THE POLYMER ELECTROLYTE ELECTRODE INTERFACE

The electrochemical reaction of the Fe2+/Fe3+ couple in high molecular weight, solid, poly(ethylene oxide) has been studied. The kinetic par ameters (including the electrochemical rate constant for charge transf er) of the system under investigation have been obtained by employing ac impedance measurements at ultramicroelectrodes (disk of 12.5 mu m r adius). Ac impedance at a microelectrode has proved to be a powerful m ethod with which to study redox reactions in solid polymer systems cha racterised by low conductivity and diffusion coefficients.