Anodic behavior of carbon electrodes in CaO-CaCl2 melts at 1123 K

被引：44

作者：

Mohamedi, M ^{[1
]}

Borresen, B ^{[1
]}

Haarberg, GM ^{[1
]}

Tunold, R ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Electrochem, N-7034 Trondheim, Norway

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1999年 / 146卷 / 04期

关键词：

D O I：

10.1149/1.1391789

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The anodic process on glassy carbon electrodes in molten CaCl2 containing CaO was investigated at 1123 K by cyclic voltammetry and convolution voltammetry. It was found that the oxidation sequence occurs through a consecutive two-step electrochemical reaction: O2-(diss) + xC --> CxO(ads) + 2e and O2-(diss) + CxO(ads) --> CO2(gas) + (x - 1)C + 2e. Both steps were found to be irreversible. Experimental data indicate that the first electrochemical step is preceded by the dissociation of a complex. The diffusion coefficient of the oxygen-containing species, the charge-transfer coefficient, and the charge-transfer rate constant were found equal to 2.0 x 10(-6) cm(2) s(-1), 0.43, and 1.8 x 10(-5) cm s(-1), respectively. (C) 1999 The Electrochemical Society. S0013-4651(98)06-045-5. All rights reserved.

引用

页码：1472 / 1477

页数：6

共 32 条

[1]

AMAR F, 1973, J ELECTROANAL CHEM, V47, P215

[2]

BARBIN NM, 1993, ELECTROCHEMICAL SOC, P562

[3] Diagnosis of adsorption on solid electrodes using semi-integral voltammetry: A generalization via asymptotic analysis [J].

Bernard, MO ;

Bureau, C ;

Soudan, JM ;

Lecayon, G .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 431 (02) :153-162

[4] OXIDE COMPLEXES IN ALKALI ALKALINE-EARTH CHLORIDE MELTS [J].

BOGHOSIAN, S ;

GODO, A ;

MEDIAAS, H ;

RAVLO, W ;

OSTVOLD, T .

ACTA CHEMICA SCANDINAVICA, 1991, 45 (02) :145-157

[5] DIAGNOSIS OF ADSORPTION ON SOLID ELECTRODES WITH SEMI-INTEGRAL VOLTAMMETRY [J].

BOWLING, R ;

MCCREERY, RL .

ANALYTICAL CHEMISTRY, 1988, 60 (06) :605-608

[6] ELECTROCHEMICAL BEHAVIOR OF DIFFERENT GRAPHITE-CRYOLITE ALUMINA MELT INTERFACES UNDER POTENTIODYNAMIC PERTURBATIONS [J].

CALANDRA, AJ ;

CASTELLANO, CE ;

FERRO, CM .

ELECTROCHIMICA ACTA, 1979, 24 (04) :425-437

[7] STUDY OF ANODIC REACTIONS OF OXIDE IONS DISSOLVED IN THE LICL-KCL EUTECTIC ON GRAPHITE-ELECTRODES BY ELECTROCHEMICAL IMPULSE METHODS [J].

DAMIANACOS, D .

ELECTROCHIMICA ACTA, 1982, 27 (09) :1297-1305

[8] VOLTAMMETRIC AND CHRONOPOTENTIOMETRIC STUDIES OF NA2O-NACL MELTS [J].

DEANHARDT, ML ;

STERN, KH .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1980, 127 (12) :2600-2602

[9]

DEGUIBERT A, 1979, THESIS PARIS

[10] THEORY OF IRREVERSIBLE WAVES IN OSCILLOGRAPHIC POLAROGRAPHY [J].

DELAHAY, P .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1953, 75 (05) :1190-1196

← 1 2 3 4 →