Voltammetric discharge efficiency of nickel hydroxide electrodes chemically precipitated on a platinum substrate

✍ Scribed by M.V. Vazquez; G.F. Darbyshire; R.E. Carbonio; V.A. Macagno

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 857 KB
• Volume: 25
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(89)80123-5

✦ Synopsis

The discharge and deposition efficiencies of nickel hydroxide electrodes chemically precipitated on platinum substrates were measured using cyclic voltammetry. These efficiencies depend on the concentration of the precipitating solutions, the thickness of the film, and the concentration of the electrolyte. The temperature of the precipitating solutions has a significant influence on the deposition efficiency but not on the discharge efficiency. Changes in the discharge efficiency are mainly analyzed in terms of changes in the morphology and physical structure of the nickel hydroxide film at the substrate/nickel hydroxide interphase. Discharge efficiencies, based on one electron per nickel ion, as large as 130% are obtained at very low concentrations of precipitating solutions. On the other hand, extremely low discharge efficiencies are obtained with highly concentrated precipitating solutions.