Journal
ELECTROCHIMICA ACTA
Volume 58, Issue -, Pages 231-237Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.09.043
Keywords
Water electrolysis; EQCM; Intercalation; Adsorption; Phosphoric acid
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Funding
- European Union [212903]
- Department of Materials Science and Engineering at NTNU
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The rate of the oxygen evolution reaction (OER) at anodically formed iridium oxide and nano-crystalline iridium oxide powder is significantly lower in phosphoric acid and sulphuric acid solutions than in perchloric acid solutions in the temperature range 0-150 degrees C. The results are interpreted as due to strong adsorption of phosphate on the oxide blocking active sites for intermediates in the OER by phosphoric acid moieties. Anions also appear to be involved in the intercalation processes of both forms of the oxide. The mass changes observed for oxide powder during intercalation in phosphoric acid were twice those in perchloric acid. (C) 2011 Elsevier Ltd. All rights reserved.
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