Journal article
Oxygen Reduction on Gas-Diffusion Electrodes for Phosphoric Acid Fuel Cells by a Potential Decay Method
The reduction of gaseous oxygen on carbon supported platinum electrodes has been studied at 150 degrees C with polarization and potential decay measurements. The electrolyte was either 100 weight percent phosphoric acid or that acid with a fluorinated additive, potassium perfluorohexanesulfonate (C6F13SO3K).
The pseudo-Tafel curves of the overpotential vs. log (ii(L)/(i(L) - i)) show a two-slope behavior, probably due to different adsorption mechanisms. The potential relaxations as functions of log (t + tau) and log (-d eta/dt) have been plotted. The variations of these slopes and the dependence of the double-layer capacitance on the overpotential depended on the electrode manufacture and the kind of electrolyte (whether containing the fluorinated additive or not).
Language: | English |
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Publisher: | The Electrochemical Society |
Year: | 1995 |
Pages: | 3250-3256 |
ISSN: | 19457111 and 00134651 |
Types: | Journal article |
DOI: | 10.1149/1.2049970 |
ORCIDs: | Li, Qingfeng , Berg, Rolf W. and Bjerrum, Niels |