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

Xiaobo Chen, Weiwei Liu, Zhihai Zhang, Wen Yang and Peizhi Yang ()
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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

Surface Review and Letters (SRL), 2020, vol. 27, issue 04, 1-9

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).

Keywords: Zinc sulfide; doped ZnS; optical absorption coefficient; photoelectrochemical hydrogen production (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501397

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