HYSTERESIS EFFECT OF MAGNETIC-FIELD ON ELECTRON-TRANSFER PROCESSES INELECTROCHEMICAL REACTION

Using magnetohydrodynamic electrodes (MHDE), a hysteresis effect of th e magnetic field on the electron transfer process in the copper deposi tion in a CuSO4 solution with 1 M H2SO4 as a supporting electrolyte wa s examined. MHDE are new type electrodes to analyze electrochemical re actions, utilizing the electrolyte solution flow induced by the Lorent z force which can regulate the flow velocity to enhance the mass trans fer of active species, ultimately until the current becomes equal to t he reaction current corresponding to the rate of electron transfer. Fr om the experimental results, it was shown that the reaction current ob served gives a larger value at the first stage of the reaction. Howeve r, the current decreases and takes two different values depending on t he mode how to apply the magnetic field to the electrode system, i.e., decreasing or increasing the magnetic flux density.