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Composition-dependent activity of Mn-doping NiS2 nanosheets for boosting photocatalytic H(2 )evolution
Zhu, Xi; Pan, Ziwei; Liu, Yuxin; Kang, Shuai; Wang, Liang; Lu, Wenqiang
2023
摘要Two-dimensional transition metal disulfides are excellent photocatalytic materials, which can be significantly improved by optimizing the composition and structure. Herein, Mn-doping NiS2 of (Ni1-xMnx)-S with various Ni/Mn molar ratios is proposed via a facile and low-cost solvothermal method. The optimal (Ni4/6Mn2/6)-S exhibits pinecone-like morphology composed of tiny nanosheets with enlarged active sites, which facilitates the separation of photoinduced electrons and holes, improves the electron transfer ability and conductivity, and enlarges the active sites compared with pure NiS2 and MnS. Also, the negative shift of the conduction band derived from Mott-Schottky plots and the empirical formula provides a high thermodynamic driving force for hydrogen catalytic reaction. (Ni4/6Mn2/6)-S performs an ultrahigh hydrogen evolution rate of 24.86 mmol g(-1) h(-1) under UV-visible light irradiation, which is 1.5 times higher than pure NiS2 (16.92 mmol g(-1 )h(-1)) and 2.3 times higher than pure MnS (10.69 mmol g(-1) h(-1)). The outstanding repeatability of 86.7% retention and apparent quantum yield of 46.9% are also achieved. Therefore, this work offers a novel bimetallic sulfide of (Ni1-xMnx)-S to improve the conversion efficiency of solar energy to chemical energy for photocatalytic hydrogen production. (C) 2022 Published by Elsevier Inc.
关键词Photocatalyst Photocatalysis Hydrogen NiS2 MnS Bimetallic sulfides
DOI10.1016/j.jcis.2022.09.076
发表期刊JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
卷号629页码:22-35
通讯作者Lu, Wenqiang(wqlu@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000877070400002
语种英语