CHRONOCOULOMETRIC MEASUREMENTS OF CAPACITIVE CHARGE IN THE PRESENCE OF FARADAIC CONTRIBUTIONS

被引：18

作者：

FORESTI, ML ^{[1
]}

PEZZATINI, G ^{[1
]}

MONTEAGUDO, JCG ^{[1
]}

机构：

[1] UNIV SANTIAGO DE COMPOSTELA,DEPT FISICOQUIM APL,SANTIAGO,SPAIN

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1990年 / 295卷 / 1-2期

关键词：

Electrodes;

D O I：

10.1016/0022-0728(90)85020-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An improvement over the Chronocoulometric method for measuring absolute values of capacitive charge as described by Foresti et al. (J. Electroanal. Chem., 109 (1980) 15) is reported and applied to a Hg dropping electrode immersed in aqueous NaF. A double-potential-step and a single-potential-step chronocoulometric procedure for correcting capacitive charge measurements for large faradaic contributions are described. Applications to capacitive charge measurements at a dropping Ga electrode immersed in a pH 3.5 solution of 0.5 M (Na2SO4 + H2SO4 are reported, in which the faradaic charge due to hydrogen evolution is corrected for. Progressive additions of aliphatic alcohols to a neutral solution of 0.5 M Na2SO4 are shown to determine the formation of a submonolayer of Ga oxides at increasingly positive potentials. © 1990.

引用

页码：251 / 264

页数：14

共 12 条

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