期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 48, 页码 41237-41245出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11576
关键词
water splitting; NiCoP; hyperbranched architecture; bifunctional catalyst; hydrogen evolution reaction; oxygen evolution reaction
资金
- NSFC [51772249, 51472204, 51521061]
- NSF of Shannxi Province [2018JM5092]
- Fundamental Research Funds for the Central Universities [G2017KY0308]
- Hong Kong Scholars Program [XJ2017012]
- Guangdong Special Fund for Science and Technology Development (Hong Kong Technology Cooperation Funding Scheme) [201604030012, 201704030019, 201704030065]
Developing inexpensive transition-metal-based nanomaterials with high electrocatalytic activity is of significant necessity for electrochemical water splitting. In this study, we propose a controllable structural engineering strategy of constructing a hyperbranched architecture for highly efficient hydrogen evolution reaction/oxygen evolution reaction (HER/OER). Hyperbranched NiCoP architecture organized by hierarchical nanorod-on-nanosheet arrays is rationally prepared as a demonstration via a facile solvothermal and phosphorization approach. A strong synergistic benefit from the multiscale building blocks is achieved to enable outstanding electrocatalytic properties in an alkaline electrolyzer, including low HER and OER overpotentials of 71 and 268 mV at 10 mA cm(-2), respectively, which significantly outperforms the counterparts of individual nanorods and nanosheets. The bifunctional catalysts also show highly efficient and durable overall water electrocatalysis with a small voltage of 1.57 V to drive a current density of 10 mA cm(-1). The present study will open a new window to engineering hyperbranched architectures with exceptional electrocatalytic activities toward overall water splitting.
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