Effect of iron on the electrochemical properties of the nickel hydroxide electrode

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054797· OSTI ID:7039004

Demourgues-Guerlou, L; Delmas, C ^[1]

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1. Univ. Bordeaux, Talence (France). Lab. de Chimie du Solide du CNRS

New hydrated iron-substituted nickel hydroxides obtained either by precipitation ([alpha]) or by chimie douce ([alpha]) have been tested as positive electrode materials in Ni/Cd cells. The [gamma]/[alpha] system is completely stabilized during long-term electrochemical cycling as a result of the stability of the Fe[sup 3+] ions in the reduced variety. Moreover, the substitution of iron results in a noticeable increase in the cell voltage, which can be correlated with the strong oxidizing character of the [gamma] oxidized phases due to the presence of tetravalent iron ions. The competition between electrolyte decomposition and effective oxidation of the electrode material leads to a decrease of the changeability, which is all the more pronounced as the iron concentration becomes higher. The electrochemical behavior of these iron-substituted materials is discussed with regard to previous observations in the laboratory for the homologous cobalt phases.

• OSTI ID: 7039004
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:3; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250902* -- Energy Storage-- Batteries-- Performance & Testing
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METAL COMPOUNDS
CATALYTIC EFFECTS
CHEMISTRY
COBALT
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
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METAL-METAL OXIDE BATTERIES
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NICKEL HYDROXIDES
NICKEL-CADMIUM BATTERIES
OXYGEN COMPOUNDS
PERFORMANCE
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS