Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 589, Issue -, Pages 364-371Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.11.230
Keywords
Electrochemical capacitors; Electrodeposition; Ni-Co alloys; Ordered three-dimensional microchannel plates; Nanoparticles
Categories
Funding
- Shanghai Natural Sciences Foundation [11ZR1411000]
- Shanghai Fundamental Key Project [11JC1403700, 10JC1404600]
- PCSIRT
- China NSFC [61176108, 60990312, 61076060]
- Hong Kong Research Grants Council (RGC)
- General Research Funds (GRF) [CityU 112510, 112212]
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Silicon microchannel plates (Si-MCPs) coated with a layer of nickel cobalt alloy (NCA) constitute an excellent substrate for miniature supercapacitors. Nanoscale Ni(OH)(2)-Co(OH)(2) composite particles serving as the active materials are electrodeposited on ordered three-dimensional (3D) NCA/Ni/Si-MCPs and the Ni(OH)(2)-Co(OH)(2) composites have different structures depending on the amount of Co(OH)(2) in Ni(OH)(2). The nickel hydroxide synthesized from a water-acetone 0.1 M Ni(NO3)(2)center dot 6H(2)O solvent has a compact structure, but that from a 0.1 M Ni(NO3)(2)center dot 6H(2)O solvent containing 5% Co(NO3)(2)center dot 6H(2)O is loosely packed with nanoparticles and that from a 0.1 M Ni(NO3)(2) center dot 6H(2)O solvent containing 10% Co(NO3)(2) center dot 6H(2)O contains many nanoparticles. Addition of Co(NO3)(2) center dot 6H(2)O results in a smooth morphology. The smooth structure is also observed from active materials produced in 20% and 30% Co(NO3)(2) center dot 6H(2)O solvents. Five types of electrode materials are investigated from the perspective of electrochemical capacitors by conducting cyclic voltammogram, galvanostatic charge-discharge measurements, and electrochemical impedance spectroscopy. In this experiment, the highest specific capacitance of 7.8 F cm(-2) is achieved in the samples prepared in 10% Co(NO3)(2) center dot 6H(2)O at a discharge current density of 20 mA cm (2). It is much better than 1.46 F cm (2) observed from previous attempts and the materials have excellent capacity retention. (C) 2013 Elsevier B.V. All rights reserved.
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