Acta Phys. -Chim. Sin. ›› 2025, Vol. 41 ›› Issue (8): 100093.doi: 10.1016/j.actphy.2025.100093

Special Issue: S-scheme heterojunction in photocatalysis

• ARTICLE • Previous Articles     Next Articles

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

Weikang Wang1, Yadong Wu1, Jianjun Zhang2,*(), Kai Meng3, Jinhe Li1, Lele Wang1, Qinqin Liu1,*()   

  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
  • Received:2025-03-13 Revised:2025-04-01 Accepted:2025-04-10 Published:2025-06-07
  • Contact: Email: zhangjianjun@cug.edu.com; Tel.: +86-13921581597 (Jianjun Zhang)qqliu@ujs.edu.cn (Qinqin Liu)
  • Supported by:
    the Natural Science Foundation of China(22472069); the Natural Science Foundation of China(22102064); the Natural Science Foundation of China(22302080); Anhui Key Laboratory of Nanomaterials and Nanotechnology, the Major Science and Technology Projects in Anhui Province(202305a12020006)

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Abstract:

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 Cd0.5Zn0.5In2S4 (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.

Key words: S-scheme heterojunction, H2O2 production, Photothermal effect, Melamine foam, Sacrificial-Agent-Free