Citation: Yang Xia, Kangyan Zhang, Heng Yang, Lijuan Shi, Qun Yi. Improving Photocatalytic H₂O₂ Production over iCOF/Bi₂O₃ S-Scheme Heterojunction in Pure Water via Dual Channel Pathways[J]. Acta Physico-Chimica Sinica, ;2024, 40(11): 240701. doi: 10.3866/PKU.WHXB202407012 shu

Improving Photocatalytic H₂O₂ Production over iCOF/Bi₂O₃ S-Scheme Heterojunction in Pure Water via Dual Channel Pathways

Yang Xia ^1,, ,
Kangyan Zhang ¹ ,
Heng Yang ^2,, ,
Lijuan Shi ¹ ,
Qun Yi ^1,,

1.
Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430072, China
2.
College of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China

Corresponding author: Yang Xia, xiayang410@sina.com Heng Yang, yhxg666@sina.com Qun Yi, yq20071001@163.com
Received Date: 9 July 2024
Revised Date: 16 August 2024
Accepted Date: 19 August 2024
Available Online: 27 August 2024
Fund Project: the National Natural Science Foundation of China 2210821the Key Research and Development Project of Hainan Province ZDYF2024GXJS005the Research and Innovation Initiatives of WHPU 2024Y18

Solar photocatalysis is a green, economical, and sustainable method for H₂O₂ synthesis, which has been regarded as the most promising alternative to the traditional anthraquinone oxidation method. However, single-component photocatalyst exhibits moderate activity owing to the limited light-harvesting range, fast charge recombination and inadequate redox capacity. Moreover, the addition of sacrificial agents is required in the reaction system. Herein, we present the development of an S-scheme heterojunction, achieved through photodepositing Bi₂O₃ nanoparticles (BO) on ionic covalent organic framework nanofiber (iCOF). The optimized photocatalyst iCOF/BO10 shows the highest H₂O₂ production performance in pure water, achieving an H₂O₂ yield of 9.76 mmol·g⁻¹·h⁻¹ with an apparent quantum yield (AQY) of 5.5% at 420 nm. This photocatalytic performance is approximately 2.2 and 5.6 times as high as that of pristine iCOF and BO, respectively. In-depth characterizations including in situ irradiated XPS, DFT-calculations, active species trapping experiments and in situ DRIFTS, reveal that the obtained sample not only facilitates charge carrier separation and enhances light absorption capability, but also maximizes the redox ability to concurrently achieve indirect 2e⁻ ORR and 4e⁻ WOR for H₂O₂ production. Additionally, the generated O₂ from the 4e⁻ WOR is capable of accelerating the reaction kinetics for H₂O₂ formation via the indirect 2e⁻ ORR pathway, enabling overall photocatalytic H₂O₂ synthesis. This work provides a new insight into creating innovative catalysts for achieving high-efficiency photosynthesis of H₂O₂.
- Photocatalysis,
- S-scheme heterojunction,
- H₂O₂ production,
- Non-sacrificial agent,
- Dual channels
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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

Improving Photocatalytic H2O2 Production over iCOF/Bi2O3 S-Scheme Heterojunction in Pure Water via Dual Channel Pathways

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通讯作者: 陈斌, bchen63@163.com

Improving Photocatalytic H₂O₂ Production over iCOF/Bi₂O₃ S-Scheme Heterojunction in Pure Water via Dual Channel Pathways