TY - JOUR
T1 - Miniature supercapacitors composed of nickel/cobalt hydroxide on nickel-coated silicon microchannel plates
AU - Liu, Tao
AU - Xu, Shaohui
AU - Wang, Lianwei
AU - Chu, Junhao
AU - Wang, Qingjiang
AU - Zhu, Xiangrong
AU - Bing, Naici
AU - Chu, Paul K.
PY - 2011/12/21
Y1 - 2011/12/21
N2 - 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. © 2011 The Royal Society of Chemistry.
AB - 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. © 2011 The Royal Society of Chemistry.
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U2 - 10.1039/c1jm14031k
DO - 10.1039/c1jm14031k
M3 - RGC 21 - Publication in refereed journal
SN - 0959-9428
VL - 21
SP - 19093
EP - 19100
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 47
ER -