Investigation on thermal, electrical, and electrochemical properties of scandium-doped Pr0.6Sr0.4(Co0.2Fe0.8)(1−x)ScxO3−δ as cathode for IT-SOFC
✍ Scribed by Yi-Mei Yin; Ming-Wen Xiong; Nai-Tao Yang; Ze Tong; Ya-Qin Guo; Zi-Feng Ma; Ellen Sun; Jean Yamanis; Bu-Yun Jing
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 910 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0360-3199
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✦ Synopsis
A systematic study and evaluation were performed on the effect of scandium doping at the B site of Pr 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Àd (PSCF) on key material properties as cathode for intermediate temperature solid oxide fuel cells (IT-SOFC). The doped products Pr 0.6 Sr 0.4 (Co 0.2 Fe 0.8 ) (1Àx) Sc x O 3Àd (PSCFS x , x¼0.0e0.2) retained perovskite structure confirmed by X-ray diffraction, and their particles were smaller than the non-doped materials as evidenced by TEM. The electrical conductivity (EC) of PSCFS x decreased with increasing Sc 3þ content, but EC values were still larger than 100 S cm À1 in temperature range of 300e800 C as x 0.1. The thermal expansion coefficients (TEC) of PSCFS x were observed to generally decrease with increasing x especially at lower temperature range of 50e600 C. In addition, the AC impedance revealed better electrochemical performance of PSCFS x cathode as x 0.1 than that of the undoped sample PSCF. Therefore, PSCFS x (x 0.1) shows some potential as cathode electrode for IT-SOFC. The function of Sc 3þ dopant was tentatively elucidated and discussed.