Construction of a Novel S-scheme CdS-BiVO4 Heterojunction Photoelectrodes and Research on Hydrogen Production

doi:10.7503/cjcu20210212

Abstract

Abstract:

The single component photocatalysts have low photocatalytic hydrogen production efficiency due to the serious recombination of photogenerated electrons and holes and the mismatch of redox capacity and light absorption range. CdS/BiVO₄ and BiVO₄/CdS S-scheme heterojunction film photoelectrodes were prepared via chemical bath deposition and successive ionic layer adsorption and reaction method， respectively. The morphology， structure， optical and photoelectrochemical properties of the two film electrodes were characte-rized by scanning electron microscopy（SEM）， X-ray diffraction（XRD）， ultraviolet-visible（UV-Vis） spectro-scopy， and electrochemical impedance spectroscopy（EIS）， and the photocatalytic and photoelectrocatalytic hydrogen production properties of the two film electrodes were tested. The results show that S-scheme heterojunction formed between CdS and BiVO₄， BiVO₄/CdS shows the best photocatalytic hydrogen production performance， while CdS/BiVO₄ shows the best photoelectrocatalytic hydrogen production performance. With the help of surface photovoltage technology， the formation process of the built-in electric field and the carrier transport mechanism of S-scheme heterojunction in the two film electrodes are explored.

Key words: S-scheme heterojunction, Photoelectrode, Internal electric field, Hydrogen production

CLC Number:

O646

TrendMD:

XUE Jinbo, GAO Guoxiang, SHEN Qianqian, LIU Tianwu, LIU Xuguang, JIA Husheng. Construction of a Novel S-scheme CdS-BiVO₄ Heterojunction Photoelectrodes and Research on Hydrogen Production[J]. Chem. J. Chinese Universities, 2021, 42(8): 2493.

Figures/Tables 7

References 22

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Photoelectrode	10^-6R_trap/Ω	10¹²C_bulk/F	10^-6R_ss/Ω	10¹²C_ss/F
CdS	27.75	2.775	135.1	3.724
BiVO₄	0.3478	5.451	4.845	25.82
CdS/BiVO₄	7.106	6.864	1.245	488100
BiVO₄/CdS	5.663	5.335	56.03	1.469

Photoelectrode	10^-6R_trap/Ω	10¹²C_bulk/F	10^-6R_ss/Ω	10¹²C_ss/F
CdS	27.75	2.775	135.1	3.724
BiVO₄	0.3478	5.451	4.845	25.82
CdS/BiVO₄	7.106	6.864	1.245	488100
BiVO₄/CdS	5.663	5.335	56.03	1.469

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Construction of a Novel S-scheme CdS-BiVO₄ Heterojunction Photoelectrodes and Research on Hydrogen Production

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