期刊
JOURNAL OF POWER SOURCES
卷 341, 期 -, 页码 250-256出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.10.096
关键词
Electrochemical water splitting; Bifunctional catalyst; Hydrogen evolution reaction; Oxygen evolution reaction
资金
- National Natural Science Foundation of China [21376105, 21576113]
- Foshan Innovative and Entepreneurial Research Team Program [2014IT100062]
Electrochemical water splitting has attracted great interest because of the growing demand for sustainable energy and increasing concerns for the environment. We present a facile strategy to design the three-dimensional (3D) urchin-like sphere arrays Co3O4 as an effective bifunctional catalyst for electrochemical water splitting. The 3D urchin-like Co3O4 was directly grown on Ni foam by a hydrothermal reaction and annealing treatment at a low temperature. This process offers several advantages including facile synthesis, binder-free, and low cost. The 3D urchin-like Co3O4 as a catalyst for hydrogen evolution reaction exhibits a low onset potential (-130 mV vs. RHE) and good cycling stability in an alkaline electrolyte. When urchin-like Co3O4 is used as a catalyst for oxygen evolution reaction, the onset potential is at 1.46 V (vs. RHE) with a low overpotential of only 230 mV. The good catalytic activity can be attributed to the unique urchin-like nanostructure, abundant mesopores, and low charge-transfer resistance (compared with Co3O4 NPs). In addition, H-2 and O-2 generation was performed using Co3O4 as both cathode and anode catalysts with a potential of 1.64 V to reach a current density of 10 mA cm(-2). (C) 2016 Elsevier B.V. All rights reserved.
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