Effect of Current Density

The effect of the variation in active chlorine production as a function of the density of applied current for the anodes is illustrated in figure 8.

For the Ti/Pt and Ti/RuO2 anodes, the AC increases almost linearly with increase of current density. A somewhat different tendency is observed for graphite anodes. In fact, AC increases up to a maximum of about 12 g/l at 20 A/dm2; beyond this value, it diminishes abruptly. The fact that the graphite anode could not tolerate a high current density can explain the phenomena observed. Beyond a current density of 20 A/dm2, reactions of chlorate formation and oxygen development take the upper hand. In contrast, Ti/Pt and Ti/RuO2 anodes bear higher current densities without problems, and concentration of AC increases, even though with lesser yields.

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