Pd-based catalysts: Influence of the second metal on their stability and oxygen reduction activity

Autor(es)

Pires, F. I. ^[1] ; Villullas, H. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Dept Quim Fis, Inst Quim, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 37, n. 22, p. 17052-17059, NOV 2012.
• Citações Web of Science: 41

Resumo

PdM/C nanocatalysts (M = Ni, Fe and Co) were prepared by a polyol method varying nominal composition and reflux time. XRD studies revealed the presence of uniform strain as well as formation of an alloyed PdM phase and small crystallite size (around 2-3 nm). Accelerated stability tests showed that all catalysts prepared in this work are considerably more stable than Pd/C, at the time that demonstrated that stability depends on the second metal and follows the order PdNi > PdFe > PdCo. Studies of the oxygen reduction reaction showed that for each second metal the material with nominal composition Pd:M 70:30 prepared with reflux time of 30 min was the most active, following the order PdFe/C > PdCo > PdNi. The study of methanol tolerance showed that all the samples are inactive for methanol oxidation. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/06538-7 - Novas estratégias no desenvolvimento de catalisadores para células a combustível: métodos avançados de síntese e técnicas on line e in situ no estudo da atividade catalítica
• Beneficiário: Hebe de las Mercedes Villullas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/54434-0 - Preparacao e caracterizacao de nanoparticulas metalicas e bimetalicas coloidais para eletrocatalise - parte ii.
• Beneficiário: Hebe de las Mercedes Villullas
• Modalidade de apoio: Auxílio à Pesquisa - Regular