Capacitance decay of nanoporous nickel hydroxide

• Published in: Journal of power sources Vol. 195; no. 19; pp. 6977 - 6981
• Main Authors: Hu, Guangxia, Li, Chunxiang, Gong, Hao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2010; Elsevier
• Subjects: Applied sciences; Capacitance decay; Capacitors. Resistors. Filters; Electrical engineering. Electrical power engineering; Exact sciences and technology; High current density; Nanoporous nickel hydroxide; Phase change; Supercapacitor; Various equipment and components; Supercapacitor; Capacitance decay; High current density; Phase change; Nanoporous nickel hydroxide; High density; Nanoporous materials; Electrolytic capacitor; Phase transformation; Nickel hydroxide; High current; Capacitance; Current density
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2010.03.093

Nanoporous nickel hydroxide Ni(OH) 2 coated on nickel foam by using a chemical bath deposition method shows a high specific capacitance of 2200 F g −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.