3D graphene foam-supported cobalt phosphate and borate electrocatalysts for high-efficiency water oxidation

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• 作者：Min Zeng ; Hao Wang ; Chong Zhao ; Jiake Wei ; Wenlong Wang ; Xuedong Bai
• 关键词：Water splitting ; Oxygen evolution catalyst ; Cobalt phosphate and borate ; Graphene foam
• 刊名：Chinese Science Bulletin
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：60
• 期：16
• 页码：1426-1433
• 全文大小：1,390 KB
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• 作者单位：Min Zeng (1)
  Hao Wang (1)
  Chong Zhao (1)
  Jiake Wei (1)
  Wenlong Wang (1)
  Xuedong Bai (1)
  
  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
  
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541

文摘

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 (η) 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. Keywords Water splitting Oxygen evolution catalyst Cobalt phosphate and borate Graphene foam