Percolation in Electroactive Polymers Basic Concepts

CHARGE PERCOLATION IN ELECTROACTIVE POLYMERS BASIC CONCEPTS 

FIGURE 1.2. A ruthenium-containing poly(vinylpyridine) redox polymer. 

FIGURE 1.4. Schematic representation of charge injection/extraction at the electrode/ polymer interface and the quasi-diffusional charge percolation process (electron hopping) in a surface-immobilized electroactive polymer film. 

A good recent summary of this topic has been provided by Majda. To model the process of charge percolation, it is convenient to assume that redox centers A and B, where A is an electron acceptor (oxidized species) and B is an electron donor (reduced species), are distributed uniformly throughout the layer. 

We then assume that the layer can be divided into a series of slices, 1,2,3. - 1, . Each slice contains a redox site. The overall layer thickness is given by L. The process of charge percolation through the layer is then represented in terms of the following reaction  

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