Oxygen Reduction Reaction at Three‐Phase Interfaces
- 6 September 2010
- journal article
- research article
- Published by Wiley in Chemphyschem
- Vol. 11 (13), 2825-2833
- https://doi.org/10.1002/cphc.201000190
Abstract
The kinetics of the oxygen reduction reaction (ORR) is studied at metal–supporting electrolyte–Nafion three-phase interfaces. We first demonstrate that the sulfonate anions of Nafion are specifically adsorbed on a wide range of surfaces ranging from Pt(hkl) single-crystal surfaces, Pt-poly, Pt-skin [produced on a Pt3Ni(111) surface by annealing in ultrahigh vacuum, UHV] to high-surface-area nanostructured thin-film (NSTF) catalysts. The surface coverage by sulfonate and the strength of the Pt–sulfonate interaction are strongly dependent on the geometry and the nature of the Pt surface atoms. Also, they are found to behave analogous to (bi)sulfate anion-specific adsorption on these surfaces, where for the Pt(hkl) surfaces, the trend is Pt(111)>Pt(110)>Pt(100) and for the Pt-skin surface on Pt3Ni(111), the interaction strength is found to be Pt-skinKeywords
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