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

Abstract

Abstract In this paper we present results for a high power density IT‐SOFC and a method for dispersing nanosized Ce 0.9 Gd 0.1 O 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 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 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 °C 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 °C.