Abstract
Parallel reaction pathways are possible during ethanol electro-oxidation at un-supported platinum nanoparticles. In the present paper, the effect of the base electrolyte namely HClO4 (0.1 mol L-1) and H2SO4 (0.5 mol L-1) is reported for ethanol (0.01 mol L-1)electro-oxidation. Electrochemical studies and in situ FTIR showed lower catalytic activity for the oxidation in H2SO4 than in HClO4 for 0.01 mol L-1 ethanol. This indicates that the strong adsorption of sulfate in (111) domains inhibits the dissociative adsorption of ethanol. This is evidenced by in situ FTIR where it is noted the emergence of the COads (COL 2040 cm-1) band at 0.05 V in perchloric, and only at 0.4 V in sulfuric media. The oxidation of 0.01 mol L-1 ethanol follows only the CO2 pathway in the two acid electrolytes.
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