Pt-cermet cathode for reduced temperature SOFCs

被引:27
作者
Sasaki, K
Tamura, J
Dokiya, M
机构
[1] Yokohama Natl Univ, Grad Sch Environm & Informat Sci, Yokohama, Kanagawa 2408501, Japan
[2] Tanaka Kikinzoku Kogyo KK, Atsugi, Kanagawa 2430213, Japan
关键词
Pt-Zr(Sc)O-2 cermet cathode; reduced temperature SOFCs; two-dimensional active site; three-dimensional active site; expansion of electrolyte area;
D O I
10.1016/S0167-2738(01)00973-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polarization characteristics of Pt-(Sc0.10Ce0.01)Zr0.89O2 (SSZ) cermet cathodes were studied in order to develop new cathodes for reduced temperature solid oxide fuel cells (SOFCs). Several Pt-SSZ cermet electrodes were prepared by mixing Pt and SSZ powders using a high-energy ball mill. A Pt-SSZ cermet cathode on yttria-stabilized zirconia (YSZ) electrolyte achieved high cathodic activity; the cathode interfacial conductivity reached as high as 6.7 S/cm(2) at 973 K and 0.8 S/cm(2) at 873 K. These results suggest that this Pt-SSZ cermet cathode has enough capability at 973 K, but is still not satisfactory at 873 K. This high activity can be obtained by ball milling SSZ/Pt mixture of proper ratios in vacuum and by controlling electrode thickness, sintering temperature, and Ca impurity. These electrodes showed two optima of interfacial conductivity vs. SSZ/Pt ratio and remarkable dependence on cathode thickness. It was considered that the first optimum is based on two-dimensional reaction sites on YSZ electrolyte surface and the second one originates from three-dimensional expansion of reaction sites into the cermet cathode. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:223 / 232
页数:10
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