ELECTROCHEMICAL STUDY OF THE PROPERTIES OF IRON IONS IN ZNCL2+2NACL MELT AT 450-DEGREES-C

被引：36

作者：

CASTRILLEJO, Y ^{[1
]}

MARTINEZ, AM ^{[1
]}

VEGA, M ^{[1
]}

BARRADO, E ^{[1
]}

PICARD, G ^{[1
]}

机构：

[1] ECOLE NATL SUPER CHIM,ELECTROCHIM ANALYT & APPL LAB,F-75231 PARIS 05,FRANCE

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1995年 / 397卷 / 1-2期

关键词：

MOLTEN SALTS; FE(II); GLOSSY CARBON ELECTRODE;

D O I：

10.1016/0022-0728(95)04151-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The electrochemical properties of Fe(II) in the ZnCl2 + 2NaCl melt at 450 degrees C have been studied using a glassy carbon electrode. Iron oxidation states II and III have been shown to exist in the mixture and the stability of metallic iron has been confirmed. The kinetics of the electrodeposition and electrocrystallization of iron were studied finding that the process is quasi-reversible. In the same way, the Fe(III)/Fe(II) exchange was found to be quasi-reversible. The values of the kinetic parameters, k(o) and alpha for both reactions were obtained. Mass transport towards the electrode is a simple diffusion process. The diffusion coefficient was found (1.3 +/- 0.4) X 10(-5) cm(2) s(-1). Potential step measurements indicate instantaneous nucleation and growth of iron (I against t(1/2)) followed by diffusion control (Cottrell equation).

引用

页码：139 / 147

页数：9

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