全氟表面活性剂对电极反应的影响─—非离子型全氟表面活性剂与碳氢链表面活性剂的比较

Effects of Perfluorinated Surfactants on Electrode Reaction──Comparation of Non-lonic Perfluorinated and Hydrogenated Surfactants

研究了非离子型全氟表面活性剂在汞电极表面的吸附行为及对若干典型电还原反应的影响，并与相应的碳氢链表面活性剂作了比较。结果表明，在零电荷电位附近，两类表面活性剂均以憎水链吸附于电极表面，由于全氟链的吸附活性弱于碳氢链，其对电极表面的屏蔽作用及对电极反应的阻碍均较弱。在负极化区，憎水链脱附，亲水基团吸附于电极表面，这时两类表面活性剂对电极反应的阻碍作用一般相差不大。

The adsorption behaviors of non-ionic perfluorinated and hydrogenated surfactants at Hg electrode surface, and their influences on several electrode processes were studied. It was shown that the hydrophobic chains were adsorbed directly at the electrode surface in the potential region near PZC, and the adsorption activity as well as the screening and inhibiting effeects on the kinetics of electrode processes of the perfluorinated alkyl group were weaker than that of hydrogenated alkyl group. However, in the potential region in which the electrode was negatively charged, the two sorts of surfactant molecules were adsorbed with their hydrophilic chains oriented to the electrode surface, and exhibit similar effects on electrode processes.