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Volume 121, 2002
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Potential dependence of step and kink energies on Au(100) electrodes in sulfuric acid

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Abstract

Using electrochemical STM we studied monolayer high Au islands on Au(100) electrodes in sulfuric acid as a function of the electrode potential. We made use of theoretical and experimental methods recently developed for UHV experiments on metal islands. It is demonstrated that these models are likewise applicable to islands on metal electrodes in a liquid environment. From a quantitative analysis of the equilibrium island shape and of the island shape fluctuations we determined the step free energy (line tension) as a function of orientation and the kink energy, and the dependence of these quantities on the electrode potential. In a first approach to a theoretical understanding the electrostatic contributions to the line tension are considered. It is concluded that these contributions should add significantly to the observed variation with the potential. This fails however to provide essential features of the experimental result.

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Publication details

The article was received on 19 Nov 2001, accepted on 21 Jan 2002 and first published on 29 Apr 2002


Article type: Paper
DOI: 10.1039/B110642M
Citation: Faraday Discuss., 2002,121, 27-42
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    Potential dependence of step and kink energies on Au(100) electrodes in sulfuric acid

    S. Dieluweit, H. Ibach and M. Giesen, Faraday Discuss., 2002, 121, 27
    DOI: 10.1039/B110642M

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