Metal-supported Solid Oxide Fuel Cell with La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ Cathode

Monday, 27 July 2015
Hall 2 (Scottish Exhibition and Conference Centre)
T. Zhu (China University of Mining and Technology, Beijing), M. Han (Department of Thermal Engineering, Tsinghua University), and Z. Yang (China University of Mining and Technology, Beijing)
Metal-supported solid oxide fuel cells (SOFCs) exhibited significant advantages, for example the superior mechanical strength, easy-processing and lower cost. In this paper, we report a new fabrication method for metal-supported SOFC single cell. The single cell with NiO and Fe2O3 (Ni:Fe=1:1) anode support, Gd0.1Ce0.9O1.95 (GDC) electrolyte and La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ (LSCFN) cathode was fabricated by traditional tape-casting, drop-coating, co-sintering and screen-printing techniques. Then the as-prepared single cell was reduced at 500, 600, 700 oC under 5%H2-95%N2. Results show that after treated the whole cell at 700 oC in the reducing atmosphere, the oxide support was mostly reduced into metal, while the LSCFN cathode maintained its perovskite structure. Then the cell performance was tested using humidified hydrogen, by comparison, the as-prepared cell without reduction was also tested. Electrical impedance spectroscopy tests were carried out with symmetrical LSCFN electrodes reduced at 500-700 oC. Results show that the polarization resistance lowered down with the reduction temperature increased, which may possibly due to the more oxygen vacancies created at higher reduction temperature. The fabrication method to reduce the whole cell is a promising way to fabricate the easy-processing metal-supported SOFC single cell.