International Journal of Hydrogen Energy, Vol.38, No.35, 15348-15353, 2013
High performance intermediate temperature micro-tubular SOFCs with Ba0.9Co0.7Fe0.2Nb0.1O3-delta as cathode
In this study, anode supported intermediate temperature micro-tubular solid oxide fuel cells (MT-SOFCs) have been fabricated by combination of phase-inversion, dip-coating, co-sintering and printing method. The MT-SOFC consists of a similar to 300 mu m wall-thickness NiSc2O3 stabilized ZrO2 (ScSZ) anode tube, similar to 10 mu m ScSZ dense electrolyte layer, similar to 10 mu m Ce0.9Gd0.1O2-delta (GDC) membrane buffer layer and similar to 50 mu m Ba0.9Co0.7Fe0.2Nb0.1O3-delta (BCFN) cathode layer. SEM and electrochemical impedance spectroscopy (EIS) analysis suggested that the novel structured anode can remarkably diminish the porous anode geometrical tortuosity and improve the fuel gas diffusivity. High peak power densities of 0.34, 0.51 and 0.72W cm(-2) have been achieved with humidified hydrogen as the fuel and ambient air as oxidant at 550, 600 and 650 degrees C, respectively. Further, the cell has demonstrated a very stable performance with no significant cell voltage degradation under a constant current of 0.6 A cm(-2) for over 213 h test at 650 degrees C. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.