hysteresis and recoverable electrostrain suggest a reversible domain switching mechanism due to a symmetry-conforming short-range ordering of point defects. The striking similarity of the aging effect between acceptor-doped A+B5+O3 and acceptor-doped A2+B4+O3 systems indicates a common physical origin of aging. [ABSTRACT FROM AUTHOR]

[Display omitted] • Nano-SnO 2 provides more active sites for lithium storage. • WO 3 maintains the volume size of SnO 2 and prevents the chaotic aggregation of Sn. • Graphite shortens the transmission distance of electrons and Li+ and prevents the volume expansion of SnO 2 -WO 3. • School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, PRC. SnO 2 -WO 3 @C (SWC) anode material was synthesized by hydrothermal and ball milling methods. WO 3 has a catalytic effect and enhances the efficiency of Sn/Li 2 O conversion to SnO 2 while also effectively preventing the coarsening and stacking of Sn. Thus, SWC shows a large reversible capacity of 1070.4 mAh/g after 200 cycles at 0.2 A/g, a remarkable rate performance of 518.7 mAh/g at 5.0 A/g and a stable long-term cyclability of 1433.3 mAh/g after 900 cycles at 1.0 A/g. So, SWC is expected to become the mainstream choice for anode electrode materials in lithium-ion batteries (LIBs). [ABSTRACT FROM AUTHOR]

Optimizing the structure of materials has proven to be an efficient solution for improving the electrochemical performance of lithium-ion batteries. In this work, SnO 2 -WS 2 -CNTS (SWC) ternary composites were prepared by hydrothermal and ball milling methods to first obtain SnO 2 -WS 2 mixture, which was then embedded on CNTS to form a special multi-level structure. Due to the special 2D structure of transition metal sulfide WS 2 and CNTS, the de-intercalation speed of lithium ions is greatly increased and the inherent particle aggregation phenomenon of SnO 2 is weakened. The three materials show their advantages while compensating for each other's disadvantages, forming an interesting synergistic effect which results in extremely stable anode materials. At 0.2Ag-1, the capacity of SWC reaches 930.71 mAhg-1 after 100 cycles, and reaches 1043 mAhg-1 after 1000 cycles at 1.0Ag-1. It is worth noting that after multiple cycles, SWC still exhibits an extremely stable state in the SEM image. The above results confirm that the special structure of SWC leads to excellent electrochemical performance, and its simple preparation method makes it a potential leading battery anode material in the future. [ABSTRACT FROM AUTHOR]

In this work, SnO 2 and Sn nanoparticles adhered to the surface of rGO (SnO 2 /Sn/rGO) applied as potassium ion batteries (KIBs) anode materials were synthesized via thermal reduction. Preparing SnO 2 material into a nanostructure for modification can reduce ion diffusion distance to improve the number of active sites appropriate for K+ adsorption, and efficiently reduce the volume change which is conducive to enhancing the potassium storage capacity. Besides, layered rGO inhibits SnO 2 /Sn aggregation, while increased surface area also reduces diffusion channel and electrolyte contact. However, larger specific surface area result in a lower initial Coulomb efficiency (ICE). The approach adopted here is to force the solid electrolyte interface (SEI) to fully emerge during the first charge-discharge cycle by using electrolytes containing 1 M KFSI in EC and DEC (1:1, v/v). According to density functional theory (DFT) analysis, the doping of rGO and SnO2 effectively enhanced the adsorption of potassium atoms and reduced the diffusion barrier of K+. Therefore, SnO 2 /Sn/rGO nanocomposites have a high specific capacity (325.8 mAhg−1 after 350 cycles at 0.1 Ag-1), an excellent ICE (66.57%), and a long cycle life (203.6 mAhg−1 after 1000 cycles at 0.5 Ag-1). [ABSTRACT FROM AUTHOR]

Crystalline silicon solar cells produced by doping processes have intrinsic shortages of high Auger recombination and/or severe parasitic optical absorption. Dopant-free carrier-selective contacts (DF-CSCs) are alternative routines for the next generation of highly efficient solar cells. However, it is difficult to achieve both good passivating and low contact resistivity for most DF-CSCs. In this paper, a high-quality dopant-free electron-selective passivating contact made from ultra-low concentration water solution is reported. Both low recombination current (J0) ~10 fA/cm2 and low contact resistivity (ρc) ~31 mΩ·cm2 are demonstrated with this novel contact on intrinsic amorphous silicon thin film passivated n-Si. The electron selectivity is attributed to relieving of the interfacial Fermi level pinning because of dielectric properties (decaying of the metal-induced gap states (MIGS)). The full-area implementation of the novel passivating contact shows 20.4% efficiency on a prototype solar cell without an advanced lithography process. Our findings offer a very simple, cost-effective, and efficient solution for future semiconductor devices, including photovoltaics and thin-film transistors. [ABSTRACT FROM AUTHOR]

Abstract: Double ferroelectric hysteresis (P–E) loops and large recoverable electrostrains of >0.13% at 5kV/mm are observed in aged Mn-doped orthorhombic KNbO3-based [K(Nb0.90Ta0.10)O3] lead-free ceramics over a wide temperature range of 25–140°C. The observations are found to have striking similarities to tetragonal ferroelectrics, besides following a point defect-mediated reversible domain switching mechanism of aging driven by a symmetry-conforming short-range ordering (SC-SRO) of point defects. Such aging effects, being insensitive to crystal structure and constituent ionic species, provide a useful way to enhance electromechanical properties of lead-free ferroelectric material systems. [Copyright &y& Elsevier]

Abstract: A high electromechanical activity is observed in the [(K0.5Na0.5)1−x Li x ](Nb0.8Ta0.2)O3 (x =0, 0.02, and 0.03) lead-free ceramic system at and around the orthorhombic (O)–tetragonal (T) phase transition temperature (T O–T ). This activity is found to originate from an O–T phase transition region at ambient temperature rather than a classical morphotropic phase boundary (MPB) region intrinsic in the Pb(Zr1−x Ti x )O3 (PZT) lead-based ceramic system. Li modification enables a large decrease in T O–T instead of constituting a classical MPB. In contrast to the nearly temperature-independent classical MPB behavior in the PZT system, the strong temperature-dependent phase transition behavior in the system may impose a challenge to temperature demanding applications. [Copyright &y& Elsevier]

Material Nano-genesis has gradually obtained more technical feedback and support in the study of lithium batteries, but problems such as volume expansion still need in-depth study. In this paper, SnO 2 –TiO 2 –CNS ternary composites were prepared by hydrothermal method and ball milling. Depending on the layered structure, the SnO 2 –TiO 2 nanoparticles are uniformly attached to carbon nanosheets. It is noteworthy that the volume variation of SnO 2 was alleviated by mixed TiO 2 and CNS, thus generating a wider space to move around for the lithium ion during the conduction process. The STC was tested for 100 cycles at 0.2 Ag-1 and the capacity was achieved 1046.1 mAhg−1. At 1.0 Ag-1, the capacity of STC can attain 1443.3 mAhg−1 after 1000 cycles. Then, the SEM image of the recovered electrode material was measured, and it was observed that the SnO 2 –TiO 2 –CNS composite remained stable. [ABSTRACT FROM AUTHOR]

• SnO 2 -Ti 2 C-C composite has been synthesized by hydrothermal and balling methods. • The ultrathin graphite nanosheet structure can facilitate lithium-ion transport. • Carbon coating can protect Ti 2 C from oxidation and self-stack. • The ternary SnO 2 -Ti 2 C-C composite can withstand high stress during cycling. • SnO 2 -Ti 2 C-C composite shows high rate and cycling stability. [Display omitted] A SnO 2 -Ti 2 C-C nanoparticle composite anode was synthesized by using facile ball milling combined with hydrothermal treatment. The SnO 2 -Ti 2 C nanoparticles were homogeneously coated with graphite nanosheets by ball milling. Graphite nanosheets served as ideal volume expansion buffers and good electron conductors. Consequently, a high initial coulombic efficiency of 80.3% was displayed, and the system exhibited a high reversible capacity of 1036.87 mAh g−1 maintained after 200 cycles at 0.2 A g−1, a rate capacity of 447.58 mAh g−1 at a high current density of 5.0 A g−1, and long cycling stability with a capacity of 763.18 mAh g−1 after 500 cycles at 2.0 A g−1. These results indicate that the incorporation of Ti 2 C, graphite nanosheets, and SnO 2 enhanced the performance of SnO 2 -based anodes for battery applications. [ABSTRACT FROM AUTHOR]

[Display omitted] • Bimetallic alloy nanoparticles enhance the cycling stability during K intercalation/de-intercalation process. • A novel preparation of PIB anode via a scalable bimetallic alloy nanoparticles and carbonization. • The doped N and O elements increase the contact sites between the electrode materials and electrolyte. • The composite material has bimetallic alloy active site and conductive carbon frame. Metal-organic frameworks (MOFs) have great potential as anode materials for potassium-ion batteries (PIBs) due to their hierarchical porous structures, large number of reaction sites, and adjustable chemistry. However, the larger size of potassium ions adversely impacts the electrochemical performance and specific capacity. Therefore, it is imperative to develop novel electrode materials featuring distinctive structures for PIBs. This study achieved bimetal introduction by adding Ammonium ferric citrate during ZIF-67 growth. The resulting metal–organic skeleton of the bimetallic alloy nanoparticle (FeCo@PAZ-C) exhibits a core–shell structure and adorned with numerous microspheres on its surface, thereby offering an abundance of active sites for K+ storage. This architecture effectively reduces the diffusion path length for potassium ions and enhances electron transport pathways, ultimately contributing to improved performance. At 100 mA g−1 and after 500 cycles, the FeCo@PAZ-C electrode material demonstrated a stable specific capacity of 328 mAh/g with 95 % capacity retention. This self-sacrificing template method for MOFs offers a new approach to developing high-capacity and cycling-stable potassium-ion battery materials, broadening their potential applications. [ABSTRACT FROM AUTHOR]

• Innovative porous structures formed by PVDF-Derived carbon: Our approach strategically coats active materials with carbon, creating effective porous structures. • Enhanced red phosphorus performance: The composite material promotes electron transfer and accommodates significant volume changes during sodium-ion cycling. • PVDF benefits: Using PVDF as a carbon source results in a structured, flexible, and mechanically strong carbon framework. • Outstanding capacity retention: P@C maintains 336.7mAh g−1 capacity after 200 cycles at 0.2 A g−1 and exhibits minimal degradation even after 500 cycles at 1 A g−1. Given the widespread availability of sodium on our planet, sodium-ion batteries (SIBs) hold substantial promise as cost-effective energy storage solutions. Red Phosphorus (red P) has emerged as a promising candidate for SIBs anodes due to its impressive theoretical capacity of 2596mAh g−1. However, red P faces inherent challenges, mainly due to its insulating nature and significant volume changes during cycling, which adversely affect its cycling and rate performance. To overcome these challenges, we have developed a novel material called P@C, composed of carbon-coated and porous carbon structures. The synthesis of P@C involves integrating red P with PVDF and a series of carefully controlled steps, including ultrasonic dispersion, magnetic stirring, centrifugation, and high-temperature calcination. This well-designed composite material facilitates electron transfer and provides ample space within its porous carbon structure to accommodate the substantial volume changes associated with phosphorus during sodium insertion/extraction. The use of PVDF as a carbon source contributes to the creation of a defined porous carbon framework, enhancing the material's flexibility, mechanical strength, and ease of processing. As a result, when employed as an anode material for SIBs, the P@C composite material exhibits exceptional cycling stability and remarkable rate performance. Notably, it demonstrates superior capacity retention, maintaining 336.7mAh g−1 after 200 cycles at 0.2 A/g, and excellent cycling durability, with minimal capacity degradation even after 500 cycles at 1 A/g.This innovative work, characterized by its strategic carbon-coating approach that effectively encapsulates the active material within porous structures, provides valuable insights into the development of high-performance electrode materials for metal-ion batteries and other energy storage applications. [ABSTRACT FROM AUTHOR]

The tunable emission characteristics of Er3+ doped and Er3+/Eu3+ co-doped Na 5 La(MoO 4) 4 phosphors prepared via high-temperature solid phase method were investigated. The microstructure of the modified phosphor was studied by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy, and its luminescence properties were analyzed by photoluminescence excitation and photoluminescence spectra. The energy transfer mechanism of Er3+ ions to Eu3+ ions was investigated by changing the concentration of Eu3+ ions to induce the spectral changes, and the photoluminescence decay lifetime was measured to validate the findings. Notably, under excitation at 380 nm, the co-doped phosphors exhibited tunable emission ranging from green to orange-red. Furthermore, Na 5 La(MoO 4) 4 :0.04Er3+/0.04Eu3+ phosphor, when combined with a 380 nm chip, achieved desired warm white light emission. These promising results underscore the potential application of Na 5 La(MoO 4) 4 :0.04Er3+/0.04Eu3+ phosphor in solid-state lighting. [ABSTRACT FROM AUTHOR]

SnO 2 –ZrO 2 composite nanoparticles were embedded in the few-walled carbon nanotubes (FWCNTs) network to synthesise a ternary SnO 2 –ZrO 2 -CNT nanocomposite by the hydrothermal and ball milling methods. The SnO 2 –ZrO 2 composite was uniformly dispersed in the CNT matrix. The CNTs in the composite alleviated the volume expansion during cycling, improved conductivity, and shortened the transmission path of electrons and Li+. Therefore, the SnO 2 –ZrO 2 -CNT composite showed high reversible capacity of 1072.2 mAhg−1 after 200 cycles at 0.2 Ag-1 with high initial coulomb efficiency of 77.9% and >98.8% in the following cycles, high-rate capacity of 653.6 mAhg−1 at 5.0 Ag-1, and long-term capacity of 610.7 mAhg−1 at 5.0 Ag-1 after 1000 cycles. Because of its outstanding properties, the SnO 2 –ZrO 2 -CNT nanocomposite is a promising anode material for next-generation lithium-ion batteries. [ABSTRACT FROM AUTHOR]

[Display omitted] • SnO 2 -MoO 2 -GO composite have been synthesized by facial ball milling. • Ultra-thin Graphene Oxide nanosheets can promote the transport of lithium ions. • SnO 2 –MoO 2 –GO composite shows high rate and cycling stability. Ternary SnO 2 -MoO 2 -GO (SMGO) nanocomposites were synthesized by hydrothermal method, modified Hummers method, and ball milling method. SMGO nanocomposites have the following advantages, including mitigating volume expansion during cycling, enhancing conductivity, and reducing the transmission path length for both electrons and Li+. Consequently, the SMGO composite material demonstrates a capacity of 1215.2 mAh/g after 200 cycles at 0.2 Ag−1, and a capacity of 1032.9 mAh/g after 1000 cycles at 1.0 Ag−1. Moreover, subsequent SEM analysis of the electrode material reveals the absence of accumulation or notable cracks, underscoring the remarkable cycling stability of the SMGO composite material. [ABSTRACT FROM AUTHOR]

The Sm3+ and La3+ co-doped Na 5 Y(MoO 4) 4 orange-red phosphors were synthesized by solid phase method at 600 °C. The crystal structure, phase purity, thermal stability, and luminescence performance were comprehensively analyzed. Under 405 nm excitation, the phosphors emit the orange-red light because of the 4G 5/2 -6H 5/2 , 4G 5/2 -6H 7/2 , 4G 5/2 -6H 9/2 , and 4G 5/2 -6H 11/2 transitions of Sm3+ ions. The enhancement of emission intensity with La3+ ions doping in phosphors is due to the environmental effect of the crystal field around the luminous center. When it is combined with commercial LED chips, the device emits orange-red light, and the luminescence spectrum coincides with the PR pigment absorption spectrum of the plant, indicating that the potential of Sm3+ and La3+ co-doped Na 5 Y(MoO 4) 4 phosphors in solid-state lighting application. • The Na 5 Y 0.89 La 0.05 (MoO 4) 4 :0.06Sm3+ phosphors is thermally stable, which is suitable for the preparation of LED. • The emission of Na 5 Y(MoO 4) 4 :Sm3+ phosphor was enhanced by the introduction of La3+. • At 405 nm excitation, Na5Y(MoO4)4:0.06Sm3+ phosphors emit orange-red light, and the electroluminescence spectrum of Na 5 Y 0.89 La 0.05 (MoO 4) 4 :0.06Sm3+ shows the emission spectra at 550–700 nm coincide with the PR absorption spectra, indicating that the device has potential application in plant cultivation. [ABSTRACT FROM AUTHOR]

Organic pollutants in water seriously destroy the ecological environment and endanger human health. The photocatalyst composed of a metal-organic framework (MOF) and quantum dots (QDs) allows stable and efficient degradation of organic pollutants. A novel BiVO 4 QDs/NH 2 -MIL-125 (BM) photocatalyst has been prepared by depositing of BiVO 4 QDs in the Ti-based MOF (NH 2 -MIL-125(Ti)). The results indicate that the BiVO 4 QDs/NH-MIL-125 sample has a porous structure with a concentrated pore size distribution and a large specific surface area. The decoration of BiVO 4 QDs effectively broadens the optical response range of NH 2 -MIL-125 (NM). It is worth noting that 1%BiVO 4 QDs/NH 2 -MIL-125 displays high photocatalytic activity in the degradation of 30 mg/L Rhodamine B (RhB) solution, and the degradation rate constant is 2.337 × 10−2 min−1, which is 4.2 and 5.4 times higher than NH 2 -MIL-125 and BiVO 4 QDs, respectively. In the process of degrading RhB, h+ and ⋅O 2 − play the major roles in the RhB degradation. The construction of heterojunction between BiVO 4 QDs and NH 2 -MIL-125 is favorable for photogenic carrier migration and inhibits electron and hole recombination. In addition, proposed a Z-Scheme reaction mechanism based on the band potential, where the structure favors carrier migration without photoelectron energy loss. This work is expected to promote the QD-MOF composites in water treatment. • A novel composite photocatalyst of BiVO 4 QDs/NH 2 -MIL-125 is synthesized for wastewater treatment. • BiVO 4 /NH 2 -MIL-125 demonstrated a 4.2 times higher photocatalytic efficiency than pure NH 2 -MIL-125. • A possible Z-Scheme reaction mechanism have been proposed to explain the improved photocatalytic performance. [ABSTRACT FROM AUTHOR]

[Display omitted] • This pore-like structure promotes electrolyte penetration as well as provides good intergranular electrical contact, which shortens the Li+ transport distance of electrons and F doping enhances the loading of SnO 2 -NiO particles on the surface of carbon materials and enhances electron transport and Li+ diffusion in the composite. • The nano-SnO 2 particles can supply additional active sites for Li collection, which improves the reversible capacity and shortens the Li+ and electron transport distances, improving the rate performance. • The NiO nanoparticles with a unique hexagonal crystal structure are ideal for ion cycling and embedding which can stabilize the structure and prevent the SnO 2 from becoming coarser. • The carbon material encapsulated in the outer layer can effectively prevent volume expansion during the cycle as well. A novel fluorine-doped porous SnO 2 -NiO@C-F (SNCF) composite anode material was synthesized by NaCl template method through high-energy ball milling and calcination under nitrogen atmosphere. This pore-like structure promotes electrolyte penetration as well as provides good intergranular electrical contact, which shortens the Li+ transport distance of electrons and F doping enhances the loading of SnO 2 -NiO particles on the surface of carbon materials and enhances electron transport and Li+ diffusion in the composite. In addition, NiO with relatively small content and distribution along the carbon substrate can improve the irreversible decomposition process of Li 2 O due to the catalytic properties of Ni-based oxides. The encapsulated carbon can buffer the volume expansion and avoid the accumulation of active materials, thus improving the material properties. Hence, the porous SnO 2 -NiO@C-F composite has a large capacity of 989.2 mAh g−1 after 150 cycles at 0.2 A g−1, as well as a long-time cycling stability that still shows a capacity of 768.9 mAh g−1 after 1000 cycles at 1 A g−1. In addition, it has excellent rate property, reaching a capacity of 389.0 mAh g−1 even at 5 A g−1. Therefore, the porous SnO 2 -NiO@C-F is a prospering anode material for lithium ion batteries (LIBs). [ABSTRACT FROM AUTHOR]

Dy-Bi co-doped yttrium tungstate crystal materials were synthesized by high temperature solid-state method. To reveal the photoluminescence features and properties of the samples, some measurements have been taken. It turned out that different Bi concentrations play obvious influence in emission performance, and show visible light emission under ultraviolet light excitation. Besides, the effect of temperature on phase structure of samples has also been studied here. Superhigh X-ray luminescence of the phosphors exhibited the promising application in the field of high energy detection. The X-ray irradiation crystal resistance stability of the phosphors has also been investigated through the subsequent testing of XRD and spectra. [ABSTRACT FROM AUTHOR]

Potassium ion batteries (PIBs) attract increasing attention due to abundant natural storage of potassium resources in the earth's crust, low cost, and high operating potential. However, larger radius of K+ compared to Na+/Li+, poor kinetics and unstable structure lead to inferior electrochemical performance for PIBs. Herein, we propose 3D fluorine-doped carbon@Ti 3 C 2 MXene (3D FC@Ti 3 C 2) composite as anode material for PIBs. In the composite, coating carbon can protect Ti 3 C 2 from oxidation and self-stack, fluorine-doped carbon can afford more defects and introduce numerous active site that can strongly adsorb K+. In addition, the composite can enlarge the interlayer spacing, and the 3D interconnected carbon framework can enhance conductivity and alleviate the volume expansion during cycling. Benefiting from these synergetic effects, the 3D FC@Ti 3 C 2 can obtain supernormal electrochemical property with high capacity of 288 mAhg−1 at 100 mAg−1 after 200 cycles and extraordinary cyclic stability of 174 mAhg−1 at 500 mAg−1 after 1000 cycles. • 3D FC@Ti 3 C 2 composite have been synthesized by freeze-drying and pyrolysis. • Carbon coating can protect Ti 3 C 2 from oxidation and self-stack. • Fluorine-doped carbon can strongly adsorb K+. • 3D interconnected carbon framework can enhance conductivity. [ABSTRACT FROM AUTHOR]

Sodium-ion batteries (SIBs) arouse researchers' interest gradually because of the scarcity of lithium sources. VSe 2 is one of the transition metal dichalcogenides (TMDs) equipped with a huge interlayer distance to accommodate more Na+ ions, but the problems such as agglomeration, volume deformation, dissolution loss and so on hinder its further development. Therefore, a VSe 2 /B 4 C@HCG composite was fabricated by the simple high-energy ball milling method. The B 4 C and VSe 2 nanoparticles are mixed and restrict each other, then anchor on the graphene, which alleviates agglomeration and volume deformation of VSe 2 during cycling processes effectively, and improves the overall environmental stability and conductivity. As a result, the VSe 2 /B 4 C@HCG composite delivers a reversible capacity of 407.5 mAh g−1 with the coulombic efficiency of 98.5% after 450 cycles, superior rate performance of 524.2, 476.3, 413.7, 353.7, and 295.3 mAh g−1 at the different current density of 100, 200, 500, 1000, and 2000 mA g−1, and ultrastable long-term cycling property of 251.6 mAh g−1 at the current density of 1 A g−1 after 1000 cycles, indicating the VSe 2 /B 4 C@HCG composite shows utilization potentiality to be used as an excellent anode material for SIBs. [Display omitted] • VSe 2 is equipped with huge interlayer space that can accommodate more Na+ ions. • The VSe 2 /B 4 C@HCG composite was synthesized by a simple ball-milling. • The component of B 4 C and high conductive graphene can effectively improve the overall environmental stability and conductivity of VSe 2 /B 4 C@HCG composite. • Stable cycling performance, excellent rate properties and electrochemical kinetics are presented. [ABSTRACT FROM AUTHOR]

Sodium-ion batteries (SIBs) arouse researchers' interest gradually because of the scarcity of lithium sources. VSe 2 is one of the transition metal dichalcogenides (TMDs) equipped with a huge interlayer distance to accommodate more Na+ ions, but the problems such as agglomeration, volume deformation, dissolution loss and so on hinder its further development. Therefore, a VSe 2 /B 4 C@HCG composite was fabricated by the simple high-energy ball milling method. The B 4 C and VSe 2 nanoparticles are mixed and restrict each other, then anchor on the graphene, which alleviates agglomeration and volume deformation of VSe 2 during cycling processes effectively, and improves the overall environmental stability and conductivity. As a result, the VSe 2 /B 4 C@HCG composite delivers a reversible capacity of 407.5 mAh g−1 with the coulombic efficiency of 98.5% after 450 cycles, superior rate performance of 524.2, 476.3, 413.7, 353.7, and 295.3 mAh g−1 at the different current density of 100, 200, 500, 1000, and 2000 mA g−1, and ultrastable long-term cycling property of 251.6 mAh g−1 at the current density of 1 A g−1 after 1000 cycles, indicating the VSe 2 /B 4 C@HCG composite shows utilization potentiality to be used as an excellent anode material for SIBs. [Display omitted] • VSe 2 is equipped with huge interlayer space that can accommodate more Na+ ions. • The VSe 2 /B 4 C@HCG composite was synthesized by a simple ball-milling. • The component of B 4 C and high conductive graphene can effectively improve the overall environmental stability and conductivity of VSe 2 /B 4 C@HCG composite. • Stable cycling performance, excellent rate properties and electrochemical kinetics are presented. [ABSTRACT FROM AUTHOR]

Potassium-ion and sodium-ion batteries (PIBs and SIBs) attract the attention of researchers because of their high earth abundance, low cost, and even similar principle to lithium-ion batteries. MOF-derived transition metal carbide composites are regarded as promising electrode materials because of their high specific capacity and excellent electrochemical activities while equipped with excellent sodiophilic for sodium nucleation and deposition. Therefore, Co 3 C/MXene@C composites with a large specific surface area are designed for both PIBs and SIBs. In detail, the Co 3 C component plays a key role in electrocatalysis of reversible conversion of some components of solid electrolyte interface films, while rich defective carbon and nitrogen content can improve the whole activity of the material. As results, the Co 3 C/MXene@C electrodes deliver an excellent reversible capacity of 236 mA h g−1 with the coulombic efficiency of 98.51% (for PIBs) and 275.9 mA h g−1 with the coulombic efficiency of 98.43% at 200 mA g−1 (for SIBs) after 100 cycles, superior rate performance of 80.6 mA h g−1 and 105 mA h g−1 at 2000 mA g−1 for PIBs and SIBs, respectively. With these outstanding electrochemical performances, the Co 3 C/MXene@C electrodes show a potential application prospect for potassium-ion and sodium-ion batteries. [Display omitted] [ABSTRACT FROM AUTHOR]

Ti 3 C 2 /TiO 2 /rGO nanosheets were synthesized as anode materials for potassium ion batteries (KIBs) using modified Hummers, freeze drying, and thermal reduction in this paper. Layered Ti 3 C 2 /TiO 2 /rGO nanosheets were synthesized by in-situ formation of rGO and TiO 2 nanoparticles between Ti 3 C 2 layers. As one of the most important members of MXenes family, Ti 3 C 2 exhibits unique electronic characteristics, high specific surface area, strong electrical conductivity and chemically active surface, which can enhance electrode capacity. There are three ways to increase electrode conductivity and capacity: Firstly, rGO is applied as the substrate for the inlaying of TiO 2 and Ti 3 C 2 nanoparticles and nanosheets. Secondly, rGO may also buffer electrode volume changes during charging and discharging processes. In addition, the enormous surface area of rGO makes Ti 3 C 2 and TiO 2 nanoparticles dispersion well, and Ti 3 C 2 and TiO 2 nanoparticles can well separate rGO nanoparticles and prevent them from stacking up again. The synergistic effect of the three can efficiently relieve the stress and provide a rapid transport pathway between electrons and ions. The flake structure of Ti 3 C 2 /TiO 2 /rGO is advantageous to the stability of SEI film, which makes the material maintain good activity during charge and discharge process, and significantly increases its electrochemical performance. Therefore, Ti 3 C 2 /TiO 2 /rGO electrode has a high reversible capacity of 349.2 mAhg−1 after 200 cycles of 100 mAg−1 current, and a high stable capacity of 229.3 mAhg−1 after 500 cycles of 500 mAg−1 current, and has exceptional rate performance. The structure of Ti 3 C 2 /TiO 2 /rGO composite remains stable after 500 cycles, and no agglomeration occurs. The detailed reaction mechanism of Ti 3 C 2 /TiO 2 /rGO electrode as KIBs anode was analyzed by SEM, XRD, Raman, TGA, FT-IR, BET, TEM, XPS, EDS, CV, EX-situ XRD, ex-situ TEM, and so on. Therefore, it can be concluded that the Ti 3 C 2 /TiO 2 /rGO composite is an appropriate anode material for KIBs. [Display omitted] • Ti 3 C 2 /TiO 2 /rGO nanosheets were synthesized using modified Hummers, freeze drying, and thermal reduction. • The flake structure of Ti 3 C 2 /TiO 2 /rGO is advantageous to the stability of SEI film, which makes the material maintain good activity. • RGO acts as a substrate for TiO 2 and Ti 3 C 2 nanoparticles to buffer the volume change of the electrode during the charging and discharging process. • The synergistic effect of Ti 3 C 2 , TiO 2 , and rGO can efficiently relieve the stress and provide a rapid transport pathway between electrons and ions. • Ti 3 C 2 /TiO 2 /rGO electrode has a high reversible capacity of 349.2 mAhg−1 after 200 cycles of 100 mAg−1 , and 229.3 mAhg−1 after 500 cycles of 500 mAg−1. [ABSTRACT FROM AUTHOR]

Supercapacitors have rapidly become an important electrochemical energy storage system due to their advantages such as fast power delivery, fast charging, and long cycle life, and play a dominant role in the field of high power transmission or absorption. Among various electrode materials, biomass carbon exhibits exciting electrochemical properties and impressive prospects owing to its wide availability, environmentally friendly renewability, and low-cost electricity storage. In this work, we report sulfur/nitrogen-doped biomass carbon with covalently grafted anthraquinone organic small molecules on its surface, derived from banana leaves (DAAQ-S/N-C-850). The prepared DAAQ-S/N-C-850 electrode material exhibits a high specific capacitance value of 355.3 F g−1 at a current density of 5 mV s−1 in three-electrode system. The experimental results show that the double doping of S and N can effectively improve the electrical conductivity of the electrode material, and the synergy between DAAQ organic molecules and double doping can availably improve the pseudocapacitive performance of the electrode material. Moreover, the asymmetric supercapacitor of DAAQ-S/N-C-850//CNT@RGO achieves energy density (30.9 Wh kg−1) and power density (0.714 kW kg−1) in 1 M H 2 SO 4 electrolyte. This article proposes functionalized S/N-doped biomass carbon and provides a novel method for the application of biomass carbon in the field of energy storage. [Display omitted] • S/N-doped porous carbon is prepared from banana tree leaves for supercapacitors. • DAAQ molecules are used as connecting bridges to link biomass carbons together. • graphene network is created through cross-linking reaction. • Heteroatoms and DAAQ organic small molecules achieve a significant synergy effect. [ABSTRACT FROM AUTHOR]

Highlights • An ultraviolet emitting ceramic substrate is synthesized using phosphors and kaolin. • Photons passing through the TiO 2 layers can be used to re-excite the TiO 2. • Photon utilization and thus the photocatalytic efficiency of TiO 2 are improved. Abstract Titanium dioxide (TiO 2) which could photocatalytically decompose organic pollutants in water, is deposited on an UV emitting substrate which is made from Ca 2 MgSi 2 O 7 :Ce3+ phosphors, for the purpose of better photon utilization and prevention of the suspension forming. The TiO 2 powder distributes homogeneously on the substrate, which could absorb the photons passing through the TiO 2 layer and generate a secondary emission with wavelength of 380 nm. This secondary emission could excite the TiO 2 again, and then promote the photocatalytic efficiency to organic dyes degradation because of the improvement of photon utilization. [ABSTRACT FROM AUTHOR]

Potassium-ion batteries (PIBs) receive intensive interest because of the natural abundance of potassium sources and their potency to achieve high energy density. VSe 2 is one of the promising electrode materials equipped with a huge interlayer distance, which can accommodate more K+ ions and reduce the structural distortion caused by the diffusion of K+ ions. But the problem of self-aggregation of VSe 2 hinder its further application. Therefore, taking advantage of excellent electrical conductivity and mechanical strength of MXene, VSe 2 /MXene@C composites with a hierarchical three-dimensional structure are designed. Especially, VSe 2 nanosheets are anchored on MXene substrates by strong covalent bonds, bridging with an oxygen atom. In addition, coating the carbon layer can avoid the deterioration of VSe 2 /MXene and improve the capacity and cycling stability of batteries effectively. As a result, the VSe 2 /MXene@C exhibits an excellent reversible capacity of 302.4 mAh g−1 with a coulombic efficiency of 99.49% at 200 mA g−1 after 200 cycles, long-term cycling performance of 138.7 mAh g−1 at 1 A g−1 after 500 cycles, and superior rate performance of 106.9 mAh g−1 at 2 A g−1. With outstanding electrochemical performance, the VSe 2 /MXene@C shows promise to become an excellent anode material for potassium-ion batteries(PIBs). [ABSTRACT FROM AUTHOR]

[Display omitted] • Simple hydrothermal and ball milling method were applied to synthesize SnO 2 -Nb-C ternary composite. • The carbon nanosheets accommodate volume variations around the cycle process and short the electrons and Li+ transport paths. • Niobium may accelerate the diffusion of Li+ and increase the number of oxygen holes. • Carbon nanosheets and niobium metal simultaneously improve the volume expansion of SnO 2 to achieve long-term stability of the electrode. A novel ternary SnO 2 -Nb-C composite, which consists of SnO 2 nanoparticles and a fraction of Niobium (Nb) embedded in flake carbon, is synthesized by hydrothermal and ball milling method. To be used as an anode material for lithium-ion batteries (LIBs), the SnO 2 -Nb-C composite is smoothly doped with n-type elements owing to the various valences of Nb, which enhances the electronic conductivity of the electrode, and effectively inhibits volume changes in SnO 2 during the cycle process, thus improving the electrode's electrochemical performance. Therefore, at 0.2 A g−1, the capacity is 956 mAh g−1 after 100 cycles, and the rate capacity is 1130.2 mAh g−1. Furthermore, at 1.0 A g−1, the specific discharge capacity is 1077.0 mAh g−1 after 500 cycles. According to the characterization results, the SnO 2 -Nb-C nanocomposite can be regarded as a potential anode material for LIBs. [ABSTRACT FROM AUTHOR]

Highlights: [•] Single Bi3+ and Dy3+ co-doped YBO3 phosphors at low temperature (900°C) are prepared. [•] The energy transfer from Bi3+ to Dy3+ is dependent on the concentration of Bi3+ ion. [•] The spectrum overlaying provides condition to the resonance energy transfer. [•] The luminescence of Bi3+ and Dy3+ co-doped YBO3 phosphors were reported. [ABSTRACT FROM AUTHOR]

[Display omitted] • Ternary SnO 2 -ZnO-C composite has been synthesized by hydrothermal and balling methods. • The ultrathin graphite nanosheet structure can facilitate lithium-ion transport. • ZnO can withstand high stress during cycling and stabilize the structure. • The ternary SnO 2 -ZnO-C composite can withstand high stress during cycling. • Ternary SnO 2 -ZnO-C composite shows high rate and cycling stability. SnO 2 -ZnO nanoparticles were wrapped in the ultrathin graphite network to synthesize SnO 2 -ZnO-C nanocomposite by the hydrothermal and ball milling methods. The SnO 2 -ZnO hybrid was uniformly dispersed in the graphite matrix. The ultrathin graphite in the composite alleviated the volume expansion during cycling, improved conductivity and shortened the transmission path of electrons and Li+. Therefore, the SnO 2 -ZnO-C composite shows intense invertible capacity of 1192.2 mAhg−1 after 300 cycles at 0.2 Ag−1 with high initial coulomb efficiency of 78.5% and stabilizes above 99.0% after four cycles, high-rate capacity of 723.6 mAhg−1 at 5.0 Ag−1, and long-term capacity of 596.3 mAhg−1 at 5.0 Ag−1 after 1000 cycles. Thanks to its outstanding properties, the SnO 2 -ZnO-C nanocomposite is a prospective anode material for next-generation lithium-ion batteries. [ABSTRACT FROM AUTHOR]

Dual-functional ZnWO4:Dy3+, Bi3+ were synthesized via high-temperature solid-state reaction method. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence spectra and photocatalytic properties. The ZnWO4:Dy3+, Bi3+ phosphor shows photoluminescence with a broad band and the feature Dy3+ emission, and a high photocatalytic activity in degradation of Rhodamine B (RhB) under simulated UV irradiation. The result shows that doping Bi3+ in ZnWO4:Dy3+ can enhance light harvest capability to generate more electron-hole pairs, and acted as a trap center by decreasing the recombination of photogenerated electrons and holes. All of the results obtained by the work suggest that ZnWO4:Dy3+, Bi3+ phosphors are promising materials for the photocatalytic decomposition of pollutants. [ABSTRACT FROM AUTHOR]