Capacitance decay of nano porous nickel hydroxide

被引:161
作者
Hu, Guangxia [1 ]
Li, Chunxiang [2 ]
Gong, Hao [1 ]
机构
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119260, Singapore
[2] Singapore Polytech, Ctr Adv Mat Technol, Singapore 139651, Singapore
关键词
Nanoporous nickel hydroxide; Capacitance decay; High current density; Supercapacitor; Phase change; THIN-FILMS; ELECTRODE;
D O I
10.1016/j.jpowsour.2010.03.093
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanoporous nickel hydroxide Ni(OH)(2) coated on nickel foam by using a chemical bath deposition method shows a high specific capacitance of 2200 Fg(-1) at a discharging current density of 1 Ag-1. After 500 charge-discharge cycles, the specific capacitance is stabilized at 1470 Fg(-1), and there is only a 5% fall in specific capacitance during the following 1500 cycles. The relationship between the capacitance decay and changes in the microstructure and morphology of nanoporous Ni(OH)(2) is investigated. The results show that phase transformation and the growth of particle/crystal size, rather than the formerly proposed flaking off of Ni(OH)(2), are the major factors contributing to the capacitance decay. (C) 2010 Published by Elsevier B.V.
引用
收藏
页码:6977 / 6981
页数:5
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