Fabrication And Characterization Of Functional Composite Electrode In SOFC

The ability of Solid Oxide Fuel cells (SOFCs) to directly and efficiently convert the chemical energy in hydrocarbon fuels to electricity in the clean energy revolution. The tape casting and infiltration process used in this dissertation to fabricate nano functional composition SOFC electrodes. It includes:tape casting tri-layer electrolyte (porous electrolyte‖dense electrolyte‖porous electrolyte); modification of LSCF cathode by infiltration; developing novel sulfur tolerance anode.For tri-layer electrolyte, tri-YSZ and tri-GDC electrolyte were overcastted in this thesis. Tri-YSZ was sintered at 1250-1400℃, and tri-GDC was sintered at 1400℃. Different materials were infiltrated into porous YSZ, and the performance of full cells was characterized.La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) was modified by simulation and experiments. At first, the degradation and modification mechanism of LSCF was explored. Based on the above research, infiltration process was optimized and a stable and repeatable LSCF cathode was developed by tape casting. The performance of anode supported cell with LSM infiltration LSCF functional composite cathode is about 1.6W/cm2 at 800℃.Anode supported half cell was overcastted, including electrolyte/anode substrate overcasting, electrolyte/anode active layer/anode substrate overcasting. After optimizing the process, the performance of anode supported cell is about 1.1W/cm2 at 800℃.