SURFACE BLOCKING IN THE REDOX SYSTEM PT/[FE(CN)6]3-,[FE(CN)6]4- - AN AC IMPEDANCE STUDY

被引：26
|
作者：
STIEBLE, M
JUTTNER, K
机构：
[1] Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, D-7500 Karlsruhe 1
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1990年 / 290卷 / 1-2期
关键词：
Cyanides--Redox - Electric Impedance--Spectrum Analysis - Electrolytes--Cyanides - Iron Compounds--Cyanides - Mathematical Techniques--Transfer Functions;
D O I：
10.1016/0022-0728(90)87428-M
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Electrochemical dc and ac measurements were made in the system Pt/x M [Fe(CN)6]3-, [Fe(CN)6]4- +0.5 M Na2SO4 in the range 2×10-6 ≤ x ≤ 2×10-2 at T = 298 K and pH 6 using the rotating disk technique. Depending on the defined prepolarization conditions, a partial blocking of the electrode surface was observed indicated by distinct changes of the impedance spectra. Transfer function analysis based on a model of a transport controlled reaction on a partially blocked surface gave quantitative information on the degree of surface coverage. Systematic variation of the experimental conditions allowed conclusions to be drawn about the chemical nature of the blocking species. © 1990.
引用
收藏
页码：163 / 180
页数：18
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