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In this work, thermo-responsive PNIPAM@AgBr/CSs composite photocatalysts were successfully fabricated by grafting method. The thermo-responsive composite photocatalysts were further characterized by SEM, EDS, XRD, FT-IR, DRS and PL, the results demonstrated that the surface of CSs was successfully loaded with AgBr and further grafted with PNIPAM, and the grafted PNIPAM not only obtained the thermo-responsive performance, but also synergistically enhanced visible light photocatalytic activity toward degradation of tetracycline (TC) antibiotics. The influenced factors of photocatalytic degradation were also investigated, the results showed that the dosage of PNIPAM and the reacted temperature were obviously affected the degradation rate of TC. Lastly, the photocatalytic degradation mechanism of as-obtained thermo-sensitive photocatalyst was also discussed in detail. This work might offer a way to obtain the intelligently composite materials for switchable photocatalytic processes. [ABSTRACT FROM AUTHOR]

• The ternary metal NiCoGa-LDHs is firstly synthesized by simple hydrothermal method. • The morphology, crystal structure stability and capacitance of NiCoGa-LDHs are systematically studied. • The Ni 1 Co 3 Ga 1 -LDHs@CC electrode exhibits excellent capacitance of 2012.5 F g-1 at 1 A g-1. • The asymmetric supercapacitor (84.22 Wh kg-1) can light multiple LEDs in parallel. Ternary metal layered double hydroxides (LDHs) have been widely used in supercapacitors (SCs) due to their polyvalent state and high electrochemical activity. In this study, Ga (III) doped NiCo layered double hydroxides (NiCoGa-LDHs) electrode material is prepared on carbon cloth (CC) by simple one-step hydrothermal method for the first time. The effects of Ga3+ with different molar ratios on the structure, morphology, crystallinity, ion transport mechanics and electrochemical properties of ternary LDHs electrode materials are systematically investigated. At Ga3+ = 1.0, the as-synthesized Ni 1 Co 3 Ga 1 -LDHs@CC exhibits a special electrochemical capacitance of 2012.5 F g-1 at 1 A g-1 with 57.7% capacitance retention observed at 5.0 A g-1. The synthesis and evaluation of the two bimetallic NiCo-LDHs and NiGa-LDHs are similar in order to demonstrate the performance improvement of gallium heterovalent substitution. And heterovalent substitution of gallium for cobalt ion and nickel ion is proved indirectly. An Asymmetric supercapacitors (ASCs) device is assembled with Ni 1 Co 3 Ga 1 -LDHs@CC as anode and mesoporous carbon (MPC) as cathode, providing a high energy density of 84.22 Wh kg-1 at a power density of 800.1 W kg-1, with excellent cyclic stability. This study provides a new way to improve the electrochemical performance and stability of ternary metal LDHs. [ABSTRACT FROM AUTHOR]

The interfacial regulation strategy between semiconductors can effectively promote the separation efficiency of photogenerated carriers and enhance photocatalytic activity under the synergistic effect. Herein, AgInS 2 QDs-MoS 2 /GO (AIS-MS/GO) composites were prepared by interfacial coupling of AgInS 2 QDs (AIS), hierarchical MoS 2 and ultrathin GO. Ultrathin GO successfully solved the agglomeration problem of AIS and hierarchical MoS 2. Moreover, the photogenerated carriers were effectively separated and transferred under the synergistic effect of the AIS-MS heterojunction and ultrathin GO, thus promoting tetracycline (TC) degradation and CO 2 reduction performance. The degradation rate of tetracycline (TC) reached 96.5 %, and the yields of CO and CH 4 in the CO 2 reduction products reached 52.6 and 28.5 μmol g–1, respectively, when using the optimized photocatalyst. In-situ FTIR analysis indicated that TC is gradually degraded by small molecules on the composite surface, and has excellent dissociation ability of water molecules during the CO 2 reduction process. This work provides a new vision for the rational design of heterojunction-based photocatalysts using the interfacial regulation strategy for enhancing interfacial charge separation and photocatalytic performance. [Display omitted] • AIS-MS/GO composites were prepared via the interfacial regulation strategy. • The photogenerated carriers were effectively separated and transferred under synergistic and interfacial effects. • The aggregation problem of AIS and hierarchical MoS 2 was effectively solved. • AIS-MS/GO composites achieve a 96.5 % TC degradation rate and 35.1 % selectivity for CH 4. [ABSTRACT FROM AUTHOR]

Abstract Supercapacitor is a new energy storage device between traditional capacitor and rechargeable battery. Not only has the characteristics of fast charging and discharging of capacitor, but also has the characteristics of energy storage of battery. The electrochemical tests indicate that the electrode in view of porous Ni 2 P 2 O 7 nanowires (NWs) has a specific capacitance of 772.5 Fg-1 at current density 1 Ag-1. Furthermore, porous Ni 2 P 2 O 7 NWs have been successfully applied to construct all-solid hybrid supercapacitors. Carbon nanotubes (CNT) and easily treated nickel pyrophosphate (Ni 2 P 2 O 7) are considered as electrode materials for supercapacitors under alkaline conditions. The equipment has a high energy density of 6.25 mWh cm−2 and good cycle stability of 94% capacitance retention after 3000 cycles, which identifies that porous Ni 2 P 2 O 7 nanowires are promising supercapacitor active materials. Highlights • A novel intercalated porous Ni 2 P 2 O 7 nanowires was prepared by simple chemical precipitation method. • The intercalated porous Ni 2 P 2 O 7 nanowires as new electrode materials exhibited great electrochemical properties. • Ni 2 P 2 O 7 //CNT ASC device is a promising material for fiber supercapacitors and electronic applications. [ABSTRACT FROM AUTHOR]

Abstract The development of highly efficient and long-term durable electrocatalyst for oxygen evolution reaction is still a great challenge to attain renewable and clean energy. Herein, CoSe 2 @N-Doped-carbon-nanorods named as CoSe 2 @NC nanorods have been conveniently synthesized by in-situ selenization of a novel N-doped metal organic frameworks under N 2 atmosphere. CoSe 2 @NC nanorods show highly efficient electrocatalytic performance for oxygen evolution reaction at a low overpotential of 310 mV for 10 mA cm−2 current density in 1.0 M KOH aqueous solution, which are comparable to the state-of-the-art RuO 2 and IrO 2 catalysts. The remarkable electrocatalytic performance can be attributed to the unique N-doped MOFs derived well-defined architecture with large active surface area, high conductivity of carbon and well-distributed active sites. In addition, CoSe 2 @NC nanorods exhibit long-term stability without obvious decay after 1000 cyclic voltammetry cycles. Graphical abstract Image 1 Highlights • N-doped MOFs-derived CoSe 2 @NC nanorods was synthesized. • The samples have high conductivity of carbon and well-distributed active sites. • The samples show highly efficient electrocatalytic performance for OER. [ABSTRACT FROM AUTHOR]

The unique three-dimensional (3D) porous structure of graphite carbon nitride (g-C 3 N 4) and vanadium pentoxide (V 2 O 5) was prepared by an environmentally friendly one-step solvothermal method, and its electrochemical performance was assessed. Importantly, g-C 3 N 4 is a low cost material with excellent chemical stability, and it supports the vertical charge transfer during the charge-discharge process, which promotes electronic transmission along this direction. In addition, V 2 O 5 has good theoretical capacitance and is deemed as a potential electrode material for next-generation supercapacitors. Field emission scanning electron microscopy of the nanocomposite revealed a 3D porous morphology for g-C 3 N 4 (3D PCN) and a spherical morphology for V 2 O 5. This study estimated the viability of the graphite carbon nitride-based nanocomposite PCN@V 2 O 5 as a new catalyst in the supercapacitor (SC) anodes. A series of SC anodes with different catalyst loadings were produced. The electrochemical behavior of the SC anodes was calculated by cyclic voltammetry (CV), charge-discharge and cycling test. When test in electrochemical performance, the ratio of PCN:V 2 O 5 is lower than 1:1 and 3D PCN@V 2 O 5 exhibits a lower specific capacity, the ratio of PCN:V 2 O 5 is higher than 1:1 that most of the pores in 3D porous g-C 3 N 4 are covered that reduces the electron transport rate and results in a lower specific capacity. Overall, 3D PCN@V 2 O 5 has higher specific capacity (457 Fg-1 at 0.5 Ag-1) and better cycling performance (approximately 84% after 500 cycles). This attractive performance indicates that 3D PCN@V 2 O 5 could be used as potential electrode materials for supercapacitors. • A novel 3D porous PCN@V 2 O 5 was prepared by simple chemical precipitation method. • The 3D porous PCN@V 2 O 5 as new electrode materials exhibited great electrochemical properties. • The 3D porous PCN@V 2 O 5 products are potential supercapacitor electrode materials for supercapacitors. [ABSTRACT FROM AUTHOR]