Electrochemical reduction of oxygen on carbon supported Pt and Pt/Ru fuel cell electrodes in alkaline solutions
Electrochemical reduction of oxygen on carbon supported Pt and Pt/Ru fuel cell electrodes in alkaline solutions
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.
Alkaline Media, Cyclic Voltammetry, Electrochemical Impedance Spectroscopy (EIS), Methanol, O Reduction
169-176
Yu, E. H.
28e47863-4b50-4821-b80b-71fb5a2edef2
Scott, K.
d3e0ec37-b693-49b8-b313-8c13f259e9dd
Reeve, R. W.
ffb7945e-6dc8-42d2-8743-efec2d154598
6 February 2004
Yu, E. H.
28e47863-4b50-4821-b80b-71fb5a2edef2
Scott, K.
d3e0ec37-b693-49b8-b313-8c13f259e9dd
Reeve, R. W.
ffb7945e-6dc8-42d2-8743-efec2d154598
Yu, E. H., Scott, K. and Reeve, R. W.
(2004)
Electrochemical reduction of oxygen on carbon supported Pt and Pt/Ru fuel cell electrodes in alkaline solutions.
Fuel Cells, 3 (4), .
(doi:10.1002/fuce.200330129).
Abstract
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.
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Published date: 6 February 2004
Keywords:
Alkaline Media, Cyclic Voltammetry, Electrochemical Impedance Spectroscopy (EIS), Methanol, O Reduction
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Local EPrints ID: 499394
URI: http://eprints.soton.ac.uk/id/eprint/499394
ISSN: 1615-6846
PURE UUID: 5eb5a06b-88ff-4338-9000-3c7c7af92a35
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Date deposited: 18 Mar 2025 17:56
Last modified: 20 Mar 2025 03:14
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Author:
E. H. Yu
Author:
K. Scott
Author:
R. W. Reeve
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