PtAg/MnOx/C as a promising electrocatalyst for glycerol electro-oxidation in alkaline medium

Autor(es)

Garcia, Amanda C. ; Ferreira, Eduardo B. ; Silva de Barros, Vanine V. ; Linares, Jose J. ; Tremiliosi-Filho, Germano

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 793, p. 9-pg., 2017-05-15.

Resumo

This study shows the positive effect that Ag possesses on Pt in order to promote the glycerol electro-oxidation in alkaline medium and how this effect can be boosted with an appropriate catalyst support, such as MnOx/C. The addition of Ag to the catalyst formulation firstly impacts on the structural and electronic features of the bimetallic PtAg/C catalyst. The diffractograms evidence the formation of a PtAg nanometric alloy, which alters the electronic environment of Pt as evidenced by the reduction of the Pt L-III white line hump in the XANES spectrum. This effect is intensified at high potential in the PtAg/MnOx/C catalyst, indicative of the low affinity of Pt to form surface PtOx species, leading to a Pt surface in which the intermediates formed are less strongly adsorbed. Moreover, MnOx can act as a source of oxygenated species required by the glycerol electro-oxidation reaction (GEOR), leading to an optimum catalytic surface. Such combination of factors leads to a very electroactive material for glycerol electro-oxidation as demonstrated by the cyclic voltammetry, chronoamperometric curves and in the actual fuel cell, in addition to a different product distribution characterised by in-situ electrochemical Fourier transform infrared spectroscopy (EC-FTIR). (C) 2016 Published by Elsevier B.V. (AU)

• Processo FAPESP: 12/10856-7 - Investigação do mecanismo de eletro-oxidação do glicerol em nanopartículas metálicas
• Beneficiário: Amanda Cristina Garcia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/05627-9 - Síntese de nanopartículas de ouro usando glicerol como redutor em meio alcalino: estudo das variáveis de síntese e aplicação na oxidação de etanol
• Beneficiário: Eduardo de Barros Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático