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Oxidation of hydroxide to oxygen at an electrode modified with a film containing palladium and iridium oxides
Author(s) -
Cox James A,
Jaworski Robert K.,
Das Basudev K.
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020808
Subject(s) - saturated calomel electrode , tafel equation , inorganic chemistry , iridium , chemistry , palladium , hydroxide , electrode , glassy carbon , reference electrode , oxide , electrocatalyst , rotating disk electrode , analytical chemistry (journal) , cyclic voltammetry , electrochemistry , catalysis , organic chemistry
Abstract Hydroxide is oxidized to oxygen at 0.7 V versus a saturated calomel electrode in a pH 11 solution at a glassy carbon electrode modified with a film containing palladium and iridium oxide. Although this converts to a value that is among the lowest of the reported overpotentials for this reaction, the utility for large‐scale electrolyses is limited by the need to periodically reactivate the surface with an acid treatment. The reaction, however, has considerable promise for electroanalytical chemistry. Voltammetric working curves in the millimolar range are linear at slow scan rates; at 40 mV/s, the sensitivity is 241 mA/mol. The current is mass transport limited at a rotating disk electrode. A general mechanism, proposed in part on the basis of a Tafel plot, is presented.