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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.)

PtSnNi/C nanoparticle electrocatalysts for the ethanol oxidation reaction: Ni stability study

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Author(s):
Parreira, Luanna Silveira [1] ; Martins da Silva, Julio Cesar [1] ; D'Villa -Silva, Melina [1] ; Simoes, Fernando Carmona [1] ; Garcia, Samara [1] ; Gaubeur, Ivanise [1] ; Liutheviciene Cordeiro, Marco Aurelio [2] ; Leite, Edson Roberto [2] ; dos Santos, Mauro Coelho [1]
Total Authors: 9
Affiliation:
[1] Univ Fed ABC, CCNH Ctr Ciencias Nat & Humanas, Lab Eletroquim & Mat Nanoestruturados, BR-09210170 Santo Andre, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Electrochimica Acta; v. 96, p. 243-252, APR 30 2013.
Web of Science Citations: 26
Abstract

This work describes the use of Pt3Sn/C, Pt3Ni/C and Pt3SnNi/C nanoparticle electrocatalysts with a 20% metal loading on carbon prepared using the polymeric precursor method for the ethanol oxidation reaction (EOR). XRD measurements revealed the presence of segregated Pt and NiO phases in the Pt3Ni/C electrocatalysts, whereas for Pt3SnNi/C, there was some evidence that Ni and Sn atoms are incorporated into the Pt structure with the presence of segregated SnO2 and NiO phases. The mean crystallite sizes were 3.6, 5.7 and 7.2 nm for Pt3Sn/C, Pt3Ni/C, and Pt3SnNi/C, respectively. The onset oxidation potential obtained for the EOR using Pt3SnNi/C was close to 0.22V. Chronoamperometric measurements revealed that the highest current densities for the EOR were obtained using the Pt3SnNi/C nanoparticle electrocatalysts (16 mA mg(Pt)(-1)). Based on the Ni accelerated stress tests, this element was more stable in the ternary material. In contrast, there was a change in the product formation pathways before (acetaldehyde and acetic acid were the primary products) and after the accelerated stress tests (acetaldehyde was the primary product) for the Pt3SnNi/C catalyst. The experimental results indicate that the Pt3SnNi/C electrocatalysts exhibited better electrocatalytic activity compared to the other electrocatalysts for the EOR. It is suggested that this activity is related to the presence of Ni, which can modify the electronic structure of Pt and combine with Sn to facilitate the removal of adsorbed CO on the surface of the Pt, thereby promoting the EOR. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/16511-6 - Energy generation from biofuel using nanostructures
Grantee:Mauro Coelho dos Santos
Support Opportunities: Regular Research Grants
FAPESP's process: 09/09145-6 - Study of ethanol electrochemical oxidation mechanism on PtSn, PtCe and PtSnCe using in-situ spectroscopic techniques
Grantee:Rodrigo Fernando Brambilla de Souza
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 10/03037-4 - Degradation mechanism study of the cathode and anode catalyst for direct ethanol fuel cell
Grantee:Fernando Carmona Simões
Support Opportunities: Scholarships in Brazil - Post-Doctoral