O2 reduction at the Pt/Nafion interface in 85% concentrated H3PO4 |
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| Authors: | Deryn Chu |
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| Affiliation: | U.S. Army Research Laboratory, Electrochemistry Branch, Sensors and Electron Devices Directorate, Adelphi, MD 20783-1197, USA |
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| Abstract: | The kinetics of oxygen electroreduction have been studied on a smooth platinum electrode coated with Nafion® in concentrated 85% H3PO4. The effects of Nafion® coatings of different thickness on O2 electroreduction at a smooth Pt rotating disk electrode with 85% phosphoric acid as the bulk electrolyte were examined. The kinetic current increases with increasing Nafion® film thickness while the diffusion limiting current decreases with increasing Nafion® film thickness. A O2 concentration profile model for the Pt/Nafion®/bulk electrolyte has been established, and this model can be used to explain the O2 reduction polarization results. The performance of Nafion®-modified, high surface area Pt/carbon air cathodes for use in the H2–air concentrated phosphoric acid fuel cell was also studied. |
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| Keywords: | Nafion (a trademark of E I du Pont de Nemours and Company) platinum O2 reduction 85% H3PO4 fuel cell |
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