USE OF DYNAMICALLY ADAPTIVE-GRID TECHNIQUES FOR THE SOLUTION OF ELECTROCHEMICAL KINETIC-EQUATIONS .3. AN ADAPTIVE MOVING GRID ADAPTIVE TIME-STEP STRATEGY FOR PROBLEMS WITH DISCONTINUOUS BOUNDARY-CONDITIONS AT THE ELECTRODES

The finite-difference adaptive moving grid strategy suggested in Parts 1 and 2 for the solution of electrochemical kinetic one-dimensional partial differential equations has been further extended to allow temporal grid adaptation as well as time-stepping across discontinuities in boundary conditions. This extension aims at the development of a general simulation algorithm, capable of a largely automatic solution of a variety of kinetic problems. The validity of the strategy developed has been tested on three examples of the modelling of electrochemical transients: square-wave-controlled potential transient in pure diffusion conditions, potential-step transient for the catalytic electrode reaction mechanism with a fast homogeneous reaction and linear potential scan voltammetric transient for an electrode reaction accompanied by a fast follow-up homogeneous dimerization reaction.