Enhancement of ethanol oxidation on Pd nanoparticles supported on carbon-antimony tin oxide hybrids unveils the relevance of electronic effects

Author(s)

Alvarenga, Gabriel M. ; Coutinho Gallo, Ira B. ; Villullas, Hebe M.

• Document type: Journal article
• Source: JOURNAL OF CATALYSIS; v. 348, p. 1-8, APR 2017.
• Web of Science Citations: 20

Abstract

A comparative study of activity toward ethanol oxidation was carried out for catalysts having the same loading of identical Pd nanoparticles supported on carbon-oxide hybrids containing antimony tin oxide (Sb2O5/SnO2 - ATO) in different amounts (20, 30 and 40 wt.%). Enhanced catalytic activity was observed for Pd nanoparticles supported on C-ATO hybrids. X-ray absorption spectroscopy experiments carried out around the Pd L-3 edge evidenced an increase in the electronic occupancy of the Pd 4d band indicating an electronic transfer from the hybrid supports to the Pd particles. A strong correlation between ethanol oxidation currents and X-ray absorption data reveals the importance of electronic effects in the electrocatalysis of ethanol oxidation on Pd. In addition, FTIR data show that C-ATO hybrid supports promote a decrease in the onset potential and an increase in carbonate/CO2 production. (C) 2017 Elsevier Inc. All rights reserved. (AU)

• FAPESP's process: 13/50206-4 - The development of multifunctional catalysts to replace Pt for fuel oxidation reactions in low temperature fuel cells toward environmentally friendly energy production
• Grantee: Hebe de las Mercedes Villullas
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 14/02387-2 - Preparation and studies of performance of multifunctional catalysts for ethanol oxidation in alkaline medium
• Grantee: Gabriel Martins de Alvarenga
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 14/12255-6 - Catalysis-nanostructure-properties relations: establishing basis for the design of multifunctional catalysts
• Grantee: Hebe de las Mercedes Villullas
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/05041-5 - Studies of the influence of metal-support interaction on the mechanism of the ethanol oxidation reaction on Pd nanoparticles
• Grantee: Gabriel Martins de Alvarenga
• Support Opportunities: Scholarships in Brazil - Master