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The sluggish kinetics of complex redox reactions in the lithium–sulfur (Li–S) battery still hinders the fulfillment of its promising potential for next-generation energy storage devices. Herein, we introduce CoIn2S4-nanostructured particles assembled with nanosheets as the catalyst to boost the polysulfide conversion kinetics in the Li–S battery. This strategy enables the Li–S battery to achieve a high rate capacity of 686 mA h g−1 at 3C and allows it to be further applied in the pouch cell configuration with a total sulfur loading of 250 mg and E/S ratio of 5 μL mgS−1. The essential catalytic mechanism of the CoIn2S4 toward redox reactions is by targeting the rate-limiting process as concluded here from the electrochemical and in situ Raman studies, and as could be further evidenced by the theoretical analysis that indicated that the conversion barrier of short-chain polysulfides on the surface of CoIn2S4 is reduced and the charge transfer from CoIn2S4 to Li2S4 is enhanced due to the strong intermolecular polarization. The current work provides an insight into the catalytic mechanism focusing on the kinetics provided by in situ analysis, and demonstrates a new strategy for constructing highly practical Li–S batteries.

Eu3+ lanthanide ion possesses abundant 4f-4f transition lines in the visible spectral region, and its spectroscopic changes can sensitively reflect the variation of local ligand environments. Here, Eu3+ ions are successfully introduced into Ca4Al6SO16 lattice, and the structural difference from orthorhombic (o-Ca4Al6SO16) to cubic (c-Ca4Al6SO16) phases is systematically analyzed. On that basis, the related influence on crystal-field splitting of Eu3+ ions is discussed in detail. The obtained results indicate that Eu:o-Ca4Al6SO16 and Eu:c-Ca4Al6SO16 have three and two non-degenerate 5D0→7F0 transition peaks, respectively. Through the theoretical analysis and low-temperature (78 K) luminescent investigation with changing the excitation wavelength, those non-equivalent Ca2+ sites are assigned as o-Ca(1) (~577.6 nm), o-Ca(3) (~579.6 nm), o-Ca(4) (~580.6 nm), c-Ca(1) (~578.7 nm), and c-Ca(2) (~580.2 nm), respectively. In addition, with the increase of c-Ca4Al6SO16 content in the sintered product, the fluorescence intensity ratios of I580.6/I613.7, I616.2/I613.7 and I621/I613.7 present a gradual decreasing tendency. And, the introduction of c-Ca4Al6SO16 into the as-prepared product is beneficial for increasing the decay lifetime of the 5D0 excited state and enhancing the resistance capability to thermally induced fluorescence quenching. What discussed in this work might provide some useful thoughts for multi-phase studies and broaden the application range of lanthanide fluorescent probes.

High-specific-area host materials have been widely used in lithium-sulfur (Li–S) batteries to trap ploysulfides for high sulfur utilization and excellent operation stability. However, uncontrollable deposition of non-conductive Li2S on host materials tends to occur on the high-loading hosts, causing disastrous surface passivation during the long-term operation. One effective way to tackle this problem is to control the nucleation and growth of sulfur species during cycling by engineering the structure of electrodeposited insulating Li2S to generate open channels for charge transport. In this work, we report a rationally designed porous structure sulfur cathode with homogeneous sulfur loading by incorporating polyisoprene@sulfur into the interlayers of highly conductive Ti3C2Tx, in which the backbone of the polyisoprene and the interlayers of Ti3C2Tx support the porous structure sulfur species, and the unsaturated and functionalized bonds including C–C and C–O regulate the nucleation and heterogeneous growth of Li2S to prevent arbitrary Li2S accumulation on host surface. As a result, three-dimensional porous Li2S islands are achieved during discharge for free electron and ion transfer, thus effectively suppressing the surface passivation of the host. This conceptually novel design leads to remarkable improvement of the cycling performances with a capacity retention of 71% over 650 cycles. This report opens up an efficient avenue for controling the deposition of S/Li2S on the high-surface-area hosts to build high-performance Li–S batteries.

The aprotic lithium–oxygen (Li–O2) battery has triggered tremendous efforts for advanced energy storage due to the high energy density. However, realizing toroid-like Li2O2 deposition in low-donor-...

TiNb2O7 anode materials (TNO) have unique potential for applications in Li-ion capacitors (LICs) due to their high specific capacity of ca. 280 mA h g−1 over a wide anodic Li-insertion potential window. However, their high-rate capability is limited by their poor electronic and ionic conductivity. In particular, studies on TNO for LICs are lacking and that for flexible LICs have not yet been reported. Herein, a unique TNO porous electrode with cross-linked nanorods tailored by post-annealing and its application in flexible LICs are reported. This binder-free TNO anode exhibits superior rate performance (~66.3% capacity retention as the rate increases from 1 to 40 C), which is ascribed to the greatly shortened ion-diffusion length in TNO nanorods, facile electrolyte penetration and fast electron transport along the continuous single-crystalline nanorod network. Furthermore, the TNO anode shows an excellent cycling stability up to 2000 cycles and good flexibility (no capacity loss after continuous bending for 500 times). Model flexible LIC assembled with the TNO anode and activated carbon cathode exhibits increased gravimetric and volumetric energy/power densities (~100.6 W h kg−1/4108.8 W kg−1; 10.7 mW h cm−3/ 419.3 mW cm−3), more superior to previously reported hybrid supercapacitors. The device also efficiently powers an LED light upon 180° bending.

The growing demand for lithium batteries with higher energy densities requires new electrode chemistries. Lithium metal is a promising candidate as the anode material due to its high theoretical specific capacity, negative electrochemical potential and favorable density. However, during cycling, low and uneven lithium ion concentration on the surface of anode usually results in uncontrolled dendrite growth, especially at high current densities. Here we tackle this issue by using lithiophilic montmorillonite as an additive in the ether-based electrolyte to regulate the lithium ion concentration on the anode surface and thus facilitate the uniform lithium deposition. The lithiophilic montmorillonite demonstrates a pumping feature that improves the self-concentrating kinetics of the lithium ion and thus accelerates the lithium ion transfer at the deposition/electrolyte interface. The signal intensity of TFSI− shows negligible changes via in situ Raman tracking of the ion flux at the electrochemical interface, indicating homogeneous ion distribution, which can lead to a stable and uniform lithium deposition on the anode surface. Our study indicates that the interfacial engineering induced by the lithiophilic montmorillonite could be a promising strategy to optimize the lithium deposition for next-generation lithium metal batteries., The address one of the major challenges facing the lithium metal anode, here the authors use lithiophilic montmorillonite as an additive to the ether-based electrolyte to regulate the lithium ion concentration on the anode surface, facilitating uniform lithium deposition.

Due to the flexibility and excellent electrochemical properties, carbon nanofibers have been proposed as promising anode material for lithium ion batteries. In this paper, through in-situ reduction of C/CuO/rGO after electrospinning to form abundant active sites at carbon nanofibers, a novel C/Cu/rGO anode is prepared. The C/Cu/rGO anode owns a capacity of ∼400 mAh/g at 1 A/g after 600 cycles, a value well above those of C and C/rGO (

With unique 2D nanostructures and excellent properties, graphene and its derivatives are a class of advanced nanosized reinforcements for cementitious materials. Sulfonated graphene (SG), one of the most important modified graphene materials, possesses sulfonate groups on the surface and significantly improves the mechanical and thermal properties of cement-based composites. It is important to investigate the influence of SG on cement-based materials as it is a prerequisite for practical applications. Herein, SG was prepared and introduced into cement paste to investigate its influence on the rheological properties of cement paste. With the increased addition of SG, a stable slurry was gradually obtained with low fluidity and high rheological parameters. The mechanism of the SG effect on the rheological properties of cement paste was also illustrated. Because of the high specific surface area and sulfonate groups of SG nanosheets, a large amount of flocculated structure was created by the complexing effect, chemical interaction, physical interaction and mechanical interlocking between SG and hydrated/unhydrated cement particles. Furthermore, polycarboxylate ether (PCE) superplasticizer was introduced to ensure fluidity and transportability in the practical application of SG. The results in this work lay a foundation for the practical application of modified graphene in cementitious materials.

The rechargeable lithium-sulfur battery is recognized as a next-generation lithium-ion battery due to its exceptionally high energy density and low cost. Unfortunately, the high dissolution of polysulfides and the low conductivity of sulfur and lithium sulfide lead to a fast capacity decay and a poor specific capacity of the sulfur cathode, which impedes the further development of lithium-sulfur batteries. To overcome these issues, we propose a 3D binder-free collector via in situ-grown polar TiO2 nanowires on carbon-nanofibers, which can successfully suppress the “shuttle effect” of polysulfides and improve the electron conductivity of the sulfur cathode. The prepared TiO2-nanowires arrays provide a large surface area for sulfur loading and a convenient path for electron transfer. These characteristics result in a high ion diffusion capacity of up to 699 mA h g−1 with an excellent coulombic efficiency, higher than 98.5% after 300 cycles at 1.0 C, and a capacity decay as low as 0.075% per cycle. In addition, the strong chemical binding interaction between the polysulfides and TiO2 was directly observed by in situ UV/Vis spectroscopy.

Strontium sulfoaluminate (Sr4Al6O12SO4 or S4A3$) is a polymorph that exists at low and high temperatures and presents a reversible phase-change phenomenon. In this paper, Ga3+ ions are successfully incorporated into Al3+ site of the S4A3$ structure, and the phase transformation mechanism from Pcc2 to I23 as well as the related influence on the crystal-field splitting of Eu3+ ions of the two phases are studied. Experimental results reveal that the addition of Ga3+ ions facilitates the transformation from Pcc2 to I23, and the metastable I23 phase is successfully reserved at low temperature for Ga3+-doped content above 20 at%. Structural information, DSC, SEM-EDS, and structural disorder in infrared spectra further verify the phenomenon. Moreover, Eu3+ ions emission intensity of c-S4A3$ phase in fluorescence spectra is much more intense than that of o-S4A3$ phase with a complex spectral distribution. That is to say, the incorporation of Eu3+ ions mainly influences the crystal-field splitting of Pcc2 and I23 phases.

High-polluting industrial ammonia synthesis runs counter to the intentions of a low-carbon society. In contrast, the electrocatalytic nitrogen reduction reaction (NRR) is expected to provide fascinating and broad prospects for green ammonia synthesis, which urgently requires efficient and low-cost catalysts. Although it has been proven that two-dimensional (2D) transition metal carbides and carbonitrides (MXenes) have great potential for NRR, there is still need to further improve their activity. In this work, a co-doping strategy was employed to design the electronic configuration and structural mechanic of Ti3C2Tx catalysts for efficient NRR. As expected, the synergistic effect of N and S dopants in Ti3C2Tx (NS-Ti3C2Tx) significantly improves the electron/ion transport capacity and increases the catalytic active sites. Specifically, the as-prepared NS-Ti3C2Tx nanosheets demonstrated an excellent electrocatalytic stability with NH3 yield of 34.23 μg h−1 mg−1cat at −0.55 V vs. RHE, and a Faraday efficiency of 6.6% in 0.05 M H2SO4. Therefore, this work opens up a new research approach for preparing high-performance catalysts for energy storage applications through efficient nitrogen fixation technology.

Bismuth ferrite thin films were prepared by sol–gel method and spin-coating technique. The effects of annealing atmosphere (air and oxygen) on the microstructure, dielectric, ferroelectric properties and domain structure of bismuth ferrite thin films have been studied systematically. The XRD and AFM results indicate that the bismuth ferrite thin films annealed in air and oxygen atmosphere are rhombohedral perovskite structure and bismuth ferrite thin films annealed in oxygen atmosphere have higher purity, better thickness uniformity and smoothness, and slightly larger grain size than that of the sample annealed in air. Bismuth ferrite annealed in oxygen atmosphere have higher dielectric constant, lower dielectric loss and much higher remnant polarization than that of the thin films annealed in air. The PFM (Piezoelectric Force Microscopy) results indicate that there are coexistence of single domain and polydomain state grains in bismuth ferrite annealed in air and oxygen atmosphere, and the single domain critical size is 80–100 and 100–110 nm respectively. Moreover, there are non-neutral domain wall (negatively charged “tail to tail” and positively charged “head to head” domain wall) in bismuth ferrite thin films annealed in air and oxygen atmosphere.

2D planar structures of nonlayered wide-bandgap semiconductors enable distinguished electronic properties, desirable short wavelength emission, and facile construction of 2D heterojunction without lattice match. However, the growth of ultrathin 2D nonlayered materials is limited by their strong covalent bonded nature. Herein, the synthesis of ultrathin 2D nonlayered CuBr nanosheets with a thickness of about 0.91 nm and an edge size of 45 µm via a controllable self-confined chemical vapor deposition method is described. The enhanced spin-triplet exciton (Zf , 2.98 eV) luminescence and polarization-enhanced second-harmonic generation based on the 2D CuBr flakes demonstrate the potential of short-wavelength luminescent applications. Solar-blind and self-driven ultraviolet (UV) photodetectors based on the as-synthesized 2D CuBr flakes exhibit a high photoresponsivity of 3.17 A W-1 , an external quantum efficiency of 1126%, and a detectivity (D*) of 1.4 × 1011 Jones, accompanied by a fast rise time of 32 ms and a decay time of 48 ms. The unique nonlayered structure and novel optical properties of the 2D CuBr flakes, together with their controllable growth, make them a highly promising candidate for future applications in short-wavelength light-emitting devices, nonlinear optical devices, and UV photodetectors.

In this work, the electronic structure modulation of ScOOH is proposed, and the density functional theory (DFT) calculations indicate the introduction of oxygen vacancies (VO) in ScOOH could generate the defect-related energy levels within the band gap. The following photoluminescence and chemical state analyses verify the existence of VO in the two ScOOH phases, and the temperature-dependent fluorescence investigation further confirms the thermal sensitivity of VO-related emissions. On that basis, a self-calibration temperature sensing strategy is demonstrated with a combination of the emissions of VO defects and lanthanide luminescent probes (Eu3+ and Tb3+), yielding a relative sensitivity of 1.33%·K-1 (173 K). The findings in this work lay a foundation for developing LnOOH materials by the electronic structure modulation and further broaden the relevant optoelectronic applications.

Owing to the high specific capacity and lowest negative electrochemical potential, lithium metal as assembled with cathode materials such as sulfur, oxygen and so forth is regarded as a promising candidate for next-generation energy storage. However, the uncontrollable deposition of lithium ions (Li-ions) on anode surface tends to cause a disastrous surface passivation or soft short of battery during the long-term operation. One effective way to tackle this problem is controlling the nucleation and growth of lithium deposition by avoiding the formation of Li-ions barren areas near the electrode. In this work, a ferroelectric decoration layer of BiFeO3 (BFO) nanoparticles with low energy barrier for Li-ion diffusion on commercial separator is applied to construct polarization field to accelerate the Li-ion migratory, which can effectively eliminate the barren areas of Li-ions near the surface of anode. The strong interfacial polarization between the BFO and Li-ions leads to a dense and smooth nucleation of lithium deposition, resulting in a long-term stability of lithium plating/stripping even at a low temperature of −10 °C in which the cells with BFO separator could deliver high Coulombic efficiency (CE) of 95 % at the current density of 0.5 mA cm−2 for 180cycles. Moreover, with high sulfur loading of 1000 mg/pouch cell, the Li–S pouch cell with BFO/PP separator could deliver specific capacity as high as 1408 mA h g−1 with 0.14% capacity decay per cycle even over 150 cycles. Our study demonstrates that BFO/PP separator can serve as the Li-ion booster to facilitate uniform lithium deposition to build highly-practical Li metal batteries.

Lithium–sulfur battery is one of the most promising candidates to take over from the conventional lithium-ion batteries for the next-generation high energy storage devices. Although plausible advances have been made on the performances of the composite cathode with high sulfur loading, the development of compatible protection strategies for lithium anode is seriously lagging behind. Here we report a new strategy to suppress the dendrite growth in lithium-sulfur batteries with high sulfur loading by introducing graphene quantum dots into the electrolyte. The graphene quantum dots serve as the heterogeneous sites for uniform nucleation and provide continual regulation for the dendrite-free lithium deposition. The in-situ Raman spectroscopy reveals the enrichment of the GQDs at the electrode-electrolyte interface for the regulated electric field and ion flux, resulting in the dendrite-free Li deposition. As a result, the critical current of short circuit induced by lithium dendrite increases up to 7.44 mA cm−2, and the soft-short risk is excluded when cycling at the current density of 3 mA cm−2 with areal capacity of 3 mAh cm−2 for more than 500 h, demonstrating the excellent dendrite suppressing action of the GQDs. As a proof of concept, high-loading lithium-sulfur batteries using the GQDs-modified anolyte are fabricated with stable Coulombic efficiency of 99% at the current density of 3 mA cm−2 with sulfur loading of 4 mg cm−2 over 200 cycles. Our results provide a novel and facile approach to tackle the intrinsic problem on the lithium anode for high-loading lithium-sulfur batteries.

Fast lithium ion transport with a high current density is critical for thick sulfur cathodes, stemming mainly from the difficulties in creating effective lithium ion pathways in high sulfur content electrodes. To develop a high-rate cathode for lithium-sulfur (Li-S) batteries, extenuation of the lithium ion diffusion barrier in thick electrodes is potentially straightforward. Here, a phyllosilicate material with a large interlamellar distance is demonstrated in high-rate cathodes as high sulfur loading. The interlayer space (≈1.396 nm) incorporated into a low lithium ion diffusion barrier (0.155 eV) significantly facilitates lithium ion diffusion within the entire sulfur cathode, and gives rise to remarkable nearly sulfur loading-independent cell performances. When combined with 80% sulfur contents, the electrodes achieve a high capacity of 865 mAh g-1 at 1 mA cm-2 and a retention of 345 mAh g-1 at a high discharging/charging rate of 15 mA cm-2 , with a sulfur loading up to 4 mg. This strategy represents a major advance in high-rate Li-S batteries via the construction of fast ions transfer paths toward real-life applications, and contributes to the research community for the fundamental mechanism study of loading-independent electrode systems.

With the continuous exploration of 2D transition metal dichalcogenides (TMDs), novel high‐performance devices based on the remarkable electronic and optoelectronic natures of 2D TMDs are increasingly emerging. As fresh blood of 2D TMD family, anisotropic MTe2 and ReX2 (M = Mo, W, and X = S, Se) have drawn increasing attention owing to their low‐symmetry structures and charming properties of mechanics, electronics, and optoelectronics, which are suitable for the applications of field‐effect transistors (FETs), photodetectors, thermoelectric and piezoelectric applications, especially catering to anisotropic devices. Herein, a comprehensive review is introduced, concentrating on their recent progresses and various applications in recent years. First, the crystalline structure and the origin of the strong anisotropy characterized by various techniques are discussed. Specifically, the preparation of these 2D materials is presented and various growth methods are summarized. Then, high‐performance applications of these anisotropic TMDs, including FETs, photodetectors, and thermoelectric and piezoelectric applications are discussed. Finally, the conclusion and outlook of these applications are proposed.

The exploration of localized surface plasmon resonance (LSPR) beyond the usual visible waveband, for example within the ultraviolet (UV) or deep-ultraviolet (D-UV) regions, is of great significance due to its unique applications in secret communications and optics. However, it is still challenging to universally synthesize the corresponding metal nanostructures due to their high activity. Herein, we report a universal, eco-friendly, facile and rapid synthesis of various nano-metals encapsulated by ultrathin carbon shells, significantly with a remarkable deep-UV LSPR characteristic, via a liquid-phase laser fabrication method. Firstly, a new generation of the laser ablation in liquid (LAL) method has been developed with an emphasis on the elaborate selection of solvents to generate ultrathin carbon shells, and hence to stabilize the formed metal nanocrystals. As a result, a series of metal@carbon nanoparticles (NPs), including Cr@C, Ti@C, Fe@C, V@C, Al@C, Sn@C, Mn@C and Pd@C, can be fabricated by this modified LAL method. Interestingly, these NPs exhibit LSPR peaks in the range of 200–330 nm, which are very rare for localized surface plasmon resonance. Consequently, the UV plasmonic effects of these metal@carbon NPs were demonstrated both by the observed enhancement in UV photoluminescence (PL) from the carbon nanoshells and by the improvement of the photo-responsivity of UV GaN photodetectors. This work could provide a universal method for carbon shelled metal NPs and expand plasmonics into the D-UV waveband.

Summary Lithium-sulfur (Li-S) batteries are of considerable interest for high-density energy storage. However, the adoption of Li-S batteries to date has been severely plagued by the polysulfide shuttling effect, whereby polysulfide molecules dissolve into the electrolyte and shuttle across the separator to react with the anode materials, leading to a rapidly fading capacity. Herein, by directly coating a thin layer of reduced graphene oxide (rGO)/sodium lignosulfonate (SL) composite on the standard polypropylene (PP) separator, we produce a rGO@SL/PP separator with abundant negatively charged sulfonic groups in the porous lignin network, which effectively suppress the translocation of the negatively charged polysulfide (PS) ions without compromising the transport of positively charged Li+ ions. Using the rGO@SL/PP separator, we demonstrate a highly robust Li-S battery with a capacity retention of 74% over 1,000 cycles. This study defines an effective strategy to inhibit the PS shuttling effect for highly robust Li-S batteries.

Cu nanocrystals of various shapes are synthesized via a universal, eco-friendly, and facile colloidal method on Al substrates using hexadecylamine (HDA) as a capping agent and glucose as a reductant. By tuning the concentration of the capping agent, hierarchical 3D Cu nanocrystals show pronounced surface-enhanced Raman scattering (SERS) through the concentrated hot spots at the sharp tips and gaps due to the unique 3D structure and the resulting plasmonic couplings. Intriguingly, 3D sword-shaped Cu crystals have the highest enhancement factor (EF) because of their relatively uniform size distribution and alignment. This work opens new pathways for efficiently realizing morphology control for Cu nanocrystals as highly efficient SERS platforms.

High-performance electrocatalysts are desired for electrochemical energy conversion, especially in the field of water splitting. Here, a new member of phosphate electrocatalysts, nickel metaphosphate (Ni2 P4 O12 ) nanocrystals, is reported, exhibiting low overpotential of 270 mV to generate the current density of 10 mA cm-2 and a superior catalytic durability of 100 h. It is worth noting that Ni2 P4 O12 electrocatalyst has remarkable oxygen evolution performance operating in basic media. Further experimental and theoretical analyses demonstrate that N dopant boosts the catalytic performance of Ni2 P4 O12 due to optimizing the surface electronic structure for better charge transfer and decreasing the adsorption energy for the oxygenic intermediates.

Organic hybrid supercapacitors that consist of a battery electrode and a capacitive electrode show greatly improved energy density, but their power density is generally limited by the poor rate capability of battery-type electrodes. In addition, flexible organic hybrid supercapacitors are rarely reported. To address the above issues, herein an in-plane assembled orthorhombic Nb2O5 nanorod film anode with high-rate Li+ intercalation to develop a flexible Li-ion hybrid capacitor (LIC) is reported. The binder-/additive-free film exhibits excellent rate capability (≈73% capacity retention with the rate increased from 0.5 to 20 C) and good cycling stability (>2500 times). Kinetic analyses reveal that the high rate performance is mainly attributed to the excellent in-plane assembly of interconnected single-crystalline Nb2O5 nanorods on the current collector, ensuring fast electron transport, facile Li-ion migration in the porous film, and greatly reduced ion-diffusion length. Using such a Nb2O5 film as anode and commercial activated carbon as cathode, a flexible LIC is designed. It delivers both high gravimetric and high volumetric energy/power densities (≈95.55 Wh kg−1/5350.9 W kg−1; 6.7 mW h cm−3/374.63 mW cm−3), surpassing previous typical Li-intercalation electrode-based LICs. Furthermore, this LIC device still keeps good electrochemical attributes even under serious bending states (30°–180°).

The rechargeable lithium-sulfur battery is recognized as a promising candidate for electrochemical energy storage system because of their exceptional advance in energy density. However, the fast capacity decay of sulfur cathode caused by polysulfide dissolution and low specific capacity caused by poor electrical conductivity still impede the further development of lithium-sulfur battery. To address above issues, this study reports the synthesis of feather duster-like TiO2 architecture by in situ growth of TiO2 nanowires on carbon cloth and further evaluates as sulfur host material. The strong chemical binding interaction between the polysulfides and TiO2 feather duster efficiently restrains the shuttle effect, leading to enhanced electrochemical kinetics. Besides, the in situ grown TiO2 NWs array also supply high surface for sulfur-loading and fast path for electron transfer and ion diffusion. As results, the novel CC/TiO2 /S composite cathode exhibits a high capacity of 608 mA h g-1 at 1.0 C after 700 cycles corresponding to capacity decay as low as 0.045% per cycle with excellent Coulombic efficiency higher than 99.5%.

Flexible perovskite photodetectors are usually constructed on indium-tin-oxide-coated polymer substrates, which are expensive, fragile, and not resistant to high temperature. Herein, for the first time, a high-performance flexible perovskite photodetector is fabricated based on low-cost carbon cloth via a facile solution processable strategy. In this device, perovskite microcrystal and Spiro-OMeTAD (hole transporting material) blended film act as active materials for light detection, and carbon cloth serves as both a flexible substrate and a conductive electrode. The as-fabricated photodetector shows a broad spectrum response from ultraviolet to near-infrared light, high responsivity, fast response speed, long-term stability, and self-powered capability. Flexible devices show negligible degradation after several tens of bending cycles and at the extremely bending angle of 180°. This work promises a new technique to construct flexible, high-performance photodetectors with low cost and self-powered capability.

CuO and Cu2O are non-noble transition metal oxide supercapacitive materials with high theoretical specific capacitances above 1800 F g−1. In this work, by adjusting organic additives of a colloidal system, Cu, Cu2O, and CuO are grown in situ on nickel foam. CuO exhibits a specific capacitance of 1355 F g−1 at 2 A g−1 in 3 m KOH, a value well above those of Cu and Cu2O (

Interface enhanced magnetism attracts much attention due to its potential use in exploring novel structure devices. Nevertheless, the magnetic behavior at interfaces has not been quantitatively determined. In this study, abnormal magnetic moment reduction is observed in La0.7 Sr0.3 MnO3 (LSMO)/BiFeO3 (BFO) superlattices, which is induced by ferromagnetic (FM)/antiferromagnetic (AFM) coupling in the interface. With reduced repetition of the superlattice's unit cell [(LSMO)n /(BFO)n ]60/n (n = 1, 2, 5, 10) on a SrTiO3 substrate, magnetic moment reduction from 25.5 emu cc-1 ([(LSMO)10 /(BFO)10 ]6 ) to 1.5 emu cc-1 ([(LSMO)1 /(BFO)1 ]60 ) is obtained. Ab initio simulations show that due to the different magnetic domain formation energies, the magnetic moment orientation tends to be paramagnetic in the FM/AFM interface. The work focuses on the magnetic domain formation energy and provides a pathway to construct artificial heterostructures that can be an effective way to tune the magnetic moment orientation and control the magnetization of ultrathin films.