Electrochemical Oscillations during Copper Electrodissolution in Hydrochloric Acid Solution

Lifeng Ding, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, PR China
2019 International Journal of Electrochemical Science  
The electrodissolution process of copper anode is widely used in industrial copper-processing, such as electrolysis, electroplating, electrocatalysis, corrosion, and electric machining. Industrial electrochemical processes generally accompany spatiotemporal electrochemical oscillation (EO) phenomena. In this study, the mechanism of periodic EO in the Cu electro-oxidation of hydrochloric acid solution was systematically investigated through experimentation and simulation. The effect of scanning
more » ... imes, concentration of hydrochloric acid, mixing rate, temperature on the EO was studied by using CV, and the effect electric field was studied by current-time under constant potential and the single current step chronopotentiometry way. In theory, it established the reaction mechanism of the system and it was converted into three-variable mathematical model. So the EO was simulated by using Matlab. Theoretical simulation results were consistent with experimental ones. EO occurred as a result of the periodically alternating deposition and dissolution effects of white cuprous chloride deposited through the electro-oxidation of fresh Cu anode. These results provided insight into the relevance among the microchemical mechanisms of the macroscopic nonequilibrium phenomenon.
doi:10.20964/2019.01.63 fatcat:2fnmesaefjembm3on6ke3olu6y