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Method of Separation and Determination of the Characteristics of the Adsorbed and Nonadsorbed States of Electroactive Substances on Electrodes

Authors :
Zbigniew Galus
Marta Łobacz
Marek Orlik
Jadwiga Stroka
Source :
Langmuir. 18:2765-2770
Publication Year :
2002
Publisher :
American Chemical Society (ACS), 2002.

Abstract

The electrochemical analysis of the properties of the adsorbed reactant state for the case when it is energetically close to the nonadsorbed state of the electroactive species is presented. The method of separation of thecorresponding adsorption and adsorption-free contributions to the overall faradaic response, which may also supply the voltammetric properties of adsorbed state, is given. It is based on recording, for a given solution, two normal pulse, charge-potential (voltocoulometric) curves. The first curve is obtained by integration of the faradaic current over the entire duration of the potential pulse t (Q t -E curve). For the second curve the charge is measured with the exclusion of the first millisecond after the application of the potential pulse (Q t - 1 vs E curve). The numerical model of such dependencies proves that the shape of their difference AQ = Q t - Q t - 1 as a function of the electrode potential satisfactorily approximates the electrochemical properties of the adsorption state. Such an approach is recommended as a simple way of analysis of the properties of the adsorption state of electroactive substances which do not yield a distinct separate faradaic response from the adsorption state.

Details

ISSN :
15205827 and 07437463
Volume :
18
Database :
OpenAIRE
Journal :
Langmuir
Accession number :
edsair.doi...........aa63a9987ce423841def409a41ebb9a6
Full Text :
https://doi.org/10.1021/la011046o