Kinetic and mechanistic study of methanol oxidation on a Pt(110) surface in alkaline media

• Published in: Electrochimica acta Vol. 44; no. 6; pp. 1135 - 1145
• Main Authors: TRIPKOVIC, A. V, POPOVIC, K. D, MOMCILOVIC, J. D, DRAZIC, D. M
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01-01-1998; Elsevier
• Subjects: Alkaline solutions; Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Kinetics and mechanism of reactions; Methanol oxidation; OH − ion electrosorption; Pt electrode; Reaction mechanism; Alkaline solutions; Reaction mechanism; OH − ion electrosorption; Methanol oxidation; Pt electrode; Crystal orientation; Basic solution; Electrode poisoning; Transition metal; Experimental study; Primary alcohol; Hydrogencarbonates; Electrodes; Platinum; Sodium Hydroxides; Oxidation; Carbonates; Kinetics; Electrochemical reaction; Organic compounds; Methanol
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(98)00216-3

The comparative study of methanol oxidation on a Pt(110) surface was carried out in bicarbonate, carbonate and sodium hydroxide solutions. It was shown that OH
− electrosorption precedes the oxide layer formation in sodium hydroxide solution and is coupled by HCO
3
− and CO
3
2− electrosorption in the corresponding media. Adsorbed bicarbonates suppressed the methanol oxidation. The surface activity was correlated to the OH
ad species coverage. Coverage with `poisoning species' formed during methanol oxidation is time dependent. The dual path mechanism for methanol oxidation on the Pt(110) surface, as well as for the other low-index planes, was proposed based on the assumptions that HCO
ad and OH
ad are reactive intermediates and that formate is the reaction product in the main path, while CO
2 is a product of `poisoning species' oxidation in a parallel reaction path.