Effect of Acetic Acid on Carbon Monoxide Electrooxidation over Tin Oxide and Rhodium-Modified Platinum Electrode Materials

The ethanol-to-CO 2 conversion in a direct ethanol fuel cell application, which should theoretically exchange 12 electrons/molecule, leads mainly to acetic acid and, in a small amount, to carbon monoxide (CO) at the surface of Sn and Rh oxide-modified anode materials. According to the amount of thes...

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Bibliographic Details
Published in:Electrocatalysis 2017, Vol.8 (1), p.11-15
Main Authors: Soares, Layciane A., Purgato, Fabiana L. S., Morais, Claudia, Napporn, Teko W., Kokoh, K. B., Olivi, Paulo
Format: Article
Language:English
Subjects:
Acetic acid
Anodes
Carbon monoxide
Catalysis
Chemical Sciences
Chemistry
Chemistry and Materials Science
Electrochemistry
Electrode materials
Electrodes
Energy Systems
Ethanol
Fuel cells
Original Research
Oxidation
Physical Chemistry
Reaction mechanisms
Rhodium
Tin dioxide
Tin oxides
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Summary:The ethanol-to-CO 2 conversion in a direct ethanol fuel cell application, which should theoretically exchange 12 electrons/molecule, leads mainly to acetic acid and, in a small amount, to carbon monoxide (CO) at the surface of Sn and Rh oxide-modified anode materials. According to the amount of these intermediate products, the reaction mechanism was found to be thoroughly modified. Therefore, investigations with cyclic voltammetric CO stripping combined with in situ infrared spectroscopy have aided to assess how the amount of produced acetic acid influenced CO electrooxidation using Pt/C, Pt 80 Rh 20 /C, Pt–SnO 2 /C, or Pt 80 Rh 20 –SnO 2 /C as electrode material. Based on the results, the adsorption of CO was hindered when the acetic acid concentration increased and the potential of the CO oxidation process shifted toward higher values. Graphical Abstract ᅟ
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-016-0333-y