期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 42, 期 16, 页码 10925-10930出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.02.126
关键词
In-situ anion exchange; Hierarchical nanostructure; Hydrogen evolution reaction; Cu2-xSe
资金
- National Science Foundation of China (NSFC) [51172043]
Efficient and robust Earth-abundant catalysts for hydrogen evolution reaction (HER) is one of the key components for clean energy technologies aimed at reducing future carbon emissions. Here, an in-situ anion exchange approach to prepare hierarchical nano structures consisting of ultrathin Cu2-xSe nanosheet is reported. With the aid of the selenylation process and the hierarchical ultrathin nanostructure, the nanostructured Cu2-xSe/Cu foam electrode achieved considerably enhanced HER performance with a large geometric current density of -100 mA cm(-2) at a small overpotential of 313 mV and outstanding long-term operational stability. Significant improvement of electrocatalytic activity for Cu2-xSe catalyst could be attributed to the promoted mass diffusion/transfer properties, which results from its special structural feature. Meanwhile, the overpotential associated with the catalyst/substrate interface could be effectively eliminated due to the self-supported construction. We believe that this work will lead towards the further development of Cu-based chalcogenides for applications in electrocatalysis and energy conversion. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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