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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Freitas, R. G. [1, 2] ; Antunes, E. P. [1] ; Christensen, P. A. [2] ; Pereira, E. C. [1]
Total Authors: 4
Affiliation:
[1] Univ Fed Sao Carlos, NANOFAEL LIEC Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[2] Newcastle Univ, Sch Chem Engn & Adv Mat, Newcastle Upon Tyne NE1 7RU, Tyne & Wear - England
Total Affiliations: 2
Document type: Journal article
Source: Journal of Power Sources; v. 214, p. 351-357, SEP 15 2012.
Web of Science Citations: 6
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. (AU)

FAPESP's process: 10/05555-2 - Electrochemical investigation of TiO2-nanotubes formation and its application on energy convertion nanostructured systems
Grantee:Renato Garcia de Freitas Sobrinho
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 03/09933-8 - Center for Excellence in Electrochemically Synthesized Nanostructures
Grantee:Ernesto Chaves Pereira de Souza
Support Opportunities: PRONEX Research - Thematic Grants