TITLE

Composite cathode based on yttria stabilized bismuth oxide for low-temperature solid oxide fuel cells

AUTHOR(S)
Xia, Changrong; Zhang, Yuelan; Liu, Meilin
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Composites consisting of silver and yttria stabilized bismuth oxide (YSB) have been investigated as cathodes for low-temperature honeycomb solid oxide fuel cells with stabilized zirconia as electrolytes. At 600 °C, the interfacial polarization resistances of a porous YSB-Ag cathode is about 0.3 Ω cm², more than one order of magnitude smaller than those of other reported cathodes on stabilized zirconia. For example, the interfacial resistances of a traditional YSZ-lanthanum maganites composite cathode is about 11.4 Ω cm² at 600 ° C. Impedance analysis indicated that the performance of an YSB-Ag composite cathode fired at 850 °C for 2 h is severely limited by gas transport due to insufficient porosity. The high performance of the YSB-Ag cathodes is very encouraging for developing honeycomb fuel cells to be operated at temperatures below 600 °C.
ACCESSION #
9036501

 

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