Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Borohydride electrooxidation on Au and Pt electrodes

Texto completo
Autor(es):
Lima, Fabio H. B. [1] ; Pasqualeti, Anielli M. [1] ; Concha, M. Belen Molina [2] ; Chatenet, Marian [2] ; Ticianelli, Edson A. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] UJF, UdS, Grenoble IN, LEPMI, CNRS, UMR 5279, F-38402 St Martin Dheres - France
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Electrochimica Acta; v. 84, n. SI, p. 202-212, DEC 1 2012.
Citações Web of Science: 61
Resumo

Direct borohydride fuel cells (DBFCs) are attractive energy generators for powering portable electronic devices, mainly due to their high energy density and number of electrons per borohydride ion. However, the lack of a highly efficient electrocatalyst for the borohydride oxidation reaction limits the performance of these devices. The most commonly studied electrocatalysts for this reaction are composed of gold and platinum. Nevertheless, for these metals, the borohydride electrooxidation reaction mechanism (BOR) is not completely understood, and the total oxidation reaction, involving eight electrons per BH4- species, competes with parallel reactions, with a lower number of exchanged electrons and/or with heterogeneous chemical hydrolysis. Considering the above-mentioned issues, this work presents recent advances in the knowledge of the BOR pathways on polycrystalline (bulk) Au and Pt electrocatalysts. It presents the studies of the BOR reaction on Au and Pt electrodes using in situ Fourier Transform Infrared Spectroscopy (FUR), and on-line Differential Electrochemical Mass Spectrometry (DEMS). The spectroscopic and spectrometric data provided physical evidence of intermediate species and the formation of H-2 in the course of the BOR as a function of the electrode potential. These results enabled to advance in the knowledge about the BOR pathways on Au and Pt electrocatalysts. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 11/03672-4 - Investigação da atividade de eletrocatalisadores nanoestruturados para a eletrooxidação de íons BH4- em eletrólito alcalino
Beneficiário:Aniélli Martini Pasqualeti
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 09/07629-6 - Eletrocatálise IV: aspectos fundamentais e aplicados dos processos eletrocatalíticos, bio-eletrocatálise e instabilidades cinéticas
Beneficiário:Edson Antonio Ticianelli
Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Temático