期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 13, 页码 6535-6543出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.01.172
关键词
Hydrogen evolution reaction; Electrocatalysts; Nanosheet array; Water splitting
资金
- National Natural Science Foundation of China [21575078, 21676060]
- Major Project of Collaboration and Innovation of Guangzhou City, University and Research Institute [201704020005]
Chemically polished Ti foil has been shown to be an excellent substrate for the growth of low-interface-resistance electrocatalysts. Herein, we grow vertically aligned interlaced mesh -network NiP2 nanosheets on deeply polished Ti foil (NiP2 NS/Ti) by the gas-phase phosphidation of Ni(OH)(2). The produced interconnected nanosheets provide abundant electron transfer pathways and facilitate electron transfer, as confirmed by electrochemical impedance spectroscopy measurements and the presence of numerous voids that allow for fast gas release and ion migration. In view of the above advantages, the NiP2 NS/Ti shows high electrocatalytic activity for the hydrogen evolution reaction in both alkaline and acidic solutions, wherein overpotentials of only 134 and 140 mV are required to attain a current density of 10 mA cm(-2), respectively. In addition, the above electrode also features a small Tafel slope (60.5 mV dec(-1) in alkaline and 49.5 mV dec(-1) in acidic solutions) and long-term stability, and can therefore be employed as an efficient and cheap three-dimensional cathode for electrochemical water splitting. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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