ELECTROCHEMICAL INVESTIGATION OF POROUS MEDIA .3. THEORY OF GALVANOSTATIC METHODS

The measurement of potential following the application of a current step or a current reversal to a porous material soaked in a solution containing an electroactive species offers an advantage in the elucidation of pore structure over the complementary potentiostatic techniques. Theory is presented for both subcritical currents, which lead to an ultimate steady state, and supercritical currents, which engender a transition time. Systems in the absence of a porous material are first considered and then the effect of the matrix is examined in terms of three simple models.