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헥사메틸렌테트라민 농도에 따른 수산화니켈 입자의 특성 분석 및 의사커패시터 응용

Title
헥사메틸렌테트라민 농도에 따른 수산화니켈 입자의 특성 분석 및 의사커패시터 응용
Translated Title
The Effects of Hexamethylenetetramine Concentration on the Structural and Electrochemical Performances of Ni(OH)2 Powder for Pseudocapacitor Applications
Authors
김동연정영민백성호손인준
DGIST Authors
정영민; 백성호
Issue Date
2019-06
Citation
한국분말야금학회지, 26(3), 231-236
Type
Article
Article Type
Article
Author Keywords
PseudocapacitorNickel hydroxideElectrodepositionHexamethylenetetramineCathodic current
ISSN
1225-7591
Abstract
Ni hydroxides (Ni(OH)2) are synthesized on Ni foam by varying the hexamethylenetetramine (HMT) concentration using an electrodeposition process for pseudocapacitor (PC) applications. In addition, the effects of HMT concentration on the Ni(OH)2 structure and the electrochemical properties of the PCs are investigated. HMT is the source of amine-based OH− in the solution; thus, the growth rate and morphological structure of Ni(OH)2 are influenced by HMT concentration. When Ni(OH)2 is electrodeposited at a constant voltage mode of -0.85 V vs. Ag/AgCl, the cathodic current and the number of nucleations are significantly reduced with increasing concentration of HMT from 0 to 10 mM. Therefore, Ni(OH)2 is sparsely formed on the Ni foam with increasing HMT concentration, showing a layered double-hydroxide structure. However, loosely packed Ni(OH)2 grains that are spread on Ni foam maintain a much greater surface area for reaction and result in the effective utilization of the electrode material due to the steric hindrance effect. It is suggested that the Ni(OH)2 electrodes with HMT concentration of 7.5 mM have the maximum specific capacitance (1023 F/g), which is attributed to the facile electrolyte penetration and fast proton exchange via optimized surface areas.
URI
http://hdl.handle.net/20.500.11750/10298
DOI
10.4150/KPMI.2019.26.3.231
Publisher
한국분말야금학회
Related Researcher
Files:
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Collection:
ETC1. Journal Articles


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