Citation: Yanyan Zhao, Zhen Wu, Yong Zhang, Bicheng Zhu, Jianjun Zhang. Enhancing photocatalytic H₂O₂ production via dual optimization of charge separation and O₂ adsorption in Au-decorated S-vacancy-rich CdIn₂S₄[J]. Acta Physico-Chimica Sinica, ;2025, 41(11): 100142. doi: 10.1016/j.actphy.2025.100142 shu

Enhancing photocatalytic H₂O₂ production via dual optimization of charge separation and O₂ adsorption in Au-decorated S-vacancy-rich CdIn₂S₄

Yanyan Zhao ^1,, ,
Zhen Wu ¹ ,
Yong Zhang ² ,
Bicheng Zhu ³ ,
Jianjun Zhang ^3,,

1.
College of Biology Pharmacy and Food Engineering, Shangluo University, Shangluo 726000, Shaanxi Province, China
2.
School of Advanced Materials and Green Chemical Engineering, Hubei Polytechnic University, Huangshi 435003, Hubei Province, China
3.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China

Corresponding author: Yanyan Zhao, zhaoyanyan41@163.com Jianjun Zhang, zhangjianjun@cug.edu.cn
Received Date: 30 June 2025
Revised Date: 28 July 2025
Accepted Date: 29 July 2025

Fund Project: National Natural Science Foundation of China 22409128National Natural Science Foundation of China 22378103

Photocatalytic oxygen reduction reaction (ORR) offers a mild and cost-effective approach for hydrogen peroxide (H₂O₂) production. However, its practical application is significantly hindered by rapid charge carrier recombination and insufficient O₂ adsorption capacity in photocatalysts. To address these limitations, we developed a strategy involving the creation of S-vacancy-rich CdIn₂S₄ (S_v–CIS) to facilitate charge separation and subsequent deposition of Au nanoparticles on its surface (Au–S_v–CIS) to strengthen O₂ adsorption. The results suggest that the optimized Au–S_v–CIS achieves a significantly increased H₂O₂ production yield of 2542 μmol·h⁻¹·g⁻¹ in 10%-ethanol/water solution, which is about 12.8 and 1.7 times higher than that of pure CIS and S_v–CIS. Comprehensive characterizations including photoluminescence spectra, time-resolved photoluminescence spectra, transient photocurrent response, electrochemical impedance spectra, and femtosecond transient absorption spectroscopy confirm the improved charge dynamics of Au–S_v–CIS. In addition, temperature-programmed desorption of O₂ combined with density functional theory calculations conclusively demonstrates the superior O₂ adsorption capacity of Au–S_v–CIS. This work provides a design strategy for efficient solar-to-chemical energy conversion through cooperative photocatalyst engineering.
- S vacancy,
- Charge separation,
- O₂ adsorption,
- CdIn₂S₄,
- Hydrogen peroxide
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Enhancing photocatalytic H2O2 production via dual optimization of charge separation and O2 adsorption in Au-decorated S-vacancy-rich CdIn2S4

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通讯作者: 陈斌, bchen63@163.com

Enhancing photocatalytic H₂O₂ production via dual optimization of charge separation and O₂ adsorption in Au-decorated S-vacancy-rich CdIn₂S₄