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DOI: 10.1039/A807000H (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 961-963

Electrochemical synthesis of α-cobalt hydroxide

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R. S. Jayashree and P. Vishnu Kamath

Abstract

Cathodic reduction of an aqueous solution of cobalt nitrate at low pH, high Co(II) ion concentration (≥1 M) and low current densities (<0.3 mA cm–2) leads to the formation of a novel layered hydroxide of Co(II) with an interlayer spacing of 8.93 Å. This hydroxy deficient phase is structurally and compositionally related to α-nickel hydroxide, but likely contains Co(II) ions in a mixed octahedral/tetrahedral coordination. Under other deposition conditions, the better known β-cobalt hydroxide (a=3.17±0.01 Å, c=4.61±0.02 Å) is obtained.

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