Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (02): 134-138.doi: 10.3866/PKU.WHXB19900203

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Kinetics and Mechanism of Oxygen Evolution at Ti/RuO2+TiO2 Anodes in Acid Solutions

Jin Shi-Xiong; Wang Lan   

  1. Department of Chemistry, Nankai University
  • Received:1988-09-20 Revised:1989-01-20 Published:1990-04-15
  • Contact: Jin Shi-Xiong

Abstract: The kinetics of anodic O_2 evolution on Ti/RuO_2+TiO_2 anodes was studied in acid solutions, by with two Tafel regions have been confirmed. At low current densities i.e. the first Tafel region ?φ/lgi=2.303RT/((1+β)F, whereas at high cds i. e. second Tafel region it is 2.303RT/βF. In the low current densities region, the reaction order with respect to α_w is 4. For the second Tafel region the reaction order is 2.
The kinetic data obtained show that the rate determining step of the anodic evo-lution of oxygen on Ti/RuO_2+TiO_2 anodes in acid solutions is