Thin film-modified electrodes: a model for the charge transfer resistance in electrochemical impedance spectroscopy
- 436 Downloads
A simple but general model is derived for the charge transfer resistance for a solution phase redox couple reacting at an electrode modified with a thin film such as a self-assembled monolayer. The layer itself is non-electroactive but changes the impedance response by virtue of altering the solubilities and diffusion coefficients of the electroactive species within the layer as compared to bulk solution. Such effects can give the illusion of altered electron transfer characteristics.
KeywordsModified electrodes Electrochemical impedance spectroscopy Thin film Self-assembled monolayer Charge transfer resistance
The research leading to these results has received partial funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement No. 320403.
- 3.Murray RW, Ewing AG, Durst RA (1987) Chemically modified electrodes: molecular design for electroanalysis. Anal Chem 59(5):379 A–390 AGoogle Scholar
- 17.Diard J-P, Glandut N, Gorrec BL, Montella C (2004) EIS study of the FeIII/FeII redox couple at a Nafion®-coated Pt electrode. J Electroanal Chem 566(2):269–280Google Scholar