Abstract
To examine the applicability of new forms of PbO2 anodes to chlorine production, potentials of these anodes in the electrolysis of aqueous NaCl solution (300g/l) were measured by a quasistationary galvanostatic method and compared with the potentials measured in the same way for graphite, platinum and RuO2-TiO2 (DSA-type) anodes.
The potentials of the PbO2 anodes were higher than that of the DSA-type anode, but lower than that of the platinum anode. The potential of the α-PbO2 anode was lower than that of the β-PbO2anode, which was about the same as the potential of the graphite anode. The α-PbO2 anode may be suitable for producing NaClO. In the use of the β-PbO2 anode, the addition of surfactants to the anolyte was found to be effective in facilitating the liberation of the bubbles formed on the anode surface and accordingly lowering the potential.
