REDUCING SYSTEMS OF ION TRANSPORT EQUATIONS TO SYSTEMS OF EQUATIONS OF MULTI-COMPONENT DIFFUSION IN NON-ELECTROLYTIC SOLUTIONS

摘要

A simple iterative method is proposed which reduces the solution of ionic transfer equations in electrochemical systems to the solution of the equation of multi-component diffusion in non-electrolytes. The method can be used for both dilute and concentrated electrolytes and it permits use of existing computer programs for heat transfer when calculating the ionic concentrations. For application of this method it is necessary that the current density be determined from the boundary condition or it can be evidently expressed as a function of the concentration distributions. This can be achieved for one-dimensional systems, in the case of a uniformly accessible surface, in the boundary layer approximation, and in the case of steady-state transfer in motionless electrolytes. Examples of the application of the method are given for the unsteady discharge of hydrogen ions from HCl + KCl solutions and for simultaneous deposition of two metals onto a disk electrode. [References: 28]