OXIDE ELECTRODES IN MOLTEN CARBONATES .2. ELECTROCHEMICAL-BEHAVIOR OF COBALT IN MOLTEN LI+K AND NA+K CARBONATE EUTECTICS

被引：16

作者：

TOMCZYK, P ^{[1
]}

SATO, H ^{[1
]}

YAMADA, K ^{[1
]}

NISHINA, T ^{[1
]}

UCHIDA, I ^{[1
]}

机构：

[1] TOHOKU UNIV,FAC ENGN,DEPT APPL CHEM,SENDAI,MIYAGI 980,JAPAN

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1995年 / 391卷 / 1-2期

关键词：

COBALT OXIDATION; MOLTEN CARBONATES; OXYGEN REDUCTION;

D O I：

10.1016/0022-0728(95)03943-B

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Spontaneous electrochemical processes occurring on Co and CoO in molten Li + K and Na + K carbonate eutectics saturated with a 0.9 O-2 + 0.1 CO2 atmosphere were investigated at 1000 K. It was shown that oxidation of Co to CoO proceeds via formation of an unstable compound in Li2CO3 + K2CO3. There is no indication that such a compound is formed in Na2CO3 + K2CO3. CoO undergoes further oxidation in molten carbonates producing LiCoO2 in Li2CO3 + K2CO3 and NaCoO2 (presumably) in Na2CO3 + K2CO3. The oxidation processes increase the active area of the electrode as indicated by the measurements of exchange current densities, double-layer capacitances and impedances of electrodes.

引用

页码：133 / 139

页数：7

共 24 条

[1] REDUCTION OF OXYGEN IN ALKALI CARBONATE MELTS [J].

APPLEBY, AJ ;

NICHOLSON, SB .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1977, 83 (02) :309-328

[2]

BARD AJ, 1980, ELECTROCHEMICAL METH, P519

[3]

Barin I., 1989, THERMOCHEMICAL DATA, Vthird

[4] SOLUBILITIES OF LIFEO2 AND (LI, K)2CRO4 IN MOLTEN ALKALI CARBONATES AT 650-DEGREES-C [J].

HSU, HS ;

DEVAN, JH ;

HOWELL, M .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1987, 134 (09) :2146-2150

[5] THE STATE OF MCFC TECHNOLOGY DEVELOPMENT [J].

KISHIDA, K .

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1990, 94 (09) :941-946

[6]

KONOSHITA K, 1988, FUEL CELL HDB, P57

[7]

MAKKUS RC, 1991, THESIS TU DELFT

[8]

MEHANDJIEV D, 1969, COMPT REND ACAD BULG, V22, P1253

[9] MODIFICATION IN THE ELECTRONIC-STRUCTURE OF COBALT BRONZE LIXCOO2 AND THE RESULTING ELECTROCHEMICAL PROPERTIES [J].

MOLENDA, J ;

STOKLOSA, A ;

BAK, T .

SOLID STATE IONICS, 1989, 36 (1-2) :53-58

[10] ELECTROCHEMICAL CHARACTERIZATION OF THE O2-/O2(2-) SYSTEM IN MOLTEN NA2CO3+K2CO3 EUTECTIC AT 750-DEGREES-C [J].

MOUTIERS, G ;

CASSIR, M ;

DEVYNCK, J .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1991, 315 (1-2) :103-112

← 1 2 3 →