Rapid charge carrier recombination rate and insufficient light harvesting capacity are two dominat-ing drawbacks encountered in zinc indium sulfide(Znln2S4)for photocatalytic applications.Herein,a chemical reduction method was performed to combine bimetallic Ag-Pd alloy nanoparticles(NPs)with spherical-like Znln2S4(ZIS).By optimizing Ag:Pd molar ratio and overall loading amount,the optimal Ag0.25Pd0.75-ZIS sample exhibited a maximum H2 evolution rate(125.4 pmol/h)under visible light,which was higher than that of ZIS,Ag-ZIS and Pd-ZIS.The loading of Ag NPs contribution to PHE reaction by its plasmonic effect was negligible compared to that of Pd loading(Schottky effect).The apparent quan-tum yield(AQY)values over Ag0.25Pd0.75-ZIS sample could reach up to 18.3％at 400 nm and 15.8％at 420 nm.The enhanced activity for photocatalytic hydrogen evolution(PHE)over Ag0.25Pd0.75-ZIS sample was mainly due to the bimetallic synergistic effect that presented as follows.Firstly,the plasmon hy-bridization by loading Ag-Pd bimetallic alloy can significantly increase light harvesting capacity of ZIS.Secondly,the optimal Schottky barrier height formed between Ag-Pd alloy and ZIS interface was benefi-cial for prolonging electron-hole pair lifetimes,promoting charge carrier separation and thus facilitating PHE efficiency.Density functional theory(DFT)analysis indicated that the adsorption energy of H*over Pd0.75Ag0.25 alloy was very close to zero and thus theoretically possessed the highest activity for H2 evo-lution,which is in line with experimental results.Combined theoretical calculation with experimental results,a reasonable photocatalytic mechanism was proposed and verified.

Chao Liu;Yulong Zhang;Jiaxin Wu;Hailu Dai;Chengjian Ma;Qinfang Zhang;Zhigang Zou

School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China;Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology,Yancheng 224051,China;Analytical and Testing Center,Yancheng Institute of Technology,Yancheng 224051,China;Eco-Materials and Renewable Energy Research Centre(ERERC),Nanjing University,Nanjing 210093,China

材料科学技术（英文版）

[1]Chao Liu;Yulong Zhang;Jiaxin Wu;Hailu Dai;Chengjian Ma;Qinfang Zhang;Zhigang Zou-.Ag-Pd alloy decorated ZnIn2S4 microspheres with optimal Schottky barrier height for boosting visible-light-driven hydrogen evolution)[J].材料科学技术（英文版）,2022(19):81-89

dominat,25Pd0,bridization,75Ag0

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