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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A comparative investigation of metal-support interactions on the catalytic activity of Pt nanoparticles for ethanol oxidation in alkaline medium

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Godoi, Denis R. M. [1] ; Villullas, Hebe M. [1] ; Zhu, Fu-Chun [2] ; Jiang, Yan-Xia [2] ; Sun, Shi-Gang [2] ; Guo, Junsong [3] ; Sun, Lili [3] ; Chen, Rongrong [3]
Total Authors: 8
[1] Univ Estadual Paulista UNESP, Inst Quim, BR-14800 Araraquara, SP - Brazil
[2] Xiamen Univ, Sch Energy Res, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Dept Chem, Xiamen 361005 - Peoples R China
[3] Indiana Univ Purdue Univ, Richard G Lugar Ctr Renewable Energy, Indianapolis, IN 46202 - USA
Total Affiliations: 3
Document type: Journal article
Source: Journal of Power Sources; v. 311, p. 81-90, APR 15 2016.
Web of Science Citations: 23

The effects of interactions of Pt nanoparticles with hybrid supports on reactivity towards ethanol oxidation in alkaline solution are investigated. Studies involve catalysts with identical Pt nanoparticles on six hybrid supports containing carbon powder and transition metal oxides (TiO2, ZrO2, SnO2, CeO2, MoO3 and WO3). In situ X-ray absorption spectroscopy (XAS) results evidence that metal-support interactions produce changes in the Pt 5d band vacancy, which appears to determine the catalytic activity. The highest and lowest activities are observed for Pt nanoparticles on hybrid supports containing TiO2 and CeO2, respectively. Further studies are presented for these two catalysts. In situ FTIR reflection spectroscopy measurements, taken using both multi-stepped FTIR spectroscopy (MS-FTIR) and single potential alteration FTIR spectroscopy (SPA-FTIR), evidence that the main product of ethanol oxidation is acetate, although signals attributed to carbonate and CO2 indicate some differences in CO2 production. Fuel cell performances of these catalysts, tested in a 4.5 cm(2) single cell at different temperatures (40-90 degrees C) show good agreement with data obtained by electrochemical techniques. Results of this comprehensive study point out the possibility of compensating a reduction of noble metal load with an increase in activity promoted by interactions between metallic nanoparticles and a support. (C) 2016 Elsevier B.V. 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: 14/12255-6 - 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: 13/01822-4 - Mechanistic study of methanol and ethanol oxidation reactions on platinum supported on carbon-transition metal oxide nanocomposites
Grantee:Denis Ricardo Martins de Godoi
Support Opportunities: Scholarships in Brazil - Post-Doctorate