Abstract
Electrodes coated with ion-exchange polymer films are withdrawn from electrolytes under potential control (“emersed”). Apparent electron work functions are calculated from measurements of the Volta-potential differences between a vibrating SnO 2 surface (Kelvin's vibrating capacitor method) and both the emersed electrodes and the electrolytes. To analyze these results theoretical concepts are developed. It is shown that quantitative information on the Donnan potential and on the surface dipole potential of the solvated polymer surface in the emersed state can be derived. The determined surface dipole potential of an emersed polyvinylpyridinium polymer is proposed to be the result of an asymmetric ion-ion double layer. This conclusion is substantiated by infrared reflection-absorption spectra of the emersed coated electrodes.
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