P25 Cu(Ⅱ)イオンの電気化学還元過程における超音波照射の影響

抄録

The mechanism of electrochemical reduction of copper (II) ion on glassy carbon has been investigated under the influence of power ultrasound (20 kHz), using voltammetry and electrochemical impedance spectroscopy (EIS). The experiments were conducted with a sonoelectrochemical cell, placing an ultrasound probe directly above the working electrode. Ultrasound was found to have a significant effect on the electrodeposition rate of copper especially in hydrogen co-deposition potential range. It is suggested that the ultrasound plays an important role in ensuring mass transport, and suppressing hydrogen evolution at the electrode surface. The kinetic parameters of the copper electrodeposition reaction obtained by Tafel plot and EIS measurement lead to the conclusion that ultrasound promotes the electron transfer process arising from both thermal effect and surface activation effect by ultrasonic cavitation.