Abstract
The current-potential behavior of the polymer electrolyte fuel cell cathode has been subjected to a new type of curve-fitting analysis that is not based on a specific model but rather utilizes a series of Tafel slope components: a primary slope, with an effective transfer coefficient αc,eff of close to unity, plus a doubled component (αc,eff ca. 1/2), a quadrupled component (αc,eff ca. 1/4) and a limiting current, the latter being necessary for air feed. With this approach, we are able to fit single-cell data within experimental error. The parameters can be used conveniently to compare the performance of different cathodes.
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