Mathematical modelling for the preparation of platinum-solid-polymer-electrolyte by counter-current diffusion

A mathematical model is proposed for the counter-current diffusion of hexac hloroplatinic acid in perfluorinated Nafion membranes using sodium borohydr ide as a reducer. The model equations are employed to describe the metallic platinum (Pt) concentration profiles across the membrane. Diffusivities ar e obtained from permeation measurements and then the theoretical data are c ompared with experimental results which are obtained by electron dispersive microanalysis spectroscopy. There is a good agreement between the simulate d model equation and the experimental results. It is expected that this mod el can provide an idea of the development of the new Pt-solid-polymer-elect rolyte (Pt-SPE) electrode. (C) 1999 Elsevier Science S.A. All rights reserv ed.