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?/?lgi=2.303RT/(1+β)F(即0.039V,其中β=0.5).高极化区为?/?lg i=2.303RT/βF(即0.118V).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)
The kinetics of anodic O_2 evolution on Ti/RuO_2+TiO_2 anodes was studied in acidsolutions, by with two Tafel regions have been confirmed. At low current densities i.e. the first Tafel region ?ψ/lgi=2.303RT/((1+β)F, whereas at high cds i. e. secondTafel region it is 2.303RT/βF. In the low current densities region, the reactionorder 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
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1990年第2期134-138,共5页
Acta Physico-Chimica Sinica
