期刊
SCIENCE BULLETIN
卷 60, 期 16, 页码 1426-1433出版社
SCIENCE PRESS
DOI: 10.1007/s11434-015-0861-5
关键词
Water splitting; Oxygen evolution catalyst; Cobalt phosphate and borate; Graphene foam
资金
- National Natural Science Foundation of China [21322304, 11290161]
- National Basic Research Program of China [2012CB933003, 2013CB932603]
The cobalt phosphate-/cobalt borate-based oxygen-evolving catalysts (OECs) are the important class of earth-abundant electrocatalysts that can operate with high activity for water splitting under benign conditions. This article reports the integration of cobalt phosphate (Co-Pi) and cobalt borate (Co-Bi) OECs with three-dimensional (3D) graphene foam (GF) for the electrocatalytic water oxidation reaction. The GF showed a unique advantage to serve as a highly conductive 3D support with large capacity for anchoring and loading Co-OECs, thereby facilitating mass and charge transfer due to the large amount of active sites provided by the 3D graphene scaffold. As a result, this integrated system of GF and Co-OECs exhibits synergistically enhanced catalytic activity. The overpotential (eta) of Co-Pi and Co-Bi/graphene catalysts is about 0.390 and 0.315 V in neutral solutions, respectively. Besides, the integrated Co-OECs/graphene catalysts have also exhibited improved and stable oxygen evolution catalytic ability in alkaline solution.
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