Anion exchange phenomena inside various functional coatings have been investigated by means of impedance measurements. Emphasis is given to the selectivity of anions that would allow the application to ion-selective electrodes based on electrolyte/insulator/semiconductor devices. The selectivity of anion exchange with respect to anion type follows the empirical Hofmeister sorting series. But other parameters are also operating such as the chemical nature of the anionic sites and the possible anion-dependent swelling of the electrode’s coating by the solvent.
H. Touzi, Y. Chevalier, R. Kalfat, N. Jaffrezic-Renault
anion exchange, ion selectivity, impedance measurements