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Lookup NU author(s): Professor Eileen Yu,
Emeritus Professor Keith Scott,
Dr Robert Reeve
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A study of O2 reduction in 1 M NaOH solution at gas diffusion electrodes made from carbon supported Pt and Pt/Ru catalysts is reported. Two Tafel regions were observed for both the Pt and Pt/Ru electrodes. Although the same mechanism was suggested for oxygen reduction on both Pt and Pt/Ru catalysts, the O2 reduction activity was lower on Ru. Electrochemical Impedance Spectroscopy (EIS) analysis was carried out at different potentials and showed the significant contribution of diffusion on the reaction process and kinetics. The effect of methanol on O2 reduction was investigated in solutions containing various concentrations of methanol. The electrode performance deteriorated with increasing methanol concentration because of a mixed cathode potential. The methanol tolerance, i. e., the methanol concentration which polarises the O2 reduction reaction for O 2 reduction, at the Pt/C electrode with a Pt loading of 1.2 mg cm-2 is 0.2 M methanol in 1 M NaOH.
Author(s): Yu EH, Scott K, Reeve RW
Publication type: Article
Publication status: Published
Journal: Fuel Cells
ISSN (print): 1615-6846
ISSN (electronic): 1615-6854
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
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