Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 13, Pages 6490-6500Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.04.016
Keywords
Fuel cell; Alkaline direct ethanol fuel cell; Electrocatalyst; Stabilization; Palladium-gold alloy
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Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [623008]
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Motivated by the idea that a monometal catalyst can become more stabilized with the incorporation of gold due to its unique electron-withdrawing effect to neighboring primary metal atoms, in this work we prepare Pd-Au alloy electrocatalysts for the ethanol oxidation reaction in an alkaline medium with the dimethylformamide co-reduction method under an ultrasonic process. The atomic ratio of Pd to Au is varied from 7:1 to 3:1 and 1:1 on the basis of a crystal cell of the face-centered cubic. Electrochemical characterizations indicate that in terms of the peak current density, the prepared catalyst samples are in sequence of Pd/C > Pd3Au/C > Pd7Au/C > PdAu/C, but the stability tests demonstrate that the catalyst samples are sequenced in PdAu/C > Pd3Au/C > Pd7Au/C > Pd/C. On the compromise between the activity and stability, it turns out that the Pd3Au/C can exhibit an enhanced catalytic stability while maintain the comparable catalytic activity for the ethanol oxidation reaction as compared with the monometallic Pd/C catalyst. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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