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Structure of Momolayers of Silicotungstate Anions on Ag(111) and Au(111) Electrode Surfaces

Published online by Cambridge University Press:  10 February 2011

Maohui Ge ,
Brian K. Niece ,
Craig G. Wall ,
Walter G. Klemperer  and
Andrew A. Gewirth
Maohui Ge
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Brian K. Niece
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Craig G. Wall
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Walter G. Klemperer*
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Andrew A. Gewirth*
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
*
* Authors to whom correspondence should be addressed.
* Authors to whom correspondence should be addressed.
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Abstract

α-Dodecatungstosilicate (α-SiW12O404−) anions form ordered monolayers on Ag(111) and Au(111) surfaces. In-situ STM images reveal that the silicotungstate ion forms a square adlattice with an intermolecule spacing of 10.2 ± 0.5 Å on both Ag and Au surfaces. Additional structures exhibiting either row or rhombic motifs are observed on Au electrodes. The structure of the adlattices can be modeled using a simple model which maximizes the coordination of the silicotungstate ion to the electrode while maintaining van der Waals contacts between terminal oxygens of adjacent silicotungstates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 451: Symposium P – Electrochemical Synthesis and Modification , 1996 , 99
Copyright
Copyright © Materials Research Society 1997

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