Preparation of perovskite-type La1-xSrxMnO3 films by vapor-phase processes and their electrochemical properties -: II.: Effects of doping strontium to LaMnO3 on the electrode properties

被引：45

作者：

Ioroi, T ^{[1
]}

Hara, T ^{[1
]}

Uchimoto, Y ^{[1
]}

Ogumi, Z ^{[1
]}

Takehara, Z ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Kyoto 606, Japan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1998年 / 145卷 / 06期

关键词：

D O I：

10.1149/1.1838589

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Complex alternating current impedance and steady-state polarization measurements have been conducted on dense and thin LaMnO3 and La0.85Sr0.15MnO3 film electrodes and porous-sintered LaMnO3 and La0.85Sr0.15MnO3 electrodes in air at elevated temperatures between 873 and 1273 K, in order to study the reaction mechanism of oxygen reduction at the La1-xSrxMnO3 electrode of a solid oxide fuel cell. By fitting impedance spectra to an appropriate equivalent circuit, the chemical diffusion coefficient of oxygen and interfacial reaction resistance of the LaMnO3 and La0.85Sr0.15MnO3 film electrodes were determined. The chemical diffusion coefficient was scarcely affected by Sr doping, while the interfacial reaction resistance considerably decreased by Sr doping. Steady-state polarization behavior of the porous-sintered La1-xSrxMnO3 was dramatically improved by doping Sr, while those of the dense La1-xSrxMnO3 film were almost unchanged by Sr doping. These results suggested that the electrochemical reduction of oxygen at the porous La1-xSrxMnO3 electrode takes place around the triple phase boundary (TPB), and the reaction rate is controlled by the surface reactions close to the triple phase boundary region.

引用

页码：1999 / 2004

页数：6

共 30 条

[1] OXYGEN CHEMICAL DIFFUSION IN STRONTIUM DOPED LANTHANUM MANGANITES [J].

BELZNER, A ;

GUR, TM ;

HUGGINS, RA .

SOLID STATE IONICS, 1992, 57 (3-4) :327-337

[2] A NONLINEAR LEAST-SQUARES FIT PROCEDURE FOR ANALYSIS OF IMMITTANCE DATA OF ELECTROCHEMICAL SYSTEMS [J].

BOUKAMP, BA .

SOLID STATE IONICS, 1986, 20 (01) :31-44

[3]

Crank J, 1979, MATH DIFFUSION

[4] OXYGEN REDUCTION AT LA0.5SR0.5MNO3 THIN-FILM YTTRIA-STABILIZED ZIRCONIA INTERFACE STUDIED BY IMPEDANCE SPECTROSCOPY [J].

GHARBAGE, B ;

PAGNIER, T ;

HAMMOU, A .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (08) :2118-2121

[5] SURFACE CHARACTERIZATION AND CATALYTIC PROPERTIES OF LA(1-X)A(X)MO(3) PEROVSKITE OXIDES .2. STUDIES ON LA1-XBAXMNO3 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.2) OXIDES [J].

GUNASEKARAN, N ;

RAJADURAI, S ;

CARBERRY, JJ ;

BAKSHI, N ;

ALCOCK, CB .

SOLID STATE IONICS, 1995, 81 (3-4) :243-249

[6] ELECTROCATALYTIC PROPERTIES AND NONSTOICHIOMETRY OF THE HIGH-TEMPERATURE AIR ELECTRODE LA1-XSRXMNO3 [J].

HAMMOUCHE, A ;

SIEBERT, E ;

HAMMOU, A ;

KLEITZ, M ;

CANEIRO, A .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1991, 138 (05) :1212-1216

[7]

HERLE JV, 1996, ELECTROCHIM ACTA, V41, P1447

[8]

HERLE JV, 1994, ELECTROCHIM ACTA, V39, P1675

[9] Preparation and characteristics of LaMnO3 thin film electrode on YSZ by a vapor-phase process [J].

Ioroi, T ;

Ogumi, Z ;

Takehara, Z ;

Uchimoto, Y .

CHEMISTRY LETTERS, 1996, (11) :949-950

[10] Preparation of perovskite-type La1-xSrxMnO3 films by vapor-phase processes and their electrochemical properties [J].

Ioroi, T ;

Hara, T ;

Uchimoto, Y ;

Ogumi, Z ;

Takehara, Z .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (04) :1362-1370

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