The oxygen reduction reaction mechanism on Pt(1 1 1) from density functional theory calculations

Vladimir Tripković, Egill Skúlason, Samira Siahrostami, Jens K. Nørskov, Jan Rossmeisl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

362 Citations (Scopus)

Abstract

We study the oxygen reduction reaction (ORR) mechanism on a Pt(1 1 1) surface using density functional theory calculations. We find that at low overpotentials the surface is covered with a half dissociated water layer. We estimate the barrier for proton transfer to this surface and the barrier for proton transport parallel to the surface within the half dissociated water network. We find both barriers to be small. The only potentially dependent step is the proton transfer from water to the half dissociated water layer. We find that ORR proceeds via four direct e- reductions without significant peroxide formation. We show that the oxygen-oxygen bond breaking is dependent on the local surface environment. The minimum energy pathway is constructed and we confirm that OH removal from the surface determines the overpotential.

Original languageEnglish
Pages (from-to)7975-7981
Number of pages7
JournalElectrochimica Acta
Volume55
Issue number27
DOIs
Publication statusPublished - 30 Nov 2010

Other keywords

  • DFT
  • Oxygen reduction reaction
  • Pt
  • Reaction mechanism

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