Abstract
Fundamental understandings on the impacts induced by anions and cations on oxygen reduction reaction (ORR) are of great interest in designing more efficient catalysts and identifying reasons for discrepancies in activities measured in different protocols. In this paper, the specific adsorption of various anions and cations on platinum and palladium catalysts and their effects on the ORR kinetics were summarized. It was found that ClO4 - had a negligible impact on the ORR activity of Pt/C possibly due to its weak adsorption. Nafion ionomers can significantly poison the bulk Pt surfaces, but its impact on Pt/C is negligible. Self-dissociation of citrate anion was found to occur on both Pt/C and Pd/C.
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