Mass transport processes oxygen utilization

The rate of oxygen evolution is lower at high NaCl concentrations. However, recycling the electrolytic solution to the undivided cell is cumbersome, and so the utilization of NaCl decreases. Modem processes use relatively dilute NaCl solutions to improve the utilization of the salt. Many electrolyzers use platinized titanium or DSA electrodes. Operation at high current densities increase the yield because the rates of the loss reactions (24) and (25) are independent of current density. Finally, agitation of the solution promotes undesirable mass transport of OCl to the electrodes. 

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