Citation: Weikang Wang, Yadong Wu, Jianjun Zhang, Kai Meng, Jinhe Li, Lele Wang, Qinqin Liu. Green H₂O₂ synthesis via melamine-foam supported S-scheme Cd_0.5Zn_0.5In₂S₄/S-doped carbon nitride heterojunction: synergistic interfacial charge transfer and local photothermal effect[J]. Acta Physico-Chimica Sinica, ;2025, 41(8): 100093. doi: 10.1016/j.actphy.2025.100093 shu

Green H₂O₂ synthesis via melamine-foam supported S-scheme Cd_0.5Zn_0.5In₂S₄/S-doped carbon nitride heterojunction: synergistic interfacial charge transfer and local photothermal effect

Weikang Wang ¹ ,
Yadong Wu ¹ ,
Jianjun Zhang ^2,, ,
Kai Meng ³ ,
Jinhe Li ¹ ,
Lele Wang ¹ ,
Qinqin Liu ^1,,

1.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China
2.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China
3.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei Province, China

Corresponding author: Jianjun Zhang, zhangjianjun@cug.edu.com Qinqin Liu, qqliu@ujs.edu.cn
Received Date: 13 March 2025
Revised Date: 1 April 2025
Accepted Date: 10 April 2025

Fund Project: the Natural Science Foundation of China 22472069the Natural Science Foundation of China 22102064the Natural Science Foundation of China 22302080Anhui Key Laboratory of Nanomaterials and Nanotechnology, the Major Science and Technology Projects in Anhui Province 202305a12020006

Green photocatalytic synthesis of hydrogen peroxide (H₂O₂) represents a promising alternative to the energy-intensive anthraquinone process, yet it is hindered by rapid carrier recombination and insufficient redox capacity in sacrificial-agent-free systems. This work reports a melamine foam (MF)-supported sulfur (S)-doped carbon nitride (SCN)/S vacancy-modified Cd_0.5Zn_0.5In₂S₄ (CZIS) S-scheme heterojunction (CZIS/SCN/MF) via an in situ chemical bath-hydrothermal method for sacrificial-agent-free H₂O₂ photosynthesis. The S-scheme charge transfer mechanism was confirmed by in situ irradiated X-ray photoelectron spectroscopy, free-radical trapping electron paramagnetic resonance, femtosecond transient absorption spectra and theoretical calculations. Specifically, the sulfur doping could modulate the local charge distribution of the carbon nitride framework to reinforce the interfacial built-in electric field for the CZIS/SCN S-scheme heterojunction. Meanwhile, the calcination-induced S-vacancies in CZIS could serve as photoelectron traps, promoting charge separation, and reserving photoinduced holes for H₂O oxidation, thereby achieving sacrificial-agent-free H₂O₂ synthesis. Coupled with the photothermal effect of MF's three-dimensional porous framework, the CZIS/SCN/MF catalyst with optimized S-doping density and SCN dosage delivers an H₂O₂ production rate of 3.46 mmol·g⁻¹·h⁻¹ in pure water, surpassing most of the sacrificial-agent-free systems. This study proposes a novel strategy for synergistic interfacial charge regulation and energy conversion enhancement in sacrificial-agent-free photocatalytic systems.
- S-scheme heterojunction,
- H₂O₂ production,
- Photothermal effect,
- Melamine foam,
- Sacrificial-Agent-Free
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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

Green H2O2 synthesis via melamine-foam supported S-scheme Cd0.5Zn0.5In2S4/S-doped carbon nitride heterojunction: synergistic interfacial charge transfer and local photothermal effect

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通讯作者: 陈斌, bchen63@163.com

Green H₂O₂ synthesis via melamine-foam supported S-scheme Cd_0.5Zn_0.5In₂S₄/S-doped carbon nitride heterojunction: synergistic interfacial charge transfer and local photothermal effect