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Issue 47, 2011
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Miniature supercapacitors composed of nickel/cobalt hydroxide on nickel-coated silicon microchannel plates

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Abstract

Silicon microchannel plates with a large surface area coated with a nickel layer are excellent templates for miniature supercapacitors. Three-dimensional Si-MCP/Ni/Ni(OH)2 and Si-MCP/Ni/Co(OH)2 sandwiched structures are produced with the Ni(OH)2 and Co(OH)2 thin films serving as the active materials in the supercapacitors which consist of microcrystalline and nano-sized flakes or rods. The specific capacitances derived from the CV and typical charge/discharge curves exhibit good consistency. The highest specific capacitance of 3.75 F cm−2 is obtained at a discharge current density of 10 mA cm−2 from Si-MCP/Ni/Ni(OH)2 and 1.46 F cm−2 from Si-MCP/Ni/Co(OH)2 at a scanning rate of 10 mV s−1. At high rates, the specific capacitances measured from both samples are relatively low, but the excellent capacitive properties are restored at low rates after being subjected to several high rate charge/discharge cycles. Owing to the large specific capacitance per unit area, good cycling performance, small volume, and unique three-dimensional structure, these electrodes are excellent supercapacitors suitable for secondary power sources. In addition, the potential of nickel coated Si-MCPs as templates for miniaturization and integration of devices in practical applications is discussed and demonstrated.

Graphical abstract: Miniature supercapacitors composed of nickel/cobalt hydroxide on nickel-coated silicon microchannel plates

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Publication details

The article was received on 18 Aug 2011, accepted on 22 Sep 2011 and first published on 27 Oct 2011


Article type: Paper
DOI: 10.1039/C1JM14031K
Citation: J. Mater. Chem., 2011,21, 19093-19100
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    Miniature supercapacitors composed of nickel/cobalt hydroxide on nickel-coated silicon microchannel plates

    T. Liu, S. Xu, L. Wang, J. Chu, Q. Wang, X. Zhu, N. Bing and P. K. Chu, J. Mater. Chem., 2011, 21, 19093
    DOI: 10.1039/C1JM14031K

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