APPLICATION OF THE AC ADMITTANCE TECHNIQUE TO DOUBLE-LAYER STUDIES ON POLYCRYSTALLINE GOLD ELECTRODES

被引:109
作者
FAWCETT, WR
KOVACOVA, Z
MOTHEO, AJ
FOSS, CA
机构
[1] Department of Chemistry, University of California, Davis
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1992年 / 326卷 / 1-2期
关键词
D O I
10.1016/0022-0728(92)80505-X
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A detailed examination of the dependence of the ac admittance of a cell containing a polycrystalline gold electrode has been made in the double-layer region as a function of dc potential, ac frequency and electrode history. It is shown that the interfacial impedance of a gold electrode with a carefully prepared surface can be treated under these circumstances as a constant phase element when it is in contact with an aqueous solution containing 0.05 M KClO4. Analysis of the frequency dependence of the cell impedance gives the surface inhomogeneity parameter n which turns out to be very close to unity. Although the electrode surface is only slightly inhomogeneous on a microscopic scale, a very large frequency dispersion of the impedance is observed experimentally. A method of estimating the true specific capacity of the electrode is presented, and conditions for carrying out the experiments in a reproducible manner are discussed.
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收藏
页码:91 / 103
页数:13
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