Journal
ELECTROCHIMICA ACTA
Volume 52, Issue 13, Pages 4560-4565Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.12.066
Keywords
rhodium; anion adsorption; surface oxide; electrochemical dissolution; cyclic voltammetry; electrochemical quartz crystal microbalance
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Electrochemical behavior of thin polycrystalline Rh layers has been studied in 0.5 M H2SO4 solution by cyclic voltammetry (CV) and the electrochemical quartz crystal microbalance (EQCM). The properties of surface oxide formed on freshly electrodeposited Rh are different than on electrochemically aged Rh. The analysis of frequency changes in both hydrogen and oxygen regions is presented. It is suggested that hydrogen desorption occurs simultaneously with the adsorption of HSO4- ions, whose maximum surface coverage reaches ca. 8%. The EQCM results indicate that RhO is the main species formed during Rh surface oxidation. Metal dissolution proceeds during electrode cycling to sufficiently high potentials. The amount of dissolved metal increases with an increase in potential and a decrease in scan rate. (c) 2007 Elsevier Ltd. All rights reserved.
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