Abstract:

Co-pressing and direct forming process has been developed for the preparation of a single-chamber solid oxide fuel cell (SC-SOFC), which consists of 8%(x) Y2O3-stabilized ZrO2 (YSZ) electrolyte, Ni-YSZ cermet anode and La0.7Sr0.3MnO3 (LSM) cathode. Scanning electron microscopy (SEM) showed tight integration between the cathode and electrolyte and good loading performance of LSMon the YSZ three-dimensional framework. The thickness of the YSZ electrolyte film, the anode and the cathode was about 50, 600 and 100 μm, respectively. The effects of temperature (T), number of catalyst loading layers (n) and the volume ratio of CH4 and O2 (Rmix=V(CH4)/V(O2)) on the SC-SOFC performance was studied. At T =800 C, n=2 and Rmix=2, the single cell performed the best, the open voltage was 0.95 V, the maximumcurrent density was 130 mA·cm-2 and the maximumpower density was 30 mW·cm-2.

Key words: Solid oxide fuel cell, Co-pressing and direct forming process, YSZ three-dimensional framework, Catalyst loading performance