The zinc indium sulfide(ZnIn_(2)S_(4))semiconductors have garnered significant interest in photocatalysis due to their environmentally friendly characteristics,appropriate bandgap,and high absorption coefficient.Howev...The zinc indium sulfide(ZnIn_(2)S_(4))semiconductors have garnered significant interest in photocatalysis due to their environmentally friendly characteristics,appropriate bandgap,and high absorption coefficient.However,the exploration of advanced strategies to realize the effective and tailored doping still poses significant challenges in enhancing hydrogen evolution performance.In this work,a mild cation exchange strategy is reported to incorporate Ag cations into flower-like ZnIn_(2)S_(4) microspheres,enabling the selective replacement of Zn atoms by Ag.Remarkably,the as-fabricated Ag-ZnIn_(2)S_(4) exhibited exceptional photocatalytic hydrogen production performance,achieving a rate of 8098μmol·g^(−1)·h^(−1) under visible light irradiation.This is 4 times than that of pristine ZnIn_(2)S_(4)(2002μmol·g^(−1)·h^(−1)),and stands as the highest one among metal-doped-ZnIn_(2)S_(4) photocatalysts ever reported.Along with the theoretical calculations,it has been confirmed that the enhanced photocatalytic hydrogen generation behavior can primarily be attributed to the synergistic effect with improved light absorption,reduced adsorption energy,increased active sites and optimized charge carrier transfer,induced by the cation exchange with Ag in ZnIn_(2)S_(4).This work might provide some valuable insights on the design and development of highly efficient visible light driven photocatalysts for water splitting applications.展开更多
The Li3V2（PO4）3/C composite cathode material was synthesized via sol-gel method using three different chelating agents （citric acid, salicylic acid and polyacrylic acid） at pH value of 3 or 7. The crystal structur...The Li3V2（PO4）3/C composite cathode material was synthesized via sol-gel method using three different chelating agents （citric acid, salicylic acid and polyacrylic acid） at pH value of 3 or 7. The crystal structure, morphology, specific surface area and electrochemical performance of the prepared samples were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and galvanostatic charge/discharge test. The results show that the effects of pH value on the performance of the prepared materials are greatly related to the chelating agents. With salicylic acid or polyacrylic acid as the chelating reagent, the structure, morphology and electrochemical performance of the samples are greatly influenced by the pH values. However, the structure of the materials with citric acid as the chelating agent does not change as pH value changes, and the materials own uniform particle size distribution and good electrochemical performance. It delivers an initial discharge capacity of 113.58 mA·h/g at 10C, remaining as high as 108.48 mA·h/g after 900 cycles, with a capacity retention of 95.51%.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52272085 and 52372063)Zhejiang Provincial Natural Science Foundation of China(No.LY23E020002)+1 种基金Ningbo Youth Science and Technology Innovation Leading Talents Project(No.2023QL031)the Postdoctoral Fellowship Program of CPSF(No.GZC20233006).
文摘The zinc indium sulfide(ZnIn_(2)S_(4))semiconductors have garnered significant interest in photocatalysis due to their environmentally friendly characteristics,appropriate bandgap,and high absorption coefficient.However,the exploration of advanced strategies to realize the effective and tailored doping still poses significant challenges in enhancing hydrogen evolution performance.In this work,a mild cation exchange strategy is reported to incorporate Ag cations into flower-like ZnIn_(2)S_(4) microspheres,enabling the selective replacement of Zn atoms by Ag.Remarkably,the as-fabricated Ag-ZnIn_(2)S_(4) exhibited exceptional photocatalytic hydrogen production performance,achieving a rate of 8098μmol·g^(−1)·h^(−1) under visible light irradiation.This is 4 times than that of pristine ZnIn_(2)S_(4)(2002μmol·g^(−1)·h^(−1)),and stands as the highest one among metal-doped-ZnIn_(2)S_(4) photocatalysts ever reported.Along with the theoretical calculations,it has been confirmed that the enhanced photocatalytic hydrogen generation behavior can primarily be attributed to the synergistic effect with improved light absorption,reduced adsorption energy,increased active sites and optimized charge carrier transfer,induced by the cation exchange with Ag in ZnIn_(2)S_(4).This work might provide some valuable insights on the design and development of highly efficient visible light driven photocatalysts for water splitting applications.
基金supported by the Natural Science Youth Foundation of Jiangsu Province,China(BK20130198)Fundamental Research Funds for the Central Universities,China(2013XK07)~~
基金Project(2007BAQ01055)supported by the National Key Technology R&D Program of ChinaProject(2011SCU11081)supported by the Sichuan University Funds for Young Scientists,ChinaProject(20120181120103)supported by Ph.D.Programs Foundation of the Ministry of Education of China
文摘The Li3V2（PO4）3/C composite cathode material was synthesized via sol-gel method using three different chelating agents （citric acid, salicylic acid and polyacrylic acid） at pH value of 3 or 7. The crystal structure, morphology, specific surface area and electrochemical performance of the prepared samples were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and galvanostatic charge/discharge test. The results show that the effects of pH value on the performance of the prepared materials are greatly related to the chelating agents. With salicylic acid or polyacrylic acid as the chelating reagent, the structure, morphology and electrochemical performance of the samples are greatly influenced by the pH values. However, the structure of the materials with citric acid as the chelating agent does not change as pH value changes, and the materials own uniform particle size distribution and good electrochemical performance. It delivers an initial discharge capacity of 113.58 mA·h/g at 10C, remaining as high as 108.48 mA·h/g after 900 cycles, with a capacity retention of 95.51%.
