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(Cu, Ag)-DOPED ZnS WITH WIDE VISIBLE LIGHT RANGE ABSORPTION FOR WATER SPLITTING: A THEORETICAL AND EXPERIMENTAL STUDY

Author

Listed:
  • XIAOBO CHEN

    (School of New Energy and Electronic Engineering, Yancheng Teachers University, Yancheng 224051, P. R. China)

  • WEIWEI LIU

    (School of New Energy and Electronic Engineering, Yancheng Teachers University, Yancheng 224051, P. R. China)

  • ZHIHAI ZHANG

    (School of New Energy and Electronic Engineering, Yancheng Teachers University, Yancheng 224051, P. R. China)

  • WEN YANG

    (Key Laboratory of Education Ministry for Advance Technique and Preparation of Renewable Energy Materials, Yunnan Normal University, Kunming 650500, P. R. China)

  • PEIZHI YANG

    (Key Laboratory of Education Ministry for Advance Technique and Preparation of Renewable Energy Materials, Yunnan Normal University, Kunming 650500, P. R. China)

Abstract

Photocatalytic water splitting using a semiconductor photocatalyst is a promising process for direct solar energy conversion. In this study, the feasibility of the photocatalytic H2 evolution on (Cu, Ag)- doped ZnS catalysts under visible light irradiation has been investigated by using first-principles density functional theory calculations and experimental studies. The present results reveal that (Cu, Ag)-doped ZnS structures have relatively small formation energy, implying that they are more easily obtained in experiment. Moreover, the absorption is enhanced obviously in the visible-light region for (Cu, Ag)-doped ZnS, but their energy levels are still suitable for water splitting to generate H2, which means that (Cu, Ag)-doped ZnS structures are promising candidate photocatalyst materials for H2 production driven by visible light. ZnS and (Cu, Ag)-doped ZnS were prepared using chemical precipitation method. (Cu, Ag)-doped ZnS samples showed an improved photocatalytic activity compared with undoped ZnS. Ag-doped ZnS (0.15 g L−1) has the highest hydrogen evolution rate of 794.6 μmol⋅ h−1 ⋅ g−1 at pH 3 (0.1 M Na2S solution as a sacrificing agent).

Suggested Citation

  • Xiaobo Chen & Weiwei Liu & Zhihai Zhang & Wen Yang & Peizhi Yang, 2020. "(Cu, Ag)-DOPED ZnS WITH WIDE VISIBLE LIGHT RANGE ABSORPTION FOR WATER SPLITTING: A THEORETICAL AND EXPERIMENTAL STUDY," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 27(04), pages 1-9, April.
    • Handle: RePEc:wsi:srlxxx:v:27:y:2020:i:04:n:s0218625x19501397
    DOI: 10.1142/S0218625X19501397
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