INFLUENCE OF PERFLUORINATED AND HYDROGENATED SURFACTANTS UPON HYDROGEN EVOLUTION ON GOLD ELECTRODES

被引：23
作者：
CACHET, C
KEDDAM, M
MARIOTTE, V
WIART, R
机构：
[1] UPR15 du CNRS, Physique des Liquides et Electrochimie, Université Pierre et Marie Curie, 75252 Paris Cedex 05, Tour 22
来源：
ELECTROCHIMICA ACTA | 1994年 / 39卷 / 18期
关键词：
HYDROGEN EVOLUTION; SURFACTANT; IMPEDANCE; OHMIC DROP; INHIBITION;
D O I：
10.1016/0013-4686(94)E0188-6
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The influence of perfluorinated and hydrogenated surfactants on the mechanism of hydrogen evolution on gold electrodes in 1 M H2SO4 has been investigated from steady-state polarization curves and impedance data. The ohmic drop due to bubbles and the reaction inhibition, consequent on both the electrode surface masking by bubbles and the surfactant adsorption, have been separated and compared. The activity of surfactants decreases with the hydrophilic head in the order cationic > anionic > nonionic. Perfluorinated surfactants produce a lower inhibition than the hydrogenated ones on the electrochemical reaction which occurs in a Tafel kinetic regime, independently of the presence of surfactants.
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页码：2743 / 2750
页数：8
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