La0.6Sr0.4Fe0.8Cu0.2O3−δ perovskite oxide as cathode for IT-SOFC

• Published in: International journal of hydrogen energy Vol. 37; no. 16; pp. 11963 - 11968
• Main Authors: Zhou, Qingjun, Xu, Le, Guo, Yajie, Jia, Dan, Li, Yan, Wei, W.C.J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2012; Elsevier
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Cathode; Electrical conductivity; Energy; Exact sciences and technology; Fuels; Hydrogen; Perovskite; Solid oxide fuel cells; Perovskite; Solid oxide fuel cells; Electrical conductivity; Cathode; Thermal expansion; Electrical properties; Hydrogen; Electrode material; Cerium oxide; Solid oxide fuel cell; Fuel cell
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2012.05.114

A La0.6Sr0.4Fe0.8Cu0.2O3−δ (LSFCu) perovskite was investigated as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFC). The LSFCu material exhibited chemical compatibility with the Sm0.2Ce0.8O1.9 (SDC) electrolyte up to a temperature of 1100 °C. The electrical conductivity of the sintered sample was measured as a function of temperature from 100 to 800 °C. The highest conductivity of about 238 S cm−1 was observed for LSFCu. The average thermal-expansion coefficient (TEC) of LSFCu was 14.6 × 10−6 K−1, close to that of typical CeO2 electrolyte material. The investigation of electrical properties indicated that the LSFCu cathode had lower interfacial polarization resistance of 0.070 Ω cm2 at 800 °C and 0.138 Ω cm2 at 750 °C in air. An electrolyte-supported single cell with 300 μm thick SDC electrolyte and LSFCu as cathode shows peak power densities of 530 mW cm−2 at 800 °C.
► Cobalt-free La0.6Sr0.4Fe0.8Cu0.2O3−δ (LSFCu) was evaluated as cathode for IT-SOFC. ► LSFCu is chemical compatibility with SDC electrolyte. ► LSFCu has conductivities of 238–190 S cm−1 at 600–800 °C in air. ► The interfacial polarization resistance value of LSFCu were 0.306 Ω cm2 at 700 °C.