Journal
JOURNAL OF POWER SOURCES
Volume 208, Issue -, Pages 288-295Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.02.065
Keywords
PtCu synthesis; Cathode catalysts; Fuel cells; Evaluation standard; Degradation mechanism; Electrochemical characterization
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Electrochemically dealloyed PtCu alloy nanoparticles successfully meet the automotive technology target of having four times higher Pt mass activity for the electroreduction of molecular oxygen compared to current state-of-the-art platinum catalysts [1]. However, the catalysts must also maintain their activity throughout the aggressive automotive drive-cycles in order to be implemented in fuel cells cars. Here, the durability of dealloyed PtCu catalysts was systematically evaluated under various voltage-cycles using a rotating ring disk electrode. The stability of the non-noble metal alloy component was proven at electrode potentials below 0.6V. The platinum stability was evaluated at potentials up to 1.1 V to avoid carbon corrosion and then up to 1.2 V to be closer to the more aggressive cycles developed in startup/shutdown events of the fuel cells. The major known failure modes such as non-noble metal dissolution, platinum dissolution, and particle growth/agglomeration were monitored in order to understand closely the PtCu nanoparticles behavior under different potential cycles and to provide a degradation fingerprint. (C) 2012 Elsevier B.V. All rights reserved.
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