Chloride inhibition of ethanol electrooxidation at a platinum electrode in aqueous acid solution

✍ Scribed by K.D. Snell; A.G. Keenan

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 654 KB
• Volume: 26
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(81)85119-5

✦ Synopsis

Abstlrct

-The efkt of adsorbed chloride ion on the ekctrooxidation of eCbnol aI a platinum electrode in OSM H,SO, at 25°C has been studied in order 10 determine if adsorbed species arc important in this electraoxidation. The cyclic voltammogram for this system exhibits three anodic waves, one of which is unusual in that it occurs during the cathodic going potential sweep. The data indicate that adsorbed species arc involved in all three waves. Mechanisms proposed in the literature for ethanol eleotrooxidation are discussed in terms of these results. The most likely mechanism for the-first wave during the anodic going potential sweep includes a chemical reaction between chemisorbed CH,CHOH and OH*, while a reaction between CH,CH,OH,,j and PtO is involved in the second wave. The cathodic going potential sweep wave is acounted for by the ekctrooxidation of CH,CH,OH,ds, on a surface free of oxide and chcmisorbed Spscies.