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Journal of Electroanalytical Chemistry, Vol.432, No.1-2, 1-5, 1997
The Role of Surface Crystalline Heterogeneities in the Electrooxidation of Carbon-Monoxide Adsorbed on Rh(111) Electrodes in Sulfuric-Acid-Solutions
The electrooxidation of CO saturated adlayers has been studied on three different rhodium electrodes : Rh(111), Rh(554) and electrochemically disordered Rh(111). It has been found that the kinetics of the CO stripping process is sensitive to the long-range order of the (111) domains. The more ordered the surface, the slower the oxidation proceeds. This provides a criterion for the assessment of the surface quality. It is noteworthy that the Rh(111) blank voltammogram does not show significant changes upon structural modification of the electrode surface : the voltammetric profiles for Rh(111) and Rh(554) in 0.5 M sulphuric acid are virtually identical.
Keywords:SCANNING-TUNNELING-MICROSCOPY;INFRARED-SPECTROSCOPY;RH 111;VOLTAMMETRY;RHODIUM(100);PERCHLORATE;ADSORPTION;BEHAVIOR;PT(111)