High-Performance Supercapacitor Electrode Based on the Unique ZnO@Co3O4 Core/Shell Heterostructures on Nickel Foam

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• 作者：Daoping Cai ; Hui Huang ; Dandan Wang ; Bin Liu ; Lingling Wang ; Yuan Liu ; Qiuhong Li ; Taihong Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 24, 2014
• 年：2014
• 卷：6
• 期：18
• 页码：15905-15912
• 全文大小：663K
• ISSN：1944-8252

文摘

Currently, tremendous attention has been paid to the rational design and synthesis of unique core/shell heterostructures for high-performance supercapacitors. In this work, the unique ZnO@Co₃O₄ core/shell heterostructures on nickel foam are successfully synthesized through a facile and cost-effective hydrothermal method combined with a short post annealing treatment. Mesoporous Co₃O₄ nanowires are multidirectional growing on the rhombus-like ZnO nanorods. In addition, the growth mechanism for such unique core/shell heterostructures is also proposed. Supercapacitor electrodes based on the ZnO@Co₃O₄ and Co₃O₄ heterostructures on nickel foam are thoroughly characterized. The ZnO@Co₃O₄ electrode exhibits high capacitance of 1.72 F cm^鈥? (857.7 F g^鈥?) at a current density of 1 A g^鈥?, which is higher than that of the Co₃O₄ electrode. Impressively, the capacitance of the ZnO@Co₃O₄ electrode increases gradually from 1.29 to 1.66 F cm^鈥? (830.8 F g^鈥?) after 6000 cycles at a high current density of 6 A g^鈥?, indicating good long-term cycling stability. These results indicate the unique ZnO@Co₃O₄ electrode would be a promising electrode for high-performance supercapacitor applications.

Keywords:

cobalt oxides; core/shell; electrode material; binder-free; supercapacitor