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Electrochemical preparation of cobalt oxide using an autoclave electrolytic cell

Published online by Cambridge University Press:  31 January 2011

Michio Koinuma ,
Tomohiko Hirae  and
Yasumichi Matsumoto
Michio Koinuma
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kumamoto University, Kurokami 2–39–1, Kumamoto 860, Japan
Tomohiko Hirae
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kumamoto University, Kurokami 2–39–1, Kumamoto 860, Japan
Yasumichi Matsumoto
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kumamoto University, Kurokami 2–39–1, Kumamoto 860, Japan
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Abstract

Polycrystalline films of cobalt oxides (Co3O4 and CoOOH) with and without Sm were fabricated on platinum substrates by electrochemical oxidation in an autoclave. The cobalt oxides were directly crystallized at temperatures higher than about 100 °C during electrolysis. The composition of the cobalt oxides strongly depended on the electrode potential; i.e., Co3O4 and CoOOH were formed in non-noble and relatively noble potential regions, respectively. When Sm was incorporated in the CoOOH by the electrolysis in solutions containing Sm3+, only the c lattice constant was increased due to an expansion in the layer structure.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 837 - 839
Copyright
Copyright © Materials Research Society 1998

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References

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