Adsorption configuration and local ordering of silicotungstate anions on Ag(100) electrode surfaces

L. Lee, J. X. Wang, R. R. Adžić, I. K. Robinson, Andrew A Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

X-ray reflectivity, cyclic voltammetry, and scanning tunneling microscopy (STM) are used to examine the structure of α-SiW12O44- or silicotungstic acid (STA) adsorbed on Ag(100) in acid solution. The voltammetry shows that STA passivates the Ag surface relative to electron transfer to a solution redox species. STM images reveal the formation of a series of lattice structures, one of which can be associated with a commensurate (√13×√13)R33.69° structural model. X-ray reflectivity measurements show uniquely that STA orients with its four-fold axis perpendicular to the Ag(100) surface and that the center of the STA molecule is 4.90 Å above the top layer of the Ag substrate. Analysis of bond lengths leads to a footprint of STA on Ag(100), in which the four terminal O atoms are located near the hollow sites and have a Ag - O bond length of 2.06 Å. This bond length is consistent with a strong covalent interaction between STA and the Ag surface.

Original languageEnglish (US)
Pages (from-to)8838-8843
Number of pages6
JournalJournal of the American Chemical Society
Volume123
Issue number36
DOIs
StatePublished - Sep 12 2001

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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