Journal
JOURNAL OF POWER SOURCES
Volume 231, Issue -, Pages 122-133Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.12.091
Keywords
Ethanol electrooxidation; Alkaline solution; Elevated temperatures; Apparent activation energy; Pt-based catalysts; Pd-based catalysts
Funding
- Federal Ministry of Research and Technology [03SF0311C]
- Baden-Wurttemberg Foundation [MBZ 20]
Ask authors/readers for more resources
Aiming at a detailed kinetic understanding under fuel cell relevant, but nevertheless well-defined reaction and transport conditions, the electrooxidation of ethanol on Pt-based (Pt/C, PtRu black) and Pd-based (Pd/C, Pd/CeO2/C) catalysts in alkaline solution was investigated at temperatures up to 100 degrees C and at controlled electrolyte flow in a high temperature/high pressure thin-layer flow cell. Most important, the data reveal drastic effects of the reaction temperature. The apparent activation energies for ethanol oxidation on the different catalysts were determined and found to vary significantly with potential and the catalyst used. The addition of Ru to Pt and CeO2 to Pd/C improves the tolerance toward catalyst poisoning at low potentials, while for higher potentials and especially at higher temperatures the activity of the monometallic catalysts is higher. For reaction at 0.5 V and 80 degrees C, the Pd/C catalyst exhibits the highest activity, both in terms of metal mass specific and active surface area normalized rates; the addition of an oxophilic component is beneficial only for lower potentials. Overall, the results illustrate the need for model studies under close to realistic reaction conditions for the understanding of reactions in fuel cells. (C) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available