SIMULTANEOUS DETERMINATION OF CHLORINE AND OXYGEN-EVOLVING AT RUO2 TIAND RUO2-TIO2/TI ANODES BY DIFFERENTIAL ELECTROCHEMICAL MASS-SPECTROSCOPY/

Chlorine and oxygen evolving at RuO2/Ti and RuO2-TiO2/Ti anodes have b een simultaneously determined at electrode potentials from 1.0 to abou t 2 V (vs Ag/AgCl) by differential electrochemical mass spectroscopy ( DEMS). On the RuO2/Ti anodes, the threshold electrode potential for ox ygen evolution increased with a decrease in RuO2 loading, while the ch lorine evolution potential was unchanged. Low RuO2 loading anodes gave a high chlorine evolution ratio under various constant electrolysis p otentials. On the RuO2-TiO2/Ti anodes, the threshold electrode potenti al for oxygen evolution increased with an increase in the TiO2 content more remarkably than that for chlorine evolution. High TiO2 content a nodes gave a high chlorine evolution ratio at various constant electro lysis potentials. The combination of RuO2 and TiO2 exhibits a remarkab le effect with respect to the enhancement of chlorine evolution select ivity.