Electrode with electrocatalytic surface
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United States of America Patent
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Jul 9, 1985
Issued Date -
N/A
app pub date -
Jun 23, 1983
filing date -
Aug 18, 1980
priority date (Note) -
Expired
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Abstract
An electrode for use in electrolytic processes comprises a base of film-forming metal such as titanium with an operative outer electrocatalytic surface which is an integral surface film of a compound of the titanium base, usually the oxide, incorporating a platinum-group metal electrocatalyst, preferably iridium, rhodium, palladium and/or ruthenium as metal or oxide. The surface film is formed by the application of a dilute solution of a thermodecomposable iridium, rhodium and/or ruthenium compound containing an agent such as HCl which attacks the titanium base and converts metal from the base into ions which are converted to the compound in a subsequent heating step. The concentrations of this agent and of the thermodecomposable compound and the number of applied layers are such that during heating the electrocatalyst formed from the decomposed compound is incorporated fully in the surface film formed from the base. The base is usually in sheet form, but may also be a powder.
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