h IJIx tends to zero for increasing values of n (Fig. 10);

It may be considered that the comparison of the absolute value I20 for carbon materials gives a classification of these materials, as well as the relative value I2o/Ii-the most suitable materials are characterized by the highest values of both 120 and I2o/Ii. It was observed that low values of / 20//i were generally correlated with high values of the intensity of the passivation peak at 2.5 V and that the corresponding materials were not suitable for electrolysis [43].