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

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Abstract
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 [email protected]3O4 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 [email protected]3O4 and Co3O4 heterostructures on nickel foam are thoroughly characterized. The [email protected]3O4 electrode exhibits high capacitance of 1.72 F cm–2 (857.7 F g–1) at a current density of 1 A g–1, which is higher than that of the Co3O4 electrode. Impressively, the capacitance of the [email protected]3O4 electrode increases gradually from 1.29 to 1.66 F cm–2 (830.8 F g–1) after 6000 cycles at a high current density of 6 A g–1, indicating good long-term cycling stability. These results indicate the unique [email protected]3O4 electrode would be a promising electrode for high-performance supercapacitor applications.
Funding Information
  • National Natural Science Foundation of China (61376073)
  • Ministry of Science and Technology of the People's Republic of China (2007CB310500)

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