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The influence of Ir and Pt1Ir1 structure in metallic multilayers nanoarchitectured electrodes towards ethylene glycol electro-oxidation

Lookup NU author(s): Professor Paul Christensen

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Abstract

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.


Publication metadata

Author(s): Freitas RG, Antunes EP, Christensen PA, Pereira EC

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2012

Volume: 214

Pages: 351-357

Print publication date: 15/09/2012

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.jpowsour.2012.04.099

DOI: 10.1016/j.jpowsour.2012.04.099


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Funding

Funder referenceFunder name
CAPES
CNPq
School of Chemical Engineering and Advanced Materials, Newcastle University
03/09933-8FAPESP
10/05555-2FAPESP

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