A STUDY OF THE DEPENDENCE OF FERROCENE DIFFUSION ON CHAIN-LENGTH IN POLYMER ELECTROLYTES

The diffusion rates of ferrocene have been estimated in five kinds of poly(ethylene glycol) solution, containing the electrolyte LiClO4, by using non-steady-state chronoamperometry. The D-app of ferrocene incre ases with increasing temperature, and the dependency of D-app on tempe rature obeys the Williams-Landel-Ferry equation. The D-app of ferrocen e decreases with increasing polymer chain length. Both the chain lengt h and temperature dependence conform to a simple free volume model. A relation between current and polymer chain length is suggested at room and high temperatures.