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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.)

Pt-Sn-Eu/C Catalysts: Application of Rare Earth Metals as Anodes in Direct Ethanol Fuel Cells

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Corradini, P. G. [1] ; Santos, N. A. [1] ; Perez, J. [1]
Total Authors: 3
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: FUEL CELLS; v. 18, n. 1, p. 73-81, FEB 18 2018.
Web of Science Citations: 9

Pt-Sn-Eu catalysts were synthesized by modified polyol method, evaluated for the ethanol oxidation reaction (EOR), and compared to commercial Pt/C and Pt-Sn/C catalysts. The catalysts were electrochemically characterized in both three-electrode and fuel cell setups. X-ray diffraction measurements indicated some degree of Pt-Sn alloying in the Pt-Sn-Eu/C catalysts, and mean crystallite sizes between 2.3-3.3 nm, while X-ray photoelectron spectroscopy measurements showed the presence of Pt and Sn in both metallic and oxide form, and rare earth metals in the form of mixed oxides. Adding tin and europium promoted filling of the Pt 5d band, as confirmed by X-ray absorption. The electrochemical characterization showed a higher oxidation current density and lower oxidation onset potential for the ternary Pt-Sn-Eu materials compared with the commercial catalysts, in both the three-cell and fuel cell tests. High performance liquid chromatography measurements indicating that the main products of ethanol oxidation were acetaldehyde and acetic acid; a low concentration of CO2 was also detected. The improved ethanol oxidation efficiency for the Pt-Sn-Eu/C catalysts can be explained by the Sn/Eu-Pt electronic effect, because it weakens the adsorption of intermediate products by Pt, and favors the bifunctional EOR mechanism, as europium oxide renders oxygenated species available at lower potentials. (AU)

FAPESP's process: 12/12189-8 - Investigation of platinum-rare earth nanocatalysts supported in carbon for direct ethanol fuel cells
Grantee:Patricia Gon Corradini
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/13218-0 - New routes for Pt-Sn-Eu/C catalysts for ethanol oxidation reaction
Grantee:Patricia Gon Corradini
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/17549-5 - Study of variations of physico-chemical properties of Nd-Pt/C and Pt-Nd-Sn/C for the ethanol electro-oxidation.
Grantee:Nathalia Abe Santos
Support type: Scholarships in Brazil - Doctorate