Electrocatalytic Corrosion of Carbon Support in PEMFC Cathodes

  • Roen L
  • Paik C
  • Jarvi T
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The influence of platinum on the corrosion of carbon catalyst supports has been characterized by on-line mass spectroscopy during cyclic voltammetry, with varying Pt mass fraction, catalyst type, and temperature. The CO2 generation rates increased with higher Pt mass fraction (0, 10, and 39{%} balanced by Vulcan XC-72). A peak observed at approximately +0.55 VRHE for Pt/C was lowered to +0.45 V-RHE for PtRu/C. An Arrenhius plot indicated higher apparent activation energy for CO2 production at the positive potential limit of the cyclic voltammogram on 0{%} Pt (carbon-only) electrode than on 39{%} Pt/C electrode. It was concluded that platinum accelerated the corrosion rate of the carbon catalyst support. (C) 2003 The Electrochemical Society.

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  • L. M. Roen

  • C. H. Paik

  • T. D. Jarvi

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