Capacitive Study of Ni(OH)₂ Xerogels in KOH Solution

Abstract:

Ni(OH)₂ xerogels were formed by sol-gel method at 80 °C followed drying at 110 °C and ambient pressure. The structure of Ni(OH)₂ xerogels was characterized using X-ray diffraction, transmission electron microscope (TEM) and N₂ (77K) adsorption. X-Ray Diffraction (XRD) results showed that the material obtained has a crystalline -Ni(OH)₂. TEM images showed that average size of the crystalline phase is about 10 nm. Results of N2 (77K) adsorption isotherm showed that the (BET) specific surface area is 232 m²/g and the Pore size distribution is in the regime 1-4 nm (Barrett–Joyner–Halenda, BJH). The Ni(OH)₂ xerogels electrodes were activated using cyclic voltammetry, and their capacitive performance was evaluated using cyclic voltammetry (CV) and constant current discharge. The Ni(OH)₂ xerogels electrodes exhibited excellent capacitive behavior with a specific capacitance of 635 F/g (calculated by CV). High performance obtained indicates that the Ni(OH)₂ xerogels are promising electrode materials for supercapacitors, and the electrochemical activation of these electrodes is doable.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 1106-1110
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.1106
• Online since: December 2012
• Authors: Xin Jin Tian, Jie Cheng, Yue Hua Wen, Gao Ping Cao, Han Min Liu
• Keywords: Cyclic Voltammetry (CV), Galvanostatic Technique, Ni(OH)₂ Xerogels, Super-Capacitor (SC)

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