Study Of The Influence Of Ultrasound Power And Frequency On The Rate Of Electrochemical Process

1 Effects of ultrasonic power on the electrochemical reductions of Fe(CN)₆^3-/Fe(CN)₆^4-and Cu²⁺/CuVoltammograms for the electrochemical reduction of Fe(CN)₆^3- and Cu²⁺ were recorded under silent and sonicated conditions, as various power between 110W and 500W. The effects of the application of different ultrasonic power on the processes of the electrochemical reduction of Fe(CN)₆^3- and Cu²⁺, from silent conditions to 500W, were investigated.Ultrasound is found to have significant effect on the electrochemical reduction of Fe(CN)₆^3- and Cu²⁺, and the current densities of the electrochemical reduction of Fe(CN)₆^3- and Cu²⁺ increase from silent conditions to 500W. Enhancement of ultrasound on the electrochemical reduction of Fe(CN)₆^3- is different with that of Cu²⁺. For the electrochemical reduction of Fe(CN)₆^3-, processes are all of diffusion control at various ultrasonic power, at the same time, the limiting current densities increase with ultrasonic power. For example, the limiting current densities increases from 12.0 A·m^-2 to 33.4 A·m^-2 with increasing ultrasonic power from 110 W to 500 W on ultrasonic frequency of 24kHz in aqueous of 2.0×10^-3 mol·L^-1 K3Fe(CN)6 at 25℃. But for the electrochemical reduction of Cu²⁺, the electrochemical reduction of Cu²⁺ is not controlled by mass transport as ultrasonic power is increased above about 330W.The effect of ultrasonic power on the electrochemical reduction of Fe(CN)₆^3- and Cu²⁺ at 25℃, 45℃and 65℃is investigated, respectively. The experimental results show that the degree of enhancement increases with increasing ultrasonic power at...