APPLICATION OF THE SIMULTANEOUS ANALYSIS OF DATA FROM AN AC QUARTZ-CRYSTAL MICROBALANCE AND IMPEDANCE SPECTROSCOPY IN THE INVESTIGATION OF ELECTROCHEMICAL KINETICS

The use of a quartz crystal microbalance under ac conditions makes it possible to determine the electrogravimetric transmittance. This metho d has proved to be a very promising technique for in situ electrochemi cal investigations. ne sensitivity of a quartz crystal microbalance on the nanogram level permits the real-time observation of the variation of the mass during the dissolution, precipitation, and formation of f ilms. Simultaneous measurement of the electrochemical impedance and th e electrogravimetric transmittance offers an effective tool for studyi ng reaction mechanisms. The technique makes it possible to evaluate th e atomic weight of adsorbed intermediates of multiple-step reactions o r ions inserted into a film, as well as to separate the fluxes of anio ns and cations entering or leaving a film.