Reduction of Methanol Crossover by a Pt Film Directly Sputtered on Nafion Membrane

We quantitatively evaluated the effect of a thin Pt film sputtered on the polymer electrolyte on the methanol crossover. The Pt film brought about around 15 and 30% reduction in the methanol crossover for 6-nm and 30-nm thick films respectively, depending on its thickness. With the aid of FE-SEM, a...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2005/01/05, Vol.73(1), pp.67-70
Main Authors: XLU, Yi Kun, KAMATA, Kosuke, ONO, Tomohisa, KOBAYASHI, Kazumasa, NAKAZATO, Tsutomu, NAKAGAWA, Nobuyoshi
Format: Article
Language:English
Subjects:
Direct Methanol Fuel Cell (DMFC)
Methanol Crossover
Pt Sputtering
Surface Modification
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Summary:We quantitatively evaluated the effect of a thin Pt film sputtered on the polymer electrolyte on the methanol crossover. The Pt film brought about around 15 and 30% reduction in the methanol crossover for 6-nm and 30-nm thick films respectively, depending on its thickness. With the aid of FE-SEM, a relatively dense structure with many slender cracks of the Pt-sputtered film has been identified and ATR-FTIR analysis for Pt-sputtered membrane revealed a little change in chemical structure of polymer membrane after sputtering Pt onto the Nafion® membrane. Although the Pt film as a barrier for the mass transport caused an increase in the ohmic resistance of the electrode, it also prevented the methanol crossover in a DMFC.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.73.67