Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 10, Pages 7230-7240Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.11.214
Keywords
Cu-MOFs; MnCdS; S-scheme heterojunction; Photocatalytic H-2 evolution
Categories
Funding
- Open Project of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University [2018-K30, 2019-KF-36]
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The study focused on constructing a S-scheme heterojunction photocatalyst using Cu-MOFs and Mn0.05Cd0.95S, which exhibited powerful photocatalytic hydrogen evolution activity with efficient electron-hole separation and transfer. Characterization results indicated excellent photocatalytic performance and light absorption capacity, along with chemical stability of the composite catalyst. The S-scheme process demonstrated effective elimination of useless electrons and holes, contributing to a new strategy for rational structure heterojunction photocatalysts for hydrogen evolution.
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.
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