富缺陷晶态WSe<sub>2</sub>纳米片:一种潜在的高效低成本析氢反应电催化剂

doi:10.11896/cldb.19110041

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Abstract The edges of layered transition metal dichalcogenides (TMDs) are recognized as the active sites for electrocatalytic hydrogen evolution, therefore considerable efforts have been devoted to increasing the edge density of TMDs. Given that defect-enriched TMDs are synthesized at mild conditions, their low crystallinity normally results in poor electrochemical stability. Although high-temperature processing is efficient to achieve highly crystalline TMDs, which in turn leads to low electrocatalytic activity due to the loss of reactive defects and edge sites. In this work, defect-enriched WSe₂ with high crystallinity was synthesized via a long-term ultrasonic treatment of crystalline WSe₂ plates in ethanol. Few-layered WSe₂ nanosheets (NSs) were firstly obtained by ultrasonication-assisted exfoliation of WSe₂ plates, while island-like domains were subsequently formed under durable ultrasonication. The resultant defect-rich crystalline WSe₂ NSs possessing large specific surface area, abundant active sites and high crystallinity exhibit superior electrocatalytic performance for hydrogen evolution reaction.

Key words： transition metal dichalcogenides WSe₂ nanosheets ultrasonic assisted exfoliation electrocatalysis water electrolysis hydrogen production hydrogen evolution reaction

Published: 15 January 2020

CLC number:

O646

Fund:This work was supported by the National Natural Science Foundation of China (51902261), the Natural Science Basic Research Program of Shaanxi (2019JQ-025), Fundamental Research Funds for the Central Universities (31020180QD094, 31020180QD116).

About author:: Hongfang Du is working as an assistant professor in the Institute of Flexible Electronics at Northwestern Polytechnical University. He received his Ph.D. degree in clean energy science from Southwest University in 2018. He worked as a research assistant on a clean energy project at Nanyang Technological University from 2016 to 2018. His research interests are in the area of flexible electronics, functional nanomaterials synthesis and their applications in clean energy conversion systems, including water splitting, nitrogen reduction, carbon dioxide, etc.
Wei Ai received his Ph.D. and M.S. degrees from Nanyang Technological University and Nanjing University of Posts and Telecommunications, respectively. After working as a research associate at Nanyang Technological University, he joined in the Institute of Flexible Electronics at Northwestern Polytechnical University. His research interests focus on electrochemical materials and technologies, new energy devices, flexible intelligence technologies, etc.
Wei Huang received his B.S., M.S., and Ph.D. degrees in Chemistry from Peking University in 1983, 1988, and 1992, respectively. In 2001, he became a chair professor at Fudan University, where he founded the Institute of Advanced Materials (IAM). In 2006, he was appointed as the Deputy President of Nanjing University of Posts and Telecommunications. He was elected as the Academician of Chinese Academy of Sciences in 2011. In 2012, he was appointed as the President of Nanjing Tech University. Now he is the Deputy President and Provost of the Northwestern Polytechnical University. His research interests include flexible electronics, organic optoelectronics, nanoelectronics, and bioelectronics.

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	DU Hongfang
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Cite this article:

DU Hongfang,WANG Ke,HE Song, et al. Defect-rich Crystalline WSe₂ Nanosheets as Efficient Electrocatalysts for Hydrogen Evolution Reaction[J]. Materials Reports, 2020, 34(1): 1195-1200.

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http://www.mater-rep.com/EN/10.11896/cldb.19110041 OR http://www.mater-rep.com/EN/Y2020/V34/I1/1195

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