Publication
525
J. Phys.Chem.
B., 105 (2), 444
-448, 2001
DOI: 10.1021/jp001565k S1089-5647(00)01565-0 |
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Electron Transfer through a Modified Electrode with a Fractal Structure: Cyclic Voltammetry and Chronoamperometry Responses
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Claude P. Andrieux, and Pierre
Audebert
Contribution from the Laboratoire
d'Electrochimie Moléculaire de l'Université Denis
Diderot (Paris 7), UMR CNRS 7591, 2 place Jussieu,
75251 Paris Cedex 05, France , and the Laboratoire de Photophysique et Photochimie
Supramoléculaires et Macromoléculaires, Ecole Normale Supérieure de Cachan, 61
Av. du Pt Wilson, 94235 Cachan, France
The problem of charge transfer by electron hopping
through a volumic-modified
electrode with a fractal structure was addressed,
both in the case of
chronoamperometry and linear sweep voltammetry.
A behavior intermediate between
that seen in classical diffusion and that of
a thin layer was found. The
currents in chronoamperometry and the peak currents
in cyclic voltammetry both
depend linearly on a bilogarithmic scale with,
respectively, the time and the
scan rate. The slopes of the curves in both cases
depend on the fractal
dimension, provided the spectral dimension remains
constant. Plots are given in
the case where the spectral dimension is equal
to 4/3. |
