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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.)

Activity, mechanism, and short-term stability evaluation of PtSn-rare earth/C electrocatalysts for the ethanol oxidation reaction

Full text
Author(s):
Corradini, Patricia Gon [1] ; Perez, Joelma [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem IQSC, CP 780, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Solid State Electrochemistry; v. 22, n. 5, SI, p. 1525-1537, MAY 2018.
Web of Science Citations: 3
Abstract

Rare earths (RE) have been studied in the literature as additives in Pt and PtSn catalysts for the ethanol oxidation reaction (EOR), but their stability and influence on the mechanism of the EOR have not been reported. In this work, PtSnRE/C (RE: La, Ce, and Pr) catalysts were obtained by the polyol method, characterized, and their stability toward the EOR evaluated by cycling at two different potential ranges. The accelerated aging tests indicated that despite the changes in the CO stripping profiles, the ternary catalysts exhibit higher current densities after aging than Pt/C and PtSn/C catalysts. Even after dissolution of the rare-earth metals, as observed by energy-dispersive X-ray spectroscopy (EDS) before and after aging, the EOR activity after short-term stability tests was found to be higher than the initial one. The addition of these metals facilitates the retention of tin in the material, contributing to the overall stability of the bimetallic catalyst. The oxidation products of the ternary catalysts were evaluated by in situ Fourier transform infrared spectroscopy (FTIR) spectroscopy and high-performance liquid chromatography (HPLC), where the major products were found to be acetaldehyde and acetic acid, with only small concentrations of CO2. The improvement in the ethanol oxidation efficiency by PtSnRE/C catalysts can be explained by a bifunctional mechanism in which the rare-earth oxides are able to provide oxygenated species at low 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