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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.)

Electrochemical and Fuel Cell Evaluation of PtIr/C Electrocatalysts for Ethanol Electrooxidation in Alkaline Medium

Full text
Author(s):
da Silva, Sirlane G. [1] ; Assumpcao, Monica H. M. T. [1] ; de Souza, Rodrigo F. B. [1] ; Buzzo, Guilherme S. [1] ; Spinace, Estevam V. [1] ; Neto, Almir O. [1] ; Silva, Julio Cesar M. [1]
Total Authors: 7
Affiliation:
[1] CNEN SP, IPEN, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ELECTROCATALYSIS; v. 5, n. 4, p. 438-444, OCT 2014.
Web of Science Citations: 8
Abstract

PtIr/C electrocatalysts prepared by borohydride reduction process were characterized by X-ray diffraction, transmission electron microscopy, and cyclic voltammetry. The X-ray diffraction measurements suggested the PtIr alloy formation; furthermore, peaks of IrO2 were not observed; nevertheless, the presence of Ir oxides in small amounts and amorphous forms cannot be discarded. The transmission electron microscopy showed the average particle diameter between 4.0 and 6.0 nm for all compositions prepared. The catalytic activity for ethanol electrooxidation in alkaline medium at room temperature (cyclic voltammetry and chronoamperometry results) showed that PtIr/C (70:30) and PtIr (90:10) exhibited higher performance toward ethanol oxidation than the other electrocatalysts. Experiments using direct ethanol alkaline fuel cell at 75 A degrees C showed PtIr (90:10) as the best electrocatalyst and Ir/C as virtually inactive for ethanol oxidation in real conditions. The best result obtained using PtIr/C may be associated to the electronic effect between Pt and Ir that could decrease the poisoning on catalyst surface and also by the occurrence of bifunctional mechanism. (AU)

FAPESP's process: 12/22731-4 - Electrocatalysts SUPPORTED IN DIFFERENT SUBSTRATES prepared by codeposition electrochemistry for direct liquid fuel cell (methanol , ethanol and formic acidic)
Grantee:Guilherme Soares Buzzo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 11/18246-0 - Preparation of PD binary and ternary electrocatalysts by borohydride reduction for alcohol electro-oxidation in alkaline medium
Grantee:Almir Oliveira Neto
Support Opportunities: Regular Research Grants
FAPESP's process: 13/01577-0 - Development of materials and degradation studies of electrocatalysts and supports for alkaline fuel cell
Grantee:Júlio César Martins da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/03516-5 - Oxides-C supported electrocatalysts for direct liquid fuel cell anodes
Grantee:Rodrigo Fernando Brambilla de Souza
Support Opportunities: Scholarships in Brazil - Post-Doctoral