Tunable synthesis of hierarchical NiCo2O4 nanosheets-decorated Cu/CuOx nanowires architectures for asymmetric electrochemical capacitors
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AbstractWe demonstrate a facile and tunable preparative strategy of porous NiCo2O4 nanosheets-decorated Cu-based nanowires hybrids as high-performance supercapacitor electrodes. A fast faradic reaction has been realized by inducing elementary copper core in the composite, which assists in high electric conductivity of the cell and creates intimate channels for fast charge collection and electron transfer. As a result, this hybrid composite electrode displays high specific capacitance (578 F g-1 at current density of 1.0 A g-1) and rate capability (80.1% capacitance retention from 1 A g-1 to 10 A g-1). Additionally, asymmetric device is constructed from NiCo2O4/Cu-based NWs and activated graphene (AG) with an operation potential from 0 to 1.4 V. The asymmetric device exhibits an energy density of 12.6 Wh kg-1 at a power density of 344 W kg-1 and excellent long-term cycling stability (only 1.8% loss of its initial capacitance after 10,000 cycles). These attractive findings suggest that such unique NiCo2O4/Cu-based NWs hybrid architecture is promising for electrochemical applications as efficient electrode material.
CitationKuang, M., Zhang, Y. X., Li, T. T., Li, K. F., Zhang, S. M., Li, G., & Zhang, W. (2015). Tunable synthesis of hierarchical NiCo 2 O 4 nanosheets-decorated Cu/CuOx nanowires architectures for asymmetric electrochemical capacitors. Journal of Power Sources, 283, 270–278. doi:10.1016/j.jpowsour.2015.02.117
SponsorsThe authors gratefully acknowledge the financial supports provided by National Natural Science Foundation of China (Grant no. 51104194 and 51104121), National Key laboratory of Fundamental Science of Micro/Nano-device and System Technology (2013MS06, Chongqing University) and Fundamental Research Funds for the Central Universities (Project no. CDJZR14135501, Chongqing University, PR China).The authors acknowledge sincere discussion and suggestions by Prof. Hongjin Fan in NTU, Singapore. The authors acknowledge support on electrochemical characterization by Dr. Kexin Yao in King Abdullah University of Science and Technology, Saudi Arabia.
JournalJOURNAL OF POWER SOURCES