Transition metal doped LaGaO3 perovskite fast oxide ion conductor and intermediate temperature solid oxide fuel cell

被引:0
作者
Ishihara, T [1 ]
Shibayama, T [1 ]
Honda, M [1 ]
Nishiguchi, H [1 ]
Takita, Y [1 ]
机构
[1] Oita Univ, Fac Engn, Dept Appl Chem, Oita 8701192, Japan
来源
NEW MATERIALS FOR BATTERIES AND FUEL CELLS | 2000年 / 575卷
关键词
D O I
暂无
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Doping transition metal cation is known to enhance the electric conduction of solid electrolytes, however, the ionic conduction can be improved by doping the small amount of transition metal, in particular, doping Co is effective for improving the oxide ion conductivity. In this investigation, oxide ion conductivity of LaGaO3 based oxide doped with Co were investigated in detail. It was found that LaGaO3 doped with Co for Ga site (LSGMC) show a notable oxide ion conductivity over a wide range of oxygen partial pressures, although a hole conduction was appeared by addition of excess amount of Co. Considering the electrical conductivity and transport number of oxide ion, the optimized composition of LSGMC seems to be existed at La0.8Sr0.2Ga0.8Mg0.115Co0.085O3. Power generation characteristics of fuel cells was greatly improved by using LSGMC for electrocyte and extremely large power density can be obtained on both H-2-O-2 and H-2-air cells. In particular, the maximum power density was attained to a value of 1.53 and 0.50 W/cm(2) at 1073 and 873 K, respectively, on H-2-O-2 cell when the thickness of electrolyte was 0.18 mm. Furthermore, almost similar large power density was attained when air was used as oxidant. The high power density of cell demonstrated in this study suggests that the operating temperature of SOFC can be decreased by using LSGMC for electrolyte.
引用
收藏
页码:283 / 294
页数:12
相关论文
共 15 条
[1]   Electrode kinetics of porous mixed-conducting oxygen electrodes [J].
Adler, SB ;
Lane, JA ;
Steele, BCH .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (11) :3554-3564
[2]   Ionic and electronic conduction in Fe and Cr doped (La,Sr)GaO3-delta [J].
Baker, RT ;
Gharbage, B ;
Marques, FMB .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (09) :3130-3135
[3]  
BALACHANDRAN U, 1995, AM CERAM SOC BULL, V74, P71
[4]  
Choudhary C.B., 1980, SOLID ELECTROLYTES T, P40
[5]   Reduced-temperature solid oxide fuel cell based on YSZ thin-film electrolyte [J].
deSouza, S ;
Visco, SJ ;
DeJonghe, LC .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (03) :L35-L37
[6]   Characterisation, conductivity and mechanical properties of the oxygen-ion conductor La0.9Sr0.1Ga0.8Mg0.2O3-x [J].
Drennan, J ;
Zelizko, V ;
Hay, D ;
Ciacchi, FT ;
Rajendran, S ;
Badwal, SPS .
JOURNAL OF MATERIALS CHEMISTRY, 1997, 7 (01) :79-83
[7]  
FENG M, 1994, EUR J SOL STATE INOR, V31, P633
[8]   Sol-gel synthesis of a new oxide-ion conductor Sr- and Mg-doped LaGaO3 perovskite [J].
Huang, KQ ;
Feng, M ;
Goodenough, JB .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1996, 79 (04) :1100-1104
[9]   Superior oxygen ion conductivity of lanthanum gallate doped with strontium and magnesium [J].
Huang, PN ;
Petric, A .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (05) :1644-1648
[10]   DOPED LAGAO3 PEROVSKITE-TYPE OXIDE AS A NEW OXIDE IONIC CONDUCTOR [J].
ISHIHARA, T ;
MATSUDA, H ;
TAKITA, Y .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1994, 116 (09) :3801-3803