Three-dimensional nickel-coated silicon microchannel plates for supercapacitors

Abstract

Abstract: A unique three-dimensional Si-MCP/Ni/Ni(OH)2 structure for supercapacitor was produced. Chemical liquid deposition was carried out to grow nano-sized Ni(OH)2. The as-prepared Ni(OH)2 film consists of many intertwined nano-flakes with both the α- and β-Ni(OH)2 phases. The formation mechanism of Ni(OH)2 was introduced. The as-prepared and annealed materials were evaluated electrochemically by cyclic voltammetry and chronopotentiometry. The cyclic voltammetry results reveals a typical redox characteristic of the sample. A specific capacitance of 2 150 F/g was observed at a discharge current of 10 mA, and the structure has high stability in prolonged charging and discharging experiments. The capacitance of the annealed sample decreases as the annealing temperature increases. Surface morphology of the samples after 2 000 cycles and annealed samples were observed. Decrease of the surface area of Ni(OH)2 is consi-dered as the main reason of the capacitive loss. Owing to the large specific capacitance and good stability, the unique structure is suitable for electrochemical super-capacitors used in secondary power sources and devices.

Key words: three-dimensional, silicon microchannel plate, nickel hydroxide, supercapacitors

CLC Number:

O649.4

LIU Tao, WANG Fei, XU Shao-hui, WANG Lian-wei. Three-dimensional nickel-coated silicon microchannel plates for supercapacitors[J]. Journal of East China Normal University(Natural Sc, 2012, 2012(5): 1-9.

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