Potential oscillations in a proton exchange membrane fuel cell with a Pd-Pt/C anode

Autor(es)

Lopes, Pietro P. ; Ticianelli, Edson A. ; Varela, Hamilton

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 196, n. 1, p. 6-pg., 2011-01-01.

Resumo

We report in this paper the occurrence of potential oscillations in a proton exchange membrane fuel cell (PEMFC) with a Pd-Pt/C anode, fed with H-2/100 ppm CO, and operated at 30 degrees C. We demonstrate that the use of Pd-Pt/C anode enables the emergence of dynamic instabilities in a PEMFC. Oscillations are characterized by the presence of very high oscillation amplitude, ca. 0.8 V. which is almost twice that observed in a PEMFC with a Pt-Ru/C anode under similar conditions. The effects of the H-2/CO flow rate and cell current density on the oscillatory dynamics were investigated and the mechanism rationalized in terms of the CO oxidation and adsorption processes. We also discuss the fundamental aspects concerning the operation of a PEMFC under oscillatory regime in terms of the benefit resulting from the higher average power output. (c) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/07629-6 - Eletrocatálise IV: aspectos fundamentais e aplicados dos processos eletrocatalíticos, bio-eletrocatálise e instabilidades cinéticas
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 08/10529-0 - Preparação e caracterização de eletrocatalisadores nanoparticulados de PtMo/C e PtW/C para a oxidação de hidrogênio na presença de CO em células a combustível tipo PEM
• Beneficiário: Pietro Papa Lopes
• Modalidade de apoio: Bolsas no Brasil - Doutorado