物理化学学报 >> 1990, Vol. 6 >> Issue (02): 134-138.doi: 10.3866/PKU.WHXB19900203

研究论文 上一篇    下一篇

酸溶液中氧在Ti/RuO2+TiO2电极上阳极析出动力学与机理研究

金世雄; 王岚   

  1. 南开大学化学系
  • 收稿日期:1988-09-20 修回日期:1989-01-20 发布日期:1990-04-15
  • 通讯作者: 金世雄

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

PDF

2525

赞

摘要： 本文通过在酸溶液中Ti/RuO_2+TiO_2电极上氧阳极析出动力学的研究, 表明酸溶液中氧阳极析出的极化曲线同样具有两Tafel区. 低极化区的Tafel斜率? φ/?lgi=2.303RT/(1+β)F(即0.039 V, 其中β=0.5). 高极化区为?φ/?lg i=2.303RT/βF(即0.118 V). 在前一区域内氧析出反应对于水分子活度(α_w)的反应级数为4, 即i～α_w~4. 后一区域内则为2, 即i～α_w~2. 实验结果表明, 酸溶液中上述电极上氧阳极析出是按反应序列(1)、(2)进行的

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
...