Effect of particle size on the electrochemical capacitance of α-Ni(OH)2 in alkali solutions

M. Jayalakshmi, M. Mohan Rao, Kwang Bum Kim

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29 Citations (Scopus)

Abstract

Effect of nanosized particles of α-Ni(OH)2 in enhancing the electrochemical capacitance as against the microsized particles of the same hydroxide is examined. Nanomaterial was synthesized by hydrothermal method while the micromaterial was prepared by the conventional co-precipitation method. Material characterization was done by XRD, TEM and BET surface area. Electrochemical characterization was carried out by cyclic voltammetry in alkali solutions. The BET surface areas of of nano- and micro-sized α-Ni(OH)2 were shown to be directly proportional to their specific electrochemical capacitance (both faradic and non-faradic) as evident from the values of 20.9 m2g-1, 289.8 Fg-1 and 9.2 m2g-1, 133.6 Fg-1 respectively. Apart from inter-grain conduction, smaller particles increase the shift of conduction and valence band leading to a greater charge separation. An attempt to understand the particle size effect on the enhancement of electrochemical capacitance based on the volume and surface recombination of oppositely charged particles was made.

Original languageEnglish
Pages (from-to)324-333
Number of pages10
JournalInternational Journal of Electrochemical Science
Volume1
Issue number6
Publication statusPublished - 2006 Dec 1

All Science Journal Classification (ASJC) codes

  • Electrochemistry

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