Abstract
Abstract A study of O 2 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 O 2 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 O 2 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 O 2 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.
Keywords
MethanolTafel equationElectrochemistryChemistryCatalysisInorganic chemistryGas diffusion electrodeElectrodeDielectric spectroscopyElectrocatalystDirect methanol fuel cellCarbon fibersCathodeMaterials sciencePhysical chemistryOrganic chemistry
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Publication Info
- Year
- 2003
- Type
- article
- Volume
- 3
- Issue
- 4
- Pages
- 169-176
- Citations
- 39
- Access
- Closed
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Cite This
Eileen Hao Yu,
Keith Scott,
R.W. Reeve
(2003).
Electrochemical Reduction of Oxygen on Carbon Supported Pt and Pt/Ru Fuel Cell Electrodes in Alkaline Solutions.
Fuel Cells
, 3
(4)
, 169-176.
https://doi.org/10.1002/fuce.200330129
Identifiers
- DOI
- 10.1002/fuce.200330129