Diffusion permeability of perfluorosulfocation-exchange membrane MF-4SK with respect to molecular oxygen

Abstract

We have worked out the kinetics of molecular oxygen electroreduction on the rotating graphite
electrode and graphite electrode covered with MF-4SK membrane. The presence of MF-4SK membrane
on the electrode surface does not change the four-electron mechanism of oxygen electroreduction reaction
but brings the diffusion restrictions at the process rate. The diffusion coefficient of oxygen into MF-4SK
sulfocation-exchange membrane deposited on the graphite surface has been defined by voltammetric
method with linear scan rate of potential. The diffusion coefficient of oxygen into MF-4SK membrane is
thirty times less in comparison with the diffusion coefficient of molecular oxygen in the bulk solution