Tubular SOFC with Hollow Fiber Ceramic Support and Inner Coating

In this work, zirconia supported segmented-in-series type single cell with inner side coating was studied. The support tube was fabricated through phase-inversion method using 3%mol Y₂O₃ doped ZrO₂ (TZP). Then the NiO-8%mol Y₂O₃ stabilized ZrO₂ (YSZ) anode layer, YSZ electrolyte layer and (La_0.8Sr_0.2)_0.95Mn₃O_3-δ (LSM)-YSZ cathode layer and LSM layer was applied by screen printing and high-temperature sintering in proper orders. Finally, La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-δ (LSCFN) - Gd_0.1Ce_0.9O_1.95 (GDC) composite layer was coated on the inner side of the support tube. Cell performance characterization was conducted using room-temperature humidified hydrogen and methane at a gas flow rate of 40mL/min inside the tube and ambient air at cathode side. Results show that, the open circuit voltage at 850 ^oC under H₂ and CH₄ was 1.04V and 1.08V separately, while the corresponding maximum power density was 96 and 106 mW/cm² respectively. No obvious degradations were observed in the stability test under humidified H₂ for 50h and CH₄ for 250h.