期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 3, 页码 532-540出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ta00160h
关键词
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资金
- Shanghai Natural Sciences Foundation [11ZR1411000]
- Shanghai Fundamental Key Project [11JC1403700, 10JC1404600]
- PCSIRT
- China NSFC [61176108, 60990312, 61076060]
- Hong Kong Research Grants Council (RGC) [CityU 112510]
Silicon microchannel plates (Si-MCPs) coated with a nickel layer are an excellent substrate in miniature supercapacitors. Nanometer-sized Co(OH)(2) flakes serving as the active materials are electrodeposited on ordered three-dimensional (3D) Ni/Si-MCPs and the Co(OH)(2) flakes have different structures depending on the solvent used. The cobalt hydroxide synthesized from a de-ionized water solvent is composed of compact nano-flakes, whereas that synthesized from an alcohol containing solvent is composed of loosely packed nano-flakes, and that from acetone are nano-flakes with nano-particles. The three types of electrode materials are investigated from the perspective of electrochemical capacitors by means of cyclic voltammogram, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy. The highest specific capacitance of 6.90 F cm(-2) is achieved from the samples prepared in acetone at a discharge current density of 10 mA cm(-2) and it is much better than the 1.46 F cm(-2) observed in previous studies, thus demonstrating excellent capacity retention.
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