Journal
ELECTROCHIMICA ACTA
Volume 149, Issue -, Pages 341-348Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.10.117
Keywords
amorphous; MnO2; 3D-Ni; supercapacitors
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Funding
- Natural Science Foundations of China [21306030]
- Natural Science Foundations of Guangdong Province [s2012010009719, s2013040015229]
- Program Foundation of the second batch of innovation teams of Guangzhou Bureau of Education [13C04]
- Scientific Research Project of Guangzhou Municipal Colleges and Universities [2012A064]
- Fresh Talent Program of Guangzhou University [201302]
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In this paper, we report a metal oxide/metal MnO2/3D dendrites-like Ni core-shell electrode on Ni foam for high-performance supercapacitors. The MnO2/3D-Ni electrode exhibits a large areal capacitance (837.6 mF cm(-2)) at high loading mass of MnO2(3 mg cm(-2)). Moreover, MnO2/3D-Ni composite electrodes exhibit excellent rate capability and high cycling stability (16% degradation after 2000 cycles). The high electrochemical properties of MnO2/3D-Ni electrode can be attributed to the high conductivity of the Ni metal core, high porous and large specific surface structure of the MnO2/3D-Ni nanocomposites, which facilitates electrolyte diffusion, electron transport, and material utilization. These results indicate highly conductive 3D dendrites-like Ni nanoparticles may could provide new opportunities for the development of high performance supercapacitors. (C) 2014 Elsevier Ltd. All rights reserved.
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