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 language | English |
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Pages (from-to) | 295-300 |
Number of pages | 6 |
Journal | International Journal of Hydrogen Energy |
Volume | 27 |
Issue number | 3 |
DOIs | |
Publication status | Published - 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