Single-Wall Nanohorns as Electrocatalyst Support for High Temperature PEM Fuel Cells

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Boaventura, M. (Autor) FEUP; Lúcia Brandão (Autor) FEUP; Adélio Mendes (Autor) FEUP

Revista

Título: Journal of the Electrochemical Society

Vol. 158

Páginas: B394-B401

ISSN: 0013-4651

Editora: Electrochemical Society, Inc.

Indexação

ISI Web of Knowledge - 13 Citações

Scopus - 13 Citações

Outras Informações

ID Authenticus: P-002-XNS

DOI: 10.1149/1.3551495

Abstract (EN): This work compares the performance of electrodes prepared with electrocatalysts based on platinum supported in single-wall carbon nanohorns (Pt-SWNHs) and in carbon black (Pt-carbon black) for high temperature fuel cells. Membrane electrode assemblies (MEAs) assembled with phosphoric acid doped polybenzimidazole (PBI/H3PO4) membrane were characterized by polarization curves, ac impedance spectroscopy and cyclic voltammetry (CV), at 160 degrees C. A similar power density peak was obtained for both MEAs, at 160 degrees C and 1.0% relative humidity. The electrochemical characterization showed a higher ohmic resistance for the Pt-SWNH compared to carbon black-based MEA, due to the higher hydrophobic character of the SWNH carbon support. Furthermore, the Pt-SWNH anode presented a lower charge transfer resistance than the correspondent carbon black but similar cathode charge transfer resistance. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3551495]

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8