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Kinetic-study of electrochemical reactions at catalyst-recast ionomer interfaces from thin active layer modeling

Authors
  • Gloaguen, Frédéric
  • Andolfatto, F.
  • Durand, R.
  • Ozil, P.
Publication Date
Jan 01, 1994
Source
Kaleidoscope Open Archive
Keywords
Language
English
License
Unknown
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Abstract

The objective of the following study was to test proton exchange membrane fuel cell catalysts. A mixture of supported catalyst and recast ionomer (Nafion®) was deposited on a rotating disc electrode (RDE). The resulting thin active layer was immersed in a dilute sulphuric acid solution. The RDE technique allows correction of mass transfer limitation in solution. To calculate the kinetic parameters from the current-potential relation, a mathematical model was written taking into account gas diffusion, ohmic drops and interfacial kinetics within the thin layer. Analytic and/or numerical expressions for the effectiveness factor and for the current-potential relation were obtained. The oxygen reduction reaction at various Pt/C-recast Nafion® interfaces demonstrates the validity of this test procedure.

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