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by Maryam Hosseini Aliabadi, Majid Jafarian, Fridon Gabal, Mohammad Mahjani
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Electroreduction of oxygen on silver deposited on glassy carbon electrode and modified by copper deposition is investigated by cyclic voltammetery, polarization measurement and AC Impedance spectroscopy where rotating disk electrode (RDE) has been employed. The mechanism and kinetic parameters of the reaction are compared in two cases. In both, electrode reaction follows 4e pathway and the synergetic effects of adding Cu to Ag improved the electrochemical activity of the electrode. This improvement was confirmed by AC impedance results. The calculated Tafel plots show the electron transfer reaction is rate determining step. Complex capacitance spectrum shows the occurrence of pure charge transfer and consecutive surface adsorption and diffusion on electrode