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Characterization of Pr1−xSrxCo0.8Fe0.2O3−δ (0.2 ≤ x ≤ 0.6) cathode materials for intermediate-temperature solid oxide fuel cells

✍ Scribed by Xiangwei Meng; Shiquan Lü; Yuan Ji; Tao Wei; Yanlei Zhang

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
592 KB
Volume
183
Category
Article
ISSN
0378-7753

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✦ Synopsis

Cathode materials consisting of Pr 1-x Sr x Co 0.8 Fe 0.2 O 3-ı (x = 0.2-0.6) were prepared by the sol-gel process for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The samples had an orthorhombic perovskite structure. The electrical conductivities were all higher than 279 S cm -1 . The highest conductivity, 1040 S cm -1 , was found at 300 • C for the composition x = 0.4. Symmetrical cathodes made of Pr 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-ı (PSCF)-Ce 0.85 Gd 0.15 O 1.925 (50:50 by weight) composite powders were screenprinted on GDC electrolyte pellets. The area specific resistance value for the PSCF-GDC cathode was as low as 0.046 cm 2 at 800 • C. The maximum power densities of a cell using the PSCF-GDC cathode were 520 mW cm -2 , 435 mW cm -2 and 303 mW cm -2 at 800 • C, 750 • C and 700 • C, respectively.

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