A high-performance cathode for the next generation of solid-oxide fuel cells

被引:2862
作者
Shao, ZP [1 ]
Haile, SM [1 ]
机构
[1] CALTECH, Pasadena, CA 91125 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature02863
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Fuel cells directly and efficiently convert chemical energy to electrical energy(1). Of the various fuel cell types, solid-oxide fuel cells (SOFCs) combine the benefits of environmentally benign power generation with fuel flexibility. However, the necessity for high operating temperatures (800-1,000 degreesC) has resulted in high costs and materials compatibility challenges(2). As a consequence, significant effort has been devoted to the development of intermediate-temperature (500-700 degreesC) SOFCs. A key obstacle to reduced-temperature operation of SOFCs is the poor activity of traditional cathode materials for electrochemical reduction of oxygen in this temperature regime(2). Here we present Ba0.5Sr0.5Co0.8Fe0.2O3-delta(BSCF) as a new cathode material for reduced-temperature SOFC operation. BSCF, incorporated into a thin-film doped ceria fuel cell, exhibits high power densities (1,010 mW cm(-2) and 402 mW cm(-2) at 600 degreesC and 500 degreesC, respectively) when operated with humidified hydrogen as the fuel and air as the cathode gas. We further demonstrate that BSCF is ideally suited to 'single-chamber' fuel-cell operation, where anode and cathode reactions take place within the same physical chamber(3). The high power output of BSCF cathodes results from the high rate of oxygen diffusion through the material. By enabling operation at reduced temperatures, BSCF cathodes may result in widespread practical implementation of SOFCs.
引用
收藏
页码:170 / 173
页数:4
相关论文
共 18 条
[1]   Recent advances in materials for fuel cells [J].
Brandon, NP ;
Skinner, S ;
Steele, BCH .
ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :183-213
[2]   Solid oxide fuel cell cathodes: Polarization mechanisms and modeling of the electrochemical performance [J].
Fleig, J .
ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :361-382
[3]   Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode [J].
Fukunaga, H ;
Koyama, M ;
Takahashi, N ;
Wen, C ;
Yamada, K .
SOLID STATE IONICS, 2000, 132 (3-4) :279-285
[4]   A low-operating-temperature solid oxide fuel cell in hydrocarbon-air mixtures [J].
Hibino, T ;
Hashimoto, A ;
Inoue, T ;
Tokuno, J ;
Yoshida, S ;
Sano, M .
SCIENCE, 2000, 288 (5473) :2031-2033
[5]   Increasing power density of LSGM-based solid oxide fuel cells using new anode materials [J].
Huang, KQ ;
Wan, JH ;
Goodenough, JB .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2001, 148 (07) :A788-A794
[6]   La-doped BaCoO3 as a cathode for intermediate temperature solid oxide fuel cells using a LaGaO3 base electrolyte [J].
Ishihara, T ;
Fukui, S ;
Nishiguchi, H ;
Takita, Y .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (07) :A823-A828
[7]   Diffusion and surface exchange coefficients in mixed ionic electronic conducting oxides from the pressure dependence of oxygen permeation [J].
Kim, S ;
Yang, YL ;
Jacobson, AJ ;
Abeles, B .
SOLID STATE IONICS, 1998, 106 (3-4) :189-195
[8]   Cathode materials for reduced-temperature SOFCs [J].
Ralph, JM ;
Rossignol, C ;
Kumar, R .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (11) :A1518-A1522
[9]   Performance of a mixed-conducting ceramic membrane reactor with high oxygen permeability for methane conversion [J].
Shao, ZP ;
Dong, H ;
Xiong, GX ;
Gong, Y ;
Yang, WS .
JOURNAL OF MEMBRANE SCIENCE, 2001, 183 (02) :181-192
[10]   Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3-δ oxygen membrane [J].
Shao, ZP ;
Yang, WS ;
Cong, Y ;
Dong, H ;
Tong, JH ;
Xiong, GX .
JOURNAL OF MEMBRANE SCIENCE, 2000, 172 (1-2) :177-188