Microvoltammetric study of electrochemical properties of a single spherical nickel hydroxide particle

Ho Sung Kim, T. Itoh, M. Nishizawa, M. Mohamedi, M. Umeda, I. Uchida

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Electrochemical studies of spherical nickel hydroxide Ni(OH)2 with high density were carried out by using a microelectrode technique. A carbon fiber microelectrode was contacted with a single particle of nickel hydroxide in 5 M KOH aqueous solution. In this way, cyclic voltammetry and galvanostatic charge/discharge experiments were carried out. The Ni(OH)2/NiOOH redox reaction, oxygen evolution reaction and charge/discharge capacity were examined without any dilution with a binder and a conductive additive. Data were compared with those of the composite electrode consisting of the nickel hydroxide particle and a polymer binder, which is the practical form in the Ni-MH batteries. The potential-step technique was also performed to evaluate the apparent chemical diffusion coefficient of the proton (Dapp) in the nickel hydroxide. Since the nickel hydroxide particle was a dense, conductive sphere, the spherical diffusion model was employed for the analysis. The Dapp was found to be around 10-9 cm2 s-1.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume27
Issue number3
DOIs
Publication statusPublished - 2002 Mar

Keywords

  • Diffusion coefficient
  • Microelectrode
  • Nickel hydroxide
  • Single particle

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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