Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 41, Issue 9, Pages 933-939Publisher
PLEIADES PUBLISHING INC
DOI: 10.1007/s11175-005-0159-z
Keywords
electrodeposition; oxides of molybdenum and manganese; evolution of oxygen
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The manganese dioxide anodes modified by molybdenum compounds exhibit selectivity with respect to the oxygen evolution reaction in a 0.5 M solution of sodium chloride at pH 7.0. When depositing an active material, at first a sublayer of a noble metal is created at the surface of titanium. The task of the sublayer is usually reduced to the creation of a conducting sublayer that would hinder the passivation of titanium. Such a sublayer can be created from both iridium dioxide and platinum oxides that are produced by thermolysis of proper salts. The kinetics of the oxygen evolution reaction in a 0.5 M solution of sodium sulfate on these oxides is substantially different. Specifically, the oxygen evolution process at IrO2 is characterized by a substantially lower overvoltage and more pronounced reversibility. Selective evolution of oxygen out of 0.5 M solutions of sodium chloride may be reached both on the basis of an anode with a sublayer of iridium dioxide and with a sublayer of platinum oxides. The surface of the obtained electrodes is enriched by molybdenum compounds.
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