Hydroxylation structure and proton transfer reactivity at the zinc oxide-water interface

David Raymand, Adri C.T. Van Duin, William A. Goddard, Kersti Hermansson, Daniel Spångberg

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

The hydroxylation structural features of the first adsorption layer and its connection to proton transfer reactivity have been studied for the ZnO-liquid water interface at room temperature. Molecular dynamics simulations employing the ReaxFF forcefield were performed for water on seven ZnO surfaces with varying step concentrations. At higher water coverage a higher level of hydroxylation was found, in agreement with previous experimental results. We have also calculated the free energy barrier for transferring a proton to the surface, showing that stepped surfaces stabilize the hydroxylated state and decrease the water dissociation barrier. On highly stepped surfaces the barrier is only 2 kJ/mol or smaller. Outside the first adsorption layer no dissociation events were found during almost 100 ns of simulation time; this indicates that these reactions are much more likely if catalyzed by the metal oxide surface. Also, when exposed to a vacuum, the less stepped surfaces stabilize adsorption beyond monolayer coverage.

Original languageEnglish (US)
Pages (from-to)8573-8579
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number17
DOIs
StatePublished - May 5 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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