On the dilemma of the use of the electroneutrality constraint in electrochemical calculations

A simple treatment is developed to demonstrate that invoking the electroneutrality assumption to solve electrochemical transport problems is equivalent to invoking the limit of the exact (Nernst-Planck-Poisson) treatment when certain charge-density-related terms become negligibly small. (C) 2000 Elsevier Science S.A. All rights reserved.