Abstract
Results of an investigation of the Ag/AgI, I− electrode impedance in 0.01 mol dm−3 KNO3 as the supporting electrolyte are reported. By analysis of frequency dispersion of the electrode admittance, relaxation spectra and Cole-Cole complex admittance dispersion, two independent, parallel processes occurring in the interphasial region are clearly recognized. These processes are identified as a diffusion-controlled charge-transfer process which is dominant at higher I− concentrations and a reactant adsorption process dominant at lower I− concentrations. Experimental data are analysed and interpreted according to theoretical equations derived for the reversible electrode reaction coupled with reactant adsorption, which yields four frequency-independent parameters describing the whole electrode process. These parameters are discussed, particularly with regard to their dependence on the I− concentration in the electrolyte solution.
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