Performance of IT-SOFC with Ce_0.9Gd_0.1O_1.95 Functional Layer at the Interface of Ce_0.9Gd_0.1O_1.95 Electrolyte and Ni-Ce_0.9Gd_0.1O_1.95 Anode

摘要

In this paper we present results for a high power density ITSOFC and a method for dispersing nanosized Ce_0.9Gd_0.1O_1.95 (GDC) particles at the GDC electrolyte and Ni-GDC anode interface. Dispersed nanosized particles were deposited to form an anode functional layer (AFL). Anode supports were prepared by tape casting of large micron-sized NiO powder and sub micron-sized GDC powder without pore former. For the cathode a La_0.6Sr_0.4Co_0.2Fe_0.8O_(3 -δ) (LSCF)-GDC composite was used. Without an AFL the open circuit potential (OCP) and the maximum power density were 0.677 V and 407 mW cm~(-2), respectively, at 650℃ using 30 sccm of hydrogen and air flow-rate. With an AFL the OCP and the maximum power density increased to 0.796 V and 994 mW cm~(-2), respectively, at the same temperature. Two point probe impedance measurements revealed that the AFL fabricated by the proposed method not only increased the OCP but also reduced the electrode polarisation by 68%. The effect of gas flow-rate is also present in this paper. When hydrogen and air flow-rate is increased to 90 sccm, the sample with AFL obtained 1.57 W cm~(-2) at 650℃.