Impedance study of adsorption of iodide ions at Bi(001) electrode from the aqueous solutions with constant ionic strength

Abstract

Abstract The adsorption of iodide ions from the aqueous solution with constant ionic strength on the Bi(0 0 1) single crystal plane electrode has been studied by impedance spectroscopy. The complex impedance plane and Bode plots have been fitted and analyzed, using the non-linear regression analysis method. The probable limiting kinetic steps of the process were obtained and discussed. At moderate ac frequency (from 1 Hz to 10 Hz) the adsorption process of the I − ions is limited mainly by a slow adsorption stage. In the region of intensive increase of the differential capacitance in the capacitance vs. electrode potential curves ( E