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Lookup NU author(s): Professor Paul ChristensenORCiD
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This paper presents a study of the electro-oxidation of ethylene glycol (EG) at metallic multilayer electrodes: Pt-pc/Ir-x/Pt-y (Pt-pc = polycrystalline Pt. x and y denote the number of monolayers of Ir intralayer and Pt outer layer, respectively) and Pt-pc/(Pt1Ir1)(x)/Pt-y (ie a 1:1 alloy of Pt and Ir was employed as intralayer). For comparison, data are also presented for Pt-pc. Although Pt and It have similar crystallographic structures, the work reported shows for the first time that the electrocatalytic properties of the Pt outer layer are affected significantly by the composition of the intralayer. The voltammetry data show that the Pt-pc/Ir-3.0/Pt-3.0 metallic multilayer electrode exhibits a peak current density 78% higher than that observed using Pt-pc, in agreement with activation energy measurements on the electro-oxidation of EG which showed: Pt-pc/Ir-3.0/Pt-3.0 (26 kJ mol(-1)) < Pt-pc (44 kJ mol(-1)) < Pt-pc/(Pt1Ir1)(3.0)/Pt-3.0 (46 kJ mol(-1)). The FTIR experiments showed that the main products for the oxidation of the dial at the electrodes are similar: COL, CO2 and glycolic and/or oxalic acid over Pt-pc and Pt-pc/Ir-3.0/Pt-3.0 metallic multilayer electrodes. However, significantly more CO2 and COL were observed at Pt-pc/Ir-3.0/Pt-3.0 compared to Pt-pc electrodes. (C) 2012 Elsevier B.V. All rights reserved.
Author(s): Freitas RG, Antunes EP, Christensen PA, Pereira EC
Publication type: Article
Publication status: Published
Journal: Journal of Power Sources
Print publication date: 15/09/2012
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
Publisher: Elsevier BV
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