The Capacitive Behavior of Ni_0.76Co_0.24O_x Xerogels in KOH Solution

Abstract:

Ni_0.76Co_0.24O_x xerogels were formed by the sol-gel method followed by heat-treatment in air. The structure and properties of these materials were characterized by using X-ray diffraction, TEM and N2 (77K) adsorption. Electrodes with the xerogels were activated by cyclic voltammetry (CV) and their capacitive performance was evaluated by galvanostatic technique in 7 mol/L KOH solutions. A maximum specific capacitance of 904 F/g was obtained by constant current discharge with a current density of 2.0 mA/cm² for the Ni_0.76Co_0.24O_x xerogels heat-treated at 250°C. High performance obtained indicates that these materials are promising electrode materials for supercapacitors.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 1092-1096
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.1092
• Online since: December 2012
• Authors: Jie Cheng, Xin Jin Tian, Yue Hua Wen, Yan Xu, Han Min Liu, Gao Ping Cao, Yu Sheng Yang
• Keywords: Cyclic Voltammetry (CV), Galvanostatic Technique, Ni_0.76Co_0.24O_x Xerogels, Super-Capacitor (SC)

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