Abstract
Ti-supported IrO 2( x) + MnO 2(1 − x) coatings were prepared by thermal decomposition of a mixture of H 2IrCl 6 and Mn(NO 3) 2 dissolved in hydrosolvent. The nature and oxygen evolution reaction (OER) mechanism of the IrO 2 + MnO 2 electrodes in 0.5 M H 2SO 4 solution was studied by EIS measurements, emphasizing on the influence of coating composition, preparation temperature and the reaction potential. A mathematical simulation of experimental EIS data was carried out based on one state-variable theory. The simulated numerical number deduced the IrO 2( x) + MnO 2(1 − x) coating nature and oxygen evolution reaction mechanism during the process of O 2 evolution. The inner relationships of coating nature with coating composition, and preparation temperature, the reaction potential, were analyzed and founded by these parameters of the R s, R f, C f, R ct and C dl. The C dl and 1/ R ct parameters have the high reliability in measuring the electrochemical activity of the IrO 2( x) + MnO 2(1 − x) oxide electrodes for OER, which can extend to that of other oxide electrodes.
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