Deprotonated Water Dimers: The Building Blocks of Segmented Water Chains on Rutile RuO2(110)

Rentao Mu, David C. Cantu, Vassiliki Alexandra Glezakou, Igor Lyubinetsky, Roger Rousseau, Zdenek Dohnálek

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Despite the importance of RuO2 in photocatalytic water splitting and catalysis in general, the interactions of water with even its most stable (110) surface are not well understood. In this study we employ a combination of high-resolution scanning tunneling microscopy imaging with density functional theory based ab initio molecular dynamics, and we follow the formation and binding of linear water clusters on coordinatively unsaturated ruthenium rows. We find that clusters of all sizes (dimers, trimers, tetramers, extended chains) are stabilized by donating one proton per every two water molecules to the surface bridge bonded oxygen sites, in contrast with water monomers that do not show a significant propensity for dissociation. The clusters with odd number of water molecules are less stable than the clusters with even number and are generally not observed under thermal equilibrium. For all clusters with even numbers, the dissociated dimers represent the fundamental building blocks with strong intradimer hydrogen bonds and only very weak interdimer interactions resulting in segmented water chains.

Original languageEnglish
Pages (from-to)23552-23558
Number of pages7
JournalJournal of Physical Chemistry C
Volume119
Issue number41
DOIs
Publication statusPublished - Oct 15 2015

ASJC Scopus subject areas

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

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