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Oxygen Reduction on Structurally Well Defined, Bimetallic PtRu Surfaces: Monolayer PtxRu1−x/Ru(0001) Surface Alloys Versus Pt Film Covered Ru(0001)

Authors
  • Brimaud, S.1
  • Engstfeld, A. K.1
  • Alves, O. B.1
  • Hoster, H. E.1, 2
  • Behm, R. J.1
  • 1 Ulm University, Institute of Surface Chemistry and Catalysis, Ulm, 89069, Germany , Ulm (Germany)
  • 2 TUM CREATE Centre for Electromobility, 62 Nanyang Drive, Singapore, 637459, Singapore , Singapore (Singapore)
Type
Published Article
Journal
Topics in Catalysis
Publisher
Springer US
Publication Date
Oct 23, 2013
Volume
57
Issue
1-4
Pages
222–235
Identifiers
DOI: 10.1007/s11244-013-0177-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

The electrocatalytic activity of different, structurally well defined bimetallic PtRu surfaces in the oxygen reduction reaction was investigated by a combination of scanning tunnelling microscopy and electrochemical measurements performed under controlled mass transport conditions in a flow cell. We compare the effect of pseudomorphic Pt cover layers, mimicking the situation in a core–shell Pt/Ru nanoparticle, and of mixed PtxRu1−x monolayer surface alloys, reflecting the situation in an alloyed nanoparticle. The results unambiguously demonstrate that these bimetallic surfaces can reach activities well in excess of that of Pt(111), both for the film surfaces and the surface alloys, by optimizing the Pt surface content (surface alloys) or the Pt film thickness (film surfaces). The results are compared with simulated kinetic current–potential profiles based on existent density functional theory calculations (Greeley and Nørskov, J Phys Chem C 113:4932, 2009; Lischka et al., Electrochim Acta 52:2219, 2007) revealing very good agreement in trends. Potential and limits of this approach are discussed.

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