Electrochemical dissolution of CrIII and CrIV oxides

被引：21

作者：

Grygar, T ^{[1
]}

Bezdicka, P ^{[1
]}

机构：

[1] Acad Sci, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 1998年 / 3卷 / 01期

关键词：

voltammetry; Cr oxides; dissolution; formal charge transfer coefficient;

D O I：

10.1007/s100080050127

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Oxidative dissolution of Cr oxides can be easily performed using voltammetry of immobilised microparticles. A combined procedure based on the dependence of current on time and potential (chronoamperometry with potential jumps) is suitable for the determination of the sensitivity of the dissolution rate to electrochemical potential. Applying this procedure, it was found that the rate determining step is preceded by two-electron oxidation in the solid phase that probably proceeds as a reversible equilibration between surface sites of Cr-III, Cr-IV and Cr-V. Voltammetry is sensitive to the phase composition, and so the voltammetric peak potentials obtained under the same conditions increase in the order LaCrO3 < CrO2 < (MeCr2O4)-Cr-II < alpha-Cr2O3. The influence of Fe- and Ni-for-Fe substitution on dissolution reactivity is also discussed.

引用

页码：31 / 38

页数：8

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