POROUS-ELECTRODES IN THE PRESENCE OF A CONCENTRATION GRADIENT

Solutions for the flooded porous electrodes in the presence of a conce ntration gradient are presented. They are valid for quasi-reversible r eactions in the conditions of finite pore length. Potential and concen tration profiles can be calculated using the developed method. In addi tion, a.c. impedance behavior of these electrodes is presented. Transi tions from concentration gradient to potential gradient limitations ar e discussed. The method is applied to the hydrogen evolution on porous electrodes. (C) 1997 Elsevier Science S.A.