Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 28, Pages 10786-10793Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04258a
Keywords
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Funding
- National Natural Science Foundation of China [21576034]
- International S&T Cooperation Projects of Chongqing [CSTC2013gjhz90001]
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Unique CuO@MnO2 core-shell nanostructures on a copper grid have been prepared on a large scale by quick wet etching and hydrothermal deposition methods for advanced binder-free supercapacitor electrodes. The CuO@MnO2 nanostructures are regulated and controlled on the basis of time-dependent experiments. This core-shell nanostructure displays a very high specific capacitance (343.9 F g(-1) at a current density of 0.25 A g(-1)), remarkable cycling stability (83.1% retention after 12 000 cycles) and a good rate capability (70.5% of the original capacitance). These perfect electrochemical properties are attributed to synergic interaction of each component. In addition, the asymmetric supercapacitor exhibits a high energy density of 29.9 W h kg(-1) at a power density of 269.6 W kg(-1). These findings make it attractive that the CuO@MnO2 core-shell nanostructure on a copper grid is a promising electrode material for electrochemical supercapacitors.
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