Electrochemical dissolution of surface alloys in acids: Thermodynamic trends from first-principles calculations

Jeffrey Philip Greeley, Jens Kehlet Nørskov

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A simple procedure is introduced to use periodic Density Functional Theory calculations to estimate trends in the thermodynamics of surface alloy dissolution in acidic media. With this approach, the dissolution potentials for solute metal atoms embedded in the surface layer of various host metals (referenced to the dissolution potential of the solute in its pure, metallic form) are calculated. Periodic trends in the calculated potentials are found to be related to trends in surface segregation energies of the various solute/host pairs. The effects of water splitting and concomitant hydroxyl adsorption on the dissolution potentials are also considered; these effects do not change the potentials for highly oxophilic solutes embedded in less active hosts, but they do decrease the dissolution potential for more inert solutes on oxophilic hosts. Finally, the dissolution of Pt "skin" layers from Pt3X (X = Fe, Co, and Ni) bulk alloys is analyzed; the Pt skins are found to be stabilized compared to pure Pt.
Original languageEnglish
JournalElectrochimica Acta
Volume52
Issue number19
Pages (from-to)5829-5836
ISSN0013-4686
DOIs
Publication statusPublished - 2007

Keywords

  • underpotential deposition
  • acids
  • fuel cells
  • stripping
  • density functional theory
  • surface alloys
  • dissolution
  • leaching

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