Si光阳极稳定性提高策略研究进展

doi:10.11896/cldb.21100131

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Abstract Green hydrogen produced by photoelectrochemical water splitting technology is one of the most effective and feasible approaches to solve the energy crisis and environmental pollution, which has attracted extensive attention and research. The semiconductive silicon is an excellent photoelectrode material, which has several advantages such as an ideal narrow band gap of 1.12 eV, the wide solar spectrum absorption (300—1 100 nm), and the high carrier mobility (Crystal Si, μ_n=1 350 cm²/(V·s), μ_p=500 cm²/(V·s), RT) and high crystallinity. However, the valence band edge is far lower than the potential of water oxidation (1.23 V_RHE). The water oxidation reaction is a four-electron transfer process. Thus, the intrinsic oxygen evolution kinetics of silicon photoanodes is sluggish. Meanwhile, the insulating SiO₂ or/and SiO₂(OH)^2- generated on the surface of silicon photoanodes would induce the serious photocorrosion and the issue of stability. The above limits greatly hinder the practical applications of silicon photoanodes. Recently, researchers have developed some strategies to improve the solar-to-hydrogen efficiency and stabi-lity of silicon photoanodes. This review focuses on the research progress of protection strategies of silicon photoanodes, including four improvement strategies:catalytic layer, protective layer, electrolyte protection and interface engineering. Secondly, the basic principle of photoelectrochemical water splitting and the feasibility, advantages and disadvantages of silicon semiconductor material as photoanode are analyzed. Finally, we discuss the perspectives on the potential investigation directions for improving the efficiency and stability of silicon photoanodes.

Key words： silicon photoanode photoelectrochemical water splitting stability improvement strategy

Published: 25 January 2024 Online: 2024-01-26

CLC number:

O64

Fund:Sichuan Tianfu Emei Program, the National Natural Science Foundation of China (21703150), the Sichuan Science and Technology Program (2020YJ0123), and the Science and Technology Project of Southwest Petroleum University (2021JBGS08).

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	Articles by authors
	WANG Shuxiang
	LU Xingyu
	ZOU Li
	REN Jie
	WANG Liuliu
	XIE Jiale

Cite this article:

WANG Shuxiang,LU Xingyu,ZOU Li, et al. Research Progress on Improvement Strategies of Silicon Photoanode Stability[J]. Materials Reports, 2024, 38(2): 21100131-9.

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http://www.mater-rep.com/EN/10.11896/cldb.21100131 OR http://www.mater-rep.com/EN/Y2024/V38/I2/21100131

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