Abstract
In-situ Fourier transform IR (FTIR) reflectance spectroscopy has been used to study the electroadsorption and oxidation of ethanol at polycrystalline Ir and Rh electrodes in HClO 4 solutions. The formation of surface and solution species has been followed optically during slow voltammetric scans. Ethanol electroadsorption leads to the formation of linearly bonded and bridge-bonded CO on Rh surfaces but only to linearly bonded CO on Ir. In the oxidation potential region, Ir electrodes show different catalytic properties from Rh electrodes, with Ir being a more selective catalyst than Rh. Oxidized states at early potentials play an activating role in ethanol electro-oxidation. Acetaldehyde is probably an intermediate product, but the major product on Ir electrodes is acetic acid whereas CO 2 is the main product at Rh electrodes.
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