Cobalt-free quintuple perovskite Sm1.875Ba3.125Fe5O15−δ as a novel cathode for intermediate temperature solid oxide fuel cells. Issue 8 (June 2016)

• Record Type: Journal Article
• Authors: Zhou, Qingjun; Chen, Libing; Cheng, Ye; Xie, Yantao
• Is Part Of: Ceramics international. Volume 42:Issue 8(2016)
• Page Start: 10469
• Page End: 10471
• Publication Date: 2016-06
• Subjects: Solid oxide fuel cells -- Cobalt-free Cathode -- Quintuple perovskite -- Sm1.875Ba3.125Fe5O15−δ; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.03.174
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A novel cobalt-free quintuple perovskite Sm1.875 Ba3.125 Fe5 O15− δ (SBF) oxide is synthesized and evaluated as cathode for IT-SOFCs. The chemical compatibility, electrical conductivity, thermal expansion coefficient and electrochemical performance are investigated. The SBF exhibits a good chemical compatibility with the La0.9 Sr0.1 Ga0.8 Mg0.2 O3− δ (LSGM) electrolyte at 1000 °C for 5 h. Its electrical conductivity is 9.2–11.8 S cm −1 over the temperature range of 600–800 °C. The average TEC of SBF is 17.2×10 −6 K −1 between 30 °C and 1000 °C. The area specific resistances of the SBF cathode on LSGM are 0.075 Ω cm 2 and 0.117 Ω cm 2 at 800 °C and 750 °C, respectively. Maximum power density is as high as 417 mW cm −2 at 800 °C based on a 300 μm thick LSGM electrolyte. Preliminary results imply that SBF is an excellent oxygen reduction electrode candidate for IT-SOFCs.