Characterization and identification of partially blocked electrodes |
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Authors: | O. Contamin E. Levart |
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Affiliation: | Laboratoire d''Electrochimie Intefaciale du C.N.R.S., Bellevue, F 92190 Meudon France |
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Abstract: | A new method for the characterization of partially covered electrodes is proposed. It is based on the formal analogy between such electrodes and those having a first-order chemical reaction associated with the charge transfer. It consists in making use of the two linear segments in Z(s? appearing on some specified conditions on the operational impedance spectrum obtained for semi-infinite diffusion. To avoid confusion between these two types of electrode, an identification method is proposed, involving the measurements of diffusion-limiting currents on a RDE. Analysis of the limits of validity of these methods leads to the conclusion that most inhibiting coverages fulfilling the conditions necessary for their characterization should not be mistaken for a chemical reaction. |
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