| Autor: |
E. G. Tolstopyatova, S. N. Sazonova, V. V. Kondrat'ev, V. V. Malev |
| Předmět: |
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| Zdroj: |
Russian Journal of Electrochemistry; Sep2004, Vol. 40 Issue 9, p930-936, 7p |
| Abstrakt: |
Charge transfer in poly(3-octylthiophene) films in 0.050.5 M LiClO4 solutions in acetonitrile is studied by an electrochemical impedance method. The resistance to charge transfer Rct and the capacitance of the electrical double layer Cdl are calculated from the high-frequency semicircle and referred to the film/electrolyte interface. The low-frequency capacitance Clf and effective diffusion coefficient Def are determined by analyzing the region of medium and low frequencies. The discrepancies between potential dependences of Clf and Def derived experimentally and calculated within a simple model for a redox film are analyzed. The assumption is made that additional factors, such as a macroporous character of the films and the change in their properties during oxidation, which results from the film swelling, the change in the film volume and the solvation character, should be taken into account. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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