Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 29, Issue 8, Pages 791-797Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2003.09.007
Keywords
oxygen evolution reaction; IrO2; Tafel lines; impedance; mechanistic aspects
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The oxygen evolution reaction (OER) on IrO2-Ta2O5 mixed oxide electrodes in H2SO4 solution was studied by performing quasi-stationary current-potential and electrochemical impedance spectroscopy (EIS) measurements. The uncompensated resistance corrected Tafel lines displayed two distinct linear regions, with one of the slope close to 60 mV dec(-1) in the low potential region and the other close to 130 mV dec(-1) in the high potential region. The kinetics equations based on the proposed OER mechanism were derived and were used to simulate the current-potential curve. A mathematical deduction of EIS data was also carried out based on one state-variable theory. Both the polarization curve and impedance spectra were well approximated by kinetics analysis. (C) 2003 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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