ELECTROCHEMICAL INVESTIGATION OF POROUS MEDIA .2. POTENTIOSTATIC EXPERIMENTS

In an earlier publication, the relations between the current following the application of a potential step or reversal and various variables such as concentration, area, thickness, and applied voltage were derived for several simple models of a porous material soaked in a solution containing an electroactive species. Glass fiber and paper fiber media, soaked in an acidified 2 M KNO3 solution of Hg2(NO3)2 and contacted by mercury electrodes, have been studied by these methods. All the predictions which are independent of the matrix model have been verified. In addition, an acceptable model of pore structure in the paper fiber matrix has been established. None of four simple models fits the experimental results for the glass fiber matrix.