Charge neutralization process of mobile species at any distance from the electrode/solution interface. 1. Theory and Simulation of concentration and concentration gradients developed during potentiostatic conditions

FERNANDO GARAY ; CESAR A. BARBERO

American Chemical Society

Lugar: Washington, DC ; Año: 2006 vol. 78 p. 6733 - 6733

span lang="en" style="font-size: 12pt; font-family: "Times New Roman";">The theoretical framework of a general model for the simulation of concentration profiles of electroactive and nonelectroactive species, driven by an electrochemical process under potentiostatic conditions, is presented. Based on this analysis, finite differences simulations are performed to calculate the actual profiles under different experimental conditions. Furthermore, the effect of experimental parameters (diffusion coefficients of the ions of the redox couple or the supporting electrolyte, charge of the different species, etc.) on the concentration profiles is also examined. The results obtained when low and high concentrations of supporting electrolyte are compared aid understanding of the effect of the electrolyte on the measurements. The presented model also underlines the role of supporting electrolyte species when nonspecific techniques are employed to measure the concentration changes produc