ELECTROCHEMICAL-BEHAVIOR OF THE PASSIVE TIN ELECTRODE IN H2SO4 SOLUTIONS AT VERY POSITIVE POTENTIALS

被引：18

作者：

BOJINOV, M ^{[1
]}

SALMI, K ^{[1
]}

SUNDHOLM, G ^{[1
]}

机构：

[1] HELSINKI UNIV TECHNOL, DEPT PHYS CHEM & ELECTROCHEM, SF-02150 ESPOO, FINLAND

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1993年 / 358卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(93)80437-M

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The passive state of the tin electrode in concentrated H2SO4 solutions was studied using electrochemical and photoelectrochemical measurements, photocurrent spectroscopy and impedance spectroscopy. At high anodic overpotentials ( > 0.6 V vs. Hg/Hg2SO4/K2SO4 (sat.)) the passivating layer becomes photoactive. This phenomenon is believed to be due to the formation of a high valency tin oxide. Experimental impedance spectra are compared with simulated spectra using a physical model of the interface based on the so-called surface charge approach. This model describes the growth of a barrier film under kinetic and high-field-assisted migration limitations, as well as its dissolution at the film-solution interface.

引用

页码：177 / 191

页数：15

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