Potential profile of electrolytic cell and influence of electrolyte resistance in three-electrode electrochemical testing

Abstract

Electrochemical simulation model along with its underlying theories, have been widely applied in various engineering fields. While electrochemical simulation models provide valuable insights, errors in analysis due to overlooked preconditions, inappropriate data treatments, and misunderstood concepts may compromise model accuracy and actual practical applicability. Based on the measurement principles of electrochemical workstations, this study explains the true significance of the data obtained from electrochemical measurements and analyzes the sources of errors. A one-dimensional three-electrode electrolytic cell model is established to simulate the potential profile across the entire electrolytic cell, and the difference between the measured value and the theoretical value is explained. Furthermore, a flat-plate corrosion electrolytic cell with an adjustable reference electrode position is designed. By comparing actual electrochemical measurements with three-dimensional electrolytic cell simulation under identical condition, the impact of changes in reference electrode position on electrolyte resistance, potential profile, and electrochemical test results is investigated. Finally, strategies for minimizing or correcting measurement errors are proposed to obtain more accurate electrochemical parameters, thereby improving the precision of simulation model.