The Mechanism for Ethanol Oxidation Reaction on SnO_2@Pt/C Core Shell Electrocatalyst

摘要

In the present work we investigated the products distributions from ethanol oxidation reaction (EOR) in acid solutions using SnO_2@Pt/C core-shell, PtSn/C E-TEK and Pt/C E-TEK as electrocatalysts assisted by "in situ" ATR-FTIR technique to obtain information about EOR mechanism on these materials. All materials used were 20% (w/w) metal on carbon XC 72-R. From "in situ" ATR-FTIR experiments with ethanol 1.0 mol L~(-1) it can be seen that the SnO_2@Pt/C material led to CO_2 formation in great proportion, while that, in Pt/C E-TEK acetic acid and acetaldehyde were the main products. In the chronoamperometry experiments at 0.5 V (vs RHE), the mass current density for ethanol oxidation was higher using SnO_2@Pt/C when compared to Pt/C and PtSn/C E-tek.