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Halide Electroadsorption on Single Crystal Surfaces

Published online by Cambridge University Press:  10 February 2011

B. M. Ocko  and
Th. Wandlowski
B. M. Ocko
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, N.Y. 11973
Th. Wandlowski
Affiliation:
Department of Electrochemistry, University of Ulm, D-89069, Ulm, Germany
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Abstract

The structure and phase behavior of halides have been investigated on single crystals of Ag and Au using synchrotron x-ray scattering techniques. The adlayer coverages are potential dependent. For all halides studied we found that with increasing potential, at a critical potential, a disordered adlayer transforms into an ordered structure. Often these ordered phases are incommensurate and exhibit potential-dependent lateral separations (electrocom-pression). We have analyzed the electrocompression in terms of a model which includes lateral interactions and partial charge. A continuous compression is not observed for Br on Ag(100). Rather, we find that the adsorption is site-specific (lattice gas) in both the ordered and disordered phases. The coverage increases with increasing potential and at a critical potential the disordered phase transforms to a well-ordered commensurate structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 451: Symposium P – Electrochemical Synthesis and Modification , 1996 , 55
Copyright
Copyright © Materials Research Society 1997

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References

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