Affiliation:
1. Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106-7078
Abstract
A quantum mechanical study of O2 and OOH adsorption on Pt(111) and on a Pt monolayer on Pt3Cr(111) is presented. The calculated adsorption energies are used to predict the reversible potential for O2 reduction to OOH(ads) on these surfaces. The resulting 0.43V for Pt(111) and 0.49V for the Pt skin on the Pt3Cr(111) are far from the 1.23V reversible potential for the four-electron reduction to water. However, OOH(ads) easily dissociates over Ptn sites (n⩾2) to OH(ads) and O(ads), the latter forming with a reduction potential greater than 1.23V and the resulting heat loss contributes to the overpotential in the four-electron reduction process.
Subject
Mechanical Engineering,Mechanics of Materials,Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Reference55 articles.
1. Surface Science Studies of Model Fuel Cell Electrocatalysts;Markovic;Surf. Sci. Rep.
2. Role of Structural and Electronic Properties of Pt and Pt Alloys on Electrocatalysis of Oxygen Reduction;Mukerjee;J. Electrochem. Soc.
3. Surface Composition Effects in Electrocatalysis: Kinetics of Oxygen Reduction on Well-Defined Pt3Ni and Pt3Co Alloy Surfaces;Stamenkovic;J. Phys. Chem. B
4. O2 Reduction and CO Oxidation at the Pt-electrolyte Interface. The Role of H2O and OH Adsorption Bond Strengths;Anderson;Electrochim. Acta
5. Oxygen Reduction Reaction on Pt(111): Effects of Bromide;Markovic;J. Electroanal. Chem.
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