Electrocatalytic oxidation of methanol on poly(vinylferrocene) modified Pt electrode
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Publication Details
Output type: Journal article
Author list: Akgul E, Gulce A, Gulce H
Publisher: Elsevier
Publication year: 2012
Journal: Journal of Electroanalytical Chemistry (1572-6657)
Volume number: 668
Start page: 73
End page: 82
Number of pages: 10
ISSN: 1572-6657
Languages: English-Great Britain (EN-GB)
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Abstract
Electrooxidation of methanol have been studied on the poly(vinylferrocene) (PVF) coated Pt substrate electrode and uncoated Pt substrate electrode in aqueous HClO4 solutions and the results have been compared. The effects of various parameters such as polymeric films thickness, potential scan rates, methanol concentration and media temperature on the electrooxidation of methanol have been investigated. The results have showed that the current values obtained for the electrooxidation of methanol have been up to 19 times higher than the current values obtained with bare Pt substrate under the same conditions. The E-a values for forward scan oxidation of methanol at PVF coated Pt substrate and Pt substrate electrode have been found to be 8.2 kJ mol(-1) and 32.7 kJ mol(-1), respectively. The E-a values for reverse scan oxidation at the PVF coated Pt substrate and Pt substrate electrode have also been calculated as 21.7 kJ mol(-1) and 49.8 kJ mol(-1). respectively. The E-a values for the PVF coated Pt substrate electrode are lower than Pt substrate electrode for methanol electrooxidation indicating that electrocatalytic activity of PVF. Electrooxidation of methanol in this system shows no significant effects of site poisoning by chemisorbed CO. Furthermore, our results suggest that the important role of OH chemisorbed onto polymer matrix in electrocatalysis of methanol on modified electrode. The catalytic efficiency of PVF towards oxidation of methanol has been determined and it has been found to be higher than 100% at all scan rates. The results suggest that the electrooxidation of methanol proceeds on the PVF modified Pt substrate electrode with good catalytic efficiency. Chronoamperometry experiments have been also confirmed electrocatalytic performance of the PVF coating. (C) 2012 Elsevier B.V. All rights reserved.
Keywords
Electrocatalysis, Electrooxidation of methanol, Modified electrodes, Poly(vinylferrocene)
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