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Sulfur-vacancy engineered SmCoO3/MnCdS S-scheme heterojunction for efficient photothermal-photocatalytic H2 evolution
Yuanjin He, Hao Yang, Qiwei Guo, Bo Zhou, Xuqiang Hao*, Zhiliang Jin
https://doi.org/10.1016/j.cjsc.2026.100965
S-scheme heterojunction; Photocatalytic hydrogen evolution; Vacancy engineering; Photothermal effect; Charge separation
ABSTRACT
The development of S-scheme photocatalysts has emerged as a promising approach to address the critical bottlenecks of limited light absorption and inefficient charge separation in photocatalytic hydrogen evolution. Herein, a sulfur-vacancy engineered SmCoO3/MnCdS-Vs (SMCS) S-scheme heterojunction with photothermal effect was successfully constructed for photocatalytic hydrogen evolution. The photothermal effect induced by SmCoO3 can rapidly convert light energy into localized thermal energy, and significantly reduces the reaction energy barriers for H2O molecule activation and promotes the photocatalytic hydrogen evolution performance. The S-scheme charge transfer mechanism at the SMCS heterointerface was confirmed by in-situ X-ray photoelectron spectroscopy (XPS), charge density difference, and Bader charge. Additionally, sulfur vacancies accelerate interfacial charge transfer in the S-scheme heterojunction. The synergistic effect of S-scheme charge transfer and photothermal effects significantly enhanced charge separation and accelerated surface reactions. Consequently, the optimized SMCS photocatalyst with 5wt% SmCoO3 achieves a maximum hydrogen evolution rate of 27.03 mmol g-1 h-1, which is 3.55 times higher than that of pristine MnCdS-Vs, and an apparent quantum efficiency (AQE) up to 20.98% at 420 nm. Especially, the H2 production reaches 174 mmol g-1 over 5SMCS within 2 h under AM 1.5 simulated sunlight irradiation. This work provides an efficient strategy for designing of photothermal-assisted MnCdS-based S-scheme photocatalyst for boosting hydrogen evolution.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1