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Early stages in the oxidation of ethanol at low index single crystal platinum electrodes

1997; Elsevier BV; Volume: 437; Issue: 1-2 Linguagem: Inglês

10.1016/s0022-0728(97)00404-x

1873-2569

Xing‐Hua Xia, Hans-Dieter Ließ, T. Iwasita,

Electrochemical Analysis and Applications

Conventional electrochemical methods and in situ FTIR spectroscopy have been applied to study the early stages for adsorption oxidation of ethanol at Pt(111), Pt(110), and Pt(100). Spectroscopic results show that the electrooxidation of ethanol on all three surf is characterised by the formation of acetaldehyde, acetic acid and carbon dioxide as soluble products. Linearly and bridge bonded CC identified as adsorbed species. At Pt(110) other surface species containing CH and COH bonds are observed. In the hydrogen region the Pt(100) surface, the interconversion between bridge and linearly bonded CO, turns out to be a common feature during electrooxidation of small organic molecules. The important role played by adsorbed water is discussed. Adsorption of ethanol is the determining step.