Discovery of the rate limiting step in solid oxide fuel cells by LEIS

被引:18
作者
de Ridder, M
van Welzenis, RG
Brongersma, HH
Wulff, S
Chu, WF
Weppner, W
机构
[1] Eindhoven Univ Technol, Fac Appl Phys, NL-5600 MB Eindhoven, Netherlands
[2] Univ Kiel, D-24143 Kiel, Germany
关键词
yttria stabilized zirconia; low-energy ion scattering; segregation; impurity; free energy; solid oxide fuel cell;
D O I
10.1016/S0168-583X(01)01268-X
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The outermost surface of the yttria stabilised zirconia (YSZ) electrolyte in the solid oxide fuel cell (SOFC) plays a dominant role in the performance of the cell. Low energy ion scattering is the only technique, which is capable of studying exactly that surface. Instead of Y2O3, impurities segregated to the outermost surface until it was completely covered by them. This strong impurity segregation was proven characteristic for any YSZ sample. The performance of the SOFC will therefore be completely determined by these impurities. Y2O3 did segregate to the subsurface layer and a difference in interfacial free energies between Y2O3 and ZrO2 of 21 +/- 3 kJ/mol was determined. So what normally is explained Lis surface segregation is in fact subsurface segregation, which also explains the higher Y2O3, concentration measured in this study compared to literature. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:732 / 735
页数:4
相关论文
共 11 条
[1]  
BADWAL SPS, 1988, MATER SCI FORUM, V34, P195
[2]  
Brongersma H H, 1978, Rev Sci Instrum, V49, P707, DOI 10.1063/1.1135598
[3]   AUTOMATIC-ANALYSIS OF ISS - SPECTRA [J].
CREEMERS, C ;
ROYER, D ;
SCHRYVERS, P .
SURFACE AND INTERFACE ANALYSIS, 1993, 20 (03) :233-242
[4]  
DERIDDER M, IN PRESS SURF INTERF
[5]  
DERIDDER M, IN PRESS
[6]   SEGREGATION IN SINGLE-CRYSTAL FULLY STABILIZED YTTRIA-ZIRCONIA [J].
HUGHES, AE .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1995, 78 (02) :369-378
[7]   IMPURITY SEGREGATION STUDY AT THE SURFACE OF YTTRIA-ZIRCONIA ELECTROLYTES BY XPS [J].
HUGHES, AE ;
BADWAL, SPS .
SOLID STATE IONICS, 1990, 40-1 :312-315
[8]   SEGREGATION ASPECTS AT THE FRACTURE SURFACES OF 8 WT-PERCENT YTTRIA-ZIRCONIA THERMAL BARRIER COATINGS [J].
INGO, GM ;
PADELETTI, G .
SURFACE AND INTERFACE ANALYSIS, 1994, 21 (6-7) :450-+
[9]   SURFACE COMPOSITION OF BINARY-SYSTEMS - PREDICTION OF SURFACE PHASE-DIAGRAMS OF SOLID-SOLUTIONS [J].
OVERBURY, SH ;
BERTRAND, PA ;
SOMORJAI, GA .
CHEMICAL REVIEWS, 1975, 75 (05) :547-560
[10]   SEGREGATION ASPECTS IN THE ZRO2-Y2O3 CERAMIC SYSTEM [J].
THEUNISSEN, GSAM ;
WINNUBST, AJA ;
BURGGRAAF, AJ .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1989, 8 (01) :55-57