The kinetics of the (5 × 20) → (1 × 1) structural transition for Au(100) |
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Authors: | P Skoluda and D M Kolb |
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Institution: | Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-1000, Berlin 33, Germany |
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Abstract: | The kinetics of the anion-induced (5 × 20) → (1 × 1) surface structural transition of reconstructed Au(100) electrodes was studied in sulfate-containing solutions by current transients. It is shown that lifting of the reconstruction follows a nucleation-and-growth type behavior which can be described by the Avrami equation. Moreover, for high positive potentials, i.e., high anion coverages, the current-transient analysis reveals instantaneous nucleation, whereas for low transition overpotentials and long transition times a mechanism with constant transition rate prevails. Apparent activation energies, which depend strongly on the electrode potential, are derived from the temperature dependence of the Avrami plots. |
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