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

Autor(es)

Freitas, R. G. ^{[1, 2]} ; Antunes, E. P. ^[1] ; Christensen, P. A. ^[2] ; Pereira, E. C. ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 214, p. 351-357, SEP 15 2012.
• Citações Web of Science: 6

Resumo

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)

• Processo FAPESP: 10/05555-2 - Investigação da formação eletroquímica de nanotubos-TiO2 e sua aplicação em sistemas conversores de energia nanoarquiteturados
• Beneficiário: Renato Garcia de Freitas Sobrinho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 03/09933-8 - Núcleo de Excelência em Materiais Nanoestruturados Fabricados Eletroquimicamente
• Beneficiário: Ernesto Chaves Pereira de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático