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
- 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, Vol. 42, Issue 8; Other Information: DOI: 10.1016/j.materresbull.2006.11.004; PII: S0025-5408(06)00437-5; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of Ln{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Mn{sub 0.2}O{sub 3-{delta}} (Ln=La, Gd, Sm or Nd) as the cathode materials for intermediate temperature SOFC
Crystal structure and electrical conductivity of lanthanum-calcium chromites-titanates La{sub 1-x}Ca{sub x}Cr{sub 1-y}Ti{sub y}O{sub 3-{delta}} (x=0-1, y=0-1)