Novel composite interconnecting ceramics La{sub 0.7}Ca{sub 0.3}CrO{sub 3-{delta}}/Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} for solid oxide fuel cells

Journal Article · Tue Aug 07 04:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.11.004· OSTI ID:21000696

Xiaoliang, Zhou ^[1]; Feijun, Deng ^[1]; Mingxing, Zhu ^[1]; Guangyao, Meng ^[1]; Xingqin, Liu ^[1]

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1. Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China)

In this paper, an interconnecting ceramic for solid oxide fuel cells was developed, based on the modification from La{sub 0.7}Ca{sub 0.3}CrO{sub 3-{delta}} by addition of Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9}. It is found that addition of small amount Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} into La{sub 0.7}Ca{sub 0.3}CrO{sub 3-{delta}} dramatically increased the electrical conductivity. For the best system, La{sub 0.7}Ca{sub 0.3}CrO{sub 3-{delta}} + 5 wt.% Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9}, the electrical conductivity reached 687.8 S cm{sup -1} at 800 deg. C in air. In H{sub 2} at 800 deg. C, the specimen with 3 wt.% Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} had the maximal electrical conductivity of 7.1 S cm{sup -1}. With the increase of Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} content the relative density increased, reaching 98.7% when the Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} content was 10 wt.%. The average coefficient of thermal expansion at 30-1000 deg. C in air increased with Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} content, ranging from 11.12 x 10{sup -6} to 12.46 x 10{sup -6} K{sup -1}. The oxygen permeation measurement illustrated a negligible oxygen ionic conduction, indicating it is still an electronically conducting ceramic. Therefore, this material system will be a very promising interconnect for solid oxide fuel cells.

• OSTI ID: 21000696
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 8 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
CALCIUM OXIDES
CERAMICS
CHROMIUM OXIDES
ELECTRIC CONDUCTIVITY
LANTHANUM OXIDES
POTASSIUM IONS
SAMARIUM OXIDES
SOLID OXIDE FUEL CELLS
THERMAL EXPANSION
X-RAY DIFFRACTION