SOFC Powders and Unit Cell Research at NIMTE

Abstract

(La0.75Sr0.25)0.95MnO3{plus minus}δ(LSM), (La0.6Sr0.4)0.9Co0.2Fe0.8O3-δ(LSCF), La0.6Sr0.4CoO3−δ(LSC), Ce0.9Gd0.1O1.95(CGO) nano-powders and LSM+YSZ, LSCF+CGO, LSC+CGO composite cathodes have been researched at Ningbo Institute of Material Technology & Engineering (NIMTE), Chinese Academy of Sciences and reported in this paper. Microstructure characterizations and electrical properties measurement showed these resultant powders are high purity, single phase, slight aggregation with grain size less than 100 nm and high performances. Excellent polarization resistance of 0.18Ω.cm2 at 750{degree sign}C, 0.12Ω.cm2 at 700{degree sign}C, 0.12Ω.cm2 at 650{degree sign}C were obtained respectively in the LSM+YSZ/YSZ/LSM+YSZ, LSCF+CGO/CGO/LSCF+CGO and LSC/CGO/YSZ/CGO/LSC symmetric cells. Anode supported Cells with configuration of Ni+YSZ/YSZ/LSM+YSZ, Ni+YSZ/YSZ/CGO/LSCF+CGO and Ni+YSZ/YSZ/CGO/LSC+CGO exhibited the maximum power density of 0.63W/cm2 at 750{degree sign}C, 0.54W/cm2 at 700{degree sign}C and 0.42W/cm2 at 650{degree sign}C (H2/air, active electrode area of 4X4 cm2), respectively. These results indicated that the YSZ-based anode supported cells with LSM-YSZ, LSCF-CGO, LSC-CGO composite cathode have the feasibility to be operated at 750-650{degree sign}C with an acceptable power density.