PtSnNi/C nanoparticle electrocatalysts for the ethanol oxidation reaction: Ni stability study

Autor(es)

Parreira, Luanna Silveira ^[1] ; Martins da Silva, Julio Cesar ^[1] ; D'Villa -Silva, Melina ^[1] ; Simoes, Fernando Carmona ^[1] ; Garcia, Samara ^[1] ; Gaubeur, Ivanise ^[1] ; Liutheviciene Cordeiro, Marco Aurelio ^[2] ; Leite, Edson Roberto ^[2] ; dos Santos, Mauro Coelho ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, CCNH Ctr Ciencias Nat & Humanas, Lab Eletroquim & Mat Nanoestruturados, BR-09210170 Santo Andre, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 96, p. 243-252, APR 30 2013.
• Citações Web of Science: 26

Resumo

This work describes the use of Pt3Sn/C, Pt3Ni/C and Pt3SnNi/C nanoparticle electrocatalysts with a 20% metal loading on carbon prepared using the polymeric precursor method for the ethanol oxidation reaction (EOR). XRD measurements revealed the presence of segregated Pt and NiO phases in the Pt3Ni/C electrocatalysts, whereas for Pt3SnNi/C, there was some evidence that Ni and Sn atoms are incorporated into the Pt structure with the presence of segregated SnO2 and NiO phases. The mean crystallite sizes were 3.6, 5.7 and 7.2 nm for Pt3Sn/C, Pt3Ni/C, and Pt3SnNi/C, respectively. The onset oxidation potential obtained for the EOR using Pt3SnNi/C was close to 0.22V. Chronoamperometric measurements revealed that the highest current densities for the EOR were obtained using the Pt3SnNi/C nanoparticle electrocatalysts (16 mA mg(Pt)(-1)). Based on the Ni accelerated stress tests, this element was more stable in the ternary material. In contrast, there was a change in the product formation pathways before (acetaldehyde and acetic acid were the primary products) and after the accelerated stress tests (acetaldehyde was the primary product) for the Pt3SnNi/C catalyst. The experimental results indicate that the Pt3SnNi/C electrocatalysts exhibited better electrocatalytic activity compared to the other electrocatalysts for the EOR. It is suggested that this activity is related to the presence of Ni, which can modify the electronic structure of Pt and combine with Sn to facilitate the removal of adsorbed CO on the surface of the Pt, thereby promoting the EOR. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/16511-6 - Nanoestruturas para a geração de energia a partir de biocombustível
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/09145-6 - Estudo do mecanismo de oxidação eletroquímica de etanol com eletrocatalisadores de PtSn, PtCe e PtSnCe utilizando técnicas espectroscópicas in-situ
• Beneficiário: Rodrigo Fernando Brambilla de Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/03037-4 - Estudo do mecanismo de degradação dos catalisadores anódicos e catódicos de uma célula a combustível de álcool direto
• Beneficiário: Fernando Carmona Simões
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado