Regular octahedron Cu-MOFs modifies Mn0.05Cd0.95S nanoparticles to form a S-scheme heterojunction for photocatalytic hydrogen evolution
Regular octahedron Cu-MOFs modifies Mn0.05Cd0.95S nanoparticles to form a S-scheme heterojunction for photocatalytic hydrogen evolution
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DOI：
10.1016/j.ijhydene.2020.11.214
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发表时间：
2021-01-28
影响因子：
7.2
通讯作者：
Ma, Qingxiang
中科院分区：
文献类型：
--
作者：
Cao, Yue;Wang, Guorong;Ma, Qingxiang
结构化、高效、高效的光催化剂是提高光催化效率的关键。本工作采用正八面体Cu-MOF和纳米Mn0.05Cd0.95S构成S方案异质结。CuMOFS/Mn0.05Cd0.95S(5wt%)复合材料在可见光(波长420 nm)照射下5h具有很强的光催化析氢活性，5h光催化析氢活性可达547.5 mmol.这归因于CuMOF/Mn0.05Cd0.95S(5wt%)异质结具有较强的氧化还原能力和高效的电子、空穴分离与转移能力.扫描电子显微镜和高分辨电子显微镜结果表明，CuMOF与Mn0.05Cd0.95S有紧密的接触。PL、TRPL和电化学性质进一步表明复合光催化剂具有良好的光催化性能。UV-Vis DRS分析表明，该复合催化剂具有良好的光吸收能力。X射线光电子能谱(XPS)、傅立叶变换红外光谱(FT-TR)和X射线衍射谱(XRD)表明，复合光催化剂具有良好的化学稳定性。S方案可以消除无用的电子和空穴，并提供更多的电子参与H-2的析出还原。这项工作为结构合理的异质结析氢光催化剂提供了新的策略。(C)2020氢能源出版物有限责任公司。爱思唯尔有限公司出版。保留所有权利。
Structured efficient and effective photocatalysts was crucial to improve photocatalytic efficiency. In this work, regular octahedron Cu-MOFs and Mn0.05Cd0.95S nanoparticles were adopted to constitute a S-scheme heterojunction. The Cu-MOFs/Mn0.05Cd0.95S (5 wt%) composite exhibited powerful photocatalytic hydrogen evolution activity of 547.5 mmol after 5 h under visible light irradiation (lambda > 420 nm), which was ascribed to structure a S-scheme heterojunction brought great redox capacity and efficient separation and transfer of electrons and holes. The SEM and HRTEM results presented close contact of the Cu-MOFs and Mn0.05Cd0.95S. The PL, TRPL, and electrochemical properties further indicated that the composite photocatalysts had competent photocatalytic performance. The UV-vis DRS indicated that the composite catalyst had excellent light absorption capacity. It was confirmed that the composite photocatalysts owned excellent chemical stability by the XPS, FT-TR, and XRD. The S-scheme process can eliminate useless electrons and holes and provide more electrons to participate H-2 evolution reduction. This work contributed new strategy to rational structure heterojunction photocatalysts for hydrogen evolution. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.