Digital Simulation of Cyclic Chronopotentiometry and Cyclic Reciprocal Derivative Chronopotentiometry for Linear Adsorption Systems

Abstract

Digital simulations were applied to generate potential-time response curves for cyclic chronopotentiometry under a constant current in order to gain insight into a reversible charge transfer process at a planar electrode under semi-infinite diffusion conditions. These simulations were carried out for two-species systems in which either both or just one component undergoes adsorption, and this process can be accurately described using the Henry isotherm. From the chronopotentiometric curves obtained, and following their numerical differentiation, the corresponding cyclic reciprocal derivative chronopotentiometric curves were generated and compared with the previously reported analytical solutions. The results obtained according to the proposed simulation scheme were shown to be in perfect agreement with the analytical solutions. It was also demonstrated that digital simulations are a powerful and versatile tool for studying and modeling two-species adsorption systems.