Anionexchange membrane ma-41 surface morphology effect on ion transfer mechanism under identical diffusion layer thickness conditions
Keywords:
surface morphology, limiting current, anionexchange membrane, rotating membrane disk, ion transfer.Abstract
Using the rotating membrane disk method current-voltage characteristic of heterogeneous
anionexchange membrane MA-41 were measured under different rotating velocities. It was shown that
experimental limiting currents are much lower than calculated by the Levich’s theory for anionexchange
membranes with homogeneous surface. The model describing the limiting state formation mechanism,
considering presence of active conductive sites and inert regions at the membrane surface, was proposed.
It was determined, that contribution of the electroconvective electrolyte transport through the membrane,
which leads to increase in the limiting current values is small, and that dominant is mechanism reducing
the mass transfer related with the membrane surface microheterogeneity
