Electronic Conduction of Yttria-Stabilized Zirconia Electrolyte in Solid Oxide Cells Operated in High Temperature Water Electrolysis

被引:78
作者
Schefold, J. [1 ]
Brisse, A. [1 ]
Zahid, M. [1 ]
机构
[1] European Inst Energy Res, D-76131 Karlsruhe, Germany
关键词
electrolysis; ionic conductivity; solid electrolytes; solid oxide fuel cells; yttrium compounds; zirconium compounds; HYDROGEN-PRODUCTION; BEHAVIOR; STEAM; PERFORMANCE;
D O I
10.1149/1.3138701
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Anode-supported solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolytes, both commercial and research, are used at 800-900 degrees C as solid oxide H2O electrolyzer cells (SOECs). When the operation is extended to current densities j corresponding to a steam-conversion rate above 100%, or when the steam supply is interrupted under constant current conditions, cell voltages saturate at similar to 1.9 V at 810 degrees C. A cell survives 64 h polarization at j=-0.34 A cm(-2) without any steam supply. The mechanism limiting the cell voltage is attributed to electronic conduction in the YSZ electrolyte. No indications are found for electrolyte decomposition. Because the saturation voltage exceeds typical operation voltages by several hundred millivolts, electrolyte conduction in the normal SOEC mode remains predominantly ionic. The rise in the cell voltage to the value determined by electronic conduction occurs when steam transport in the hydrogen/steam electrode becomes limiting. As a consequence of H2O back-diffusion from the cell exhaust in the used unsealed test configuration, the rise occurs at nonzero current density under zero steam supply. Impedance spectroscopic data are compared with and without steam supply and are qualitatively interpreted with an equivalent circuit model.
引用
收藏
页码:B897 / B904
页数:8
相关论文
共 44 条
[1]  
[Anonymous], 2002, SEMICONDUCTOR DEVICE
[2]   HIGH-TEMPERATURE WATER ELECTROLYSIS - CATHODIC BEHAVIOR OF PT/YTTRIA STABILIZED ZIRCONIA (YSZ) INTERFACE [J].
BARBI, GB ;
MARI, CM .
SOLID STATE IONICS, 1982, 6 (04) :341-351
[3]   Detailed characterization of anode-supported SOFCs by impedance spectroscopy [J].
Barfod, Rasmus ;
Mogensen, Mogens ;
Klemenso, Trine ;
Hagen, Anke ;
Liu, Yi-Lin ;
Hendriksen, Peter Vang .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2007, 154 (04) :B371-B378
[4]  
Bossel U., 2008, P 8 LUC FUEL CELL FO, pA1101
[5]   High temperature water electrolysis in solid oxide cells [J].
Brisse, Annabelle ;
Schefold, Josef ;
Zahid, Mohsine .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2008, 33 (20) :5375-5382
[6]   An electrolyte model for ceramic oxygen generator and solid oxide fuel cell [J].
Chan, SH ;
Chen, XJ ;
Khor, KA .
JOURNAL OF POWER SOURCES, 2002, 111 (02) :320-328
[7]   Influence of microstructure on the ionic conductivity of yttria-stabilized zirconia electrolyte [J].
Chen, XJ ;
Khor, KA ;
Chan, SH ;
Yu, LG .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 335 (1-2) :246-252
[8]  
Dicks A, 2003, FUEL CELL SYSTEMS EX, P428
[9]   HYDROGEN-PRODUCTION BY HIGH-TEMPERATURE ELECTROLYSIS OF WATER-VAPOR [J].
DOENITZ, W ;
SCHMIDBERGER, R ;
STEINHEIL, E ;
STREICHER, R .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1980, 5 (01) :55-63
[10]   Power generation and steam electrolysis characteristics of an electrochemical cell with a zirconia- or ceria-based electrolyte [J].
Eguchi, K ;
Hatagishi, T ;
Arai, H .
SOLID STATE IONICS, 1996, 86-8 :1245-1249