Structure of water layers on hydrogen-covered Pt electrodes

Tanglaw Roman, Axel Groß

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

The structure of water layers above hydrogen-covered Pt(1 1 1) surfaces at room temperature has been studied by ab initio molecular dynamics simulations based on periodic density functional theory calculations. Fully hydrogen-covered Pt(1 1 1) with additionally either a hydrogen vacancy or another hydrogen adatom have been considered. The resulting structures have been analyzed in detail as a function of the hydrogen coverage. In particular, the thermal disorder in the water layer is examined in terms of deviations from the ice lattice, orientational inhomogeneity within a water bilayer, as well as the onset of proton transfer. On hydrogen-covered Pt(1 1 1), the water layer is located at a much larger distance from the Pt atoms than on the pure metal surfaces. Surprisingly, the more weakly bound water layer on the hydrogen-covered Pt(1 1 1) electrode exhibits a greater order than the water layer on clean Pt(1 1 1) which is attributed to the stronger water-water interaction above hydrogen-covered Pt(1 1 1). The relevance of our findings for the understanding of electrochemical electrode/water interfaces is discussed.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalCatalysis Today
Volume202
DOIs
Publication statusPublished - 15 Mar 2013
Externally publishedYes

Keywords

  • Computer simulations
  • Density functional theory calculations
  • Hydrogen
  • Low index single crystal surface
  • Molecular dynamics
  • Platinum
  • Water

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