材料期刊网

A Mach-Zehnder interfeometer is employed to visualize the mass transfer processes at the electrode/electrolyte interface during the potentiodynamic sweep of the Pt electrode in 0.1 mol dm(-3) K4Fe(CN)(6) with 0.5 mol dm(-3) KCl solution at 20 mV s(-1). The changes of solution's refractive index, brought about by the mass transfer during the reaction, can be recorded in situ in interferograms. The distributions of the optical path difference are obtained by numerical reconstruction of interferograms to reflect changes of solution's refractive index and the mass transfer processes. The mass transfer of [Fe(CN)(6)](4-) and [Fe(CN)(6)](3-) is presented visually. This method provides a new approach to detect the mass transfer processes at the electrode/electrolyte interface in real-time.