| Nowadays, one of the most important development of SOFC is to reduce the operating temperature from 1000℃to 600~800℃. One of the most effective measures to lower the operating temperature is to reduce the thickness of the electrolyte layer and using the planar SOFC structure.In this thesis, 8YSZ as electrolyte and NiO-8YSZ-graphite as anode were successfully fabricated using inexpensive aqueous tape casting method. The thickness of the electrolyte and anode green sheets were 20μm and 800μm. The cosintering process of the large electrolyte and anode green sheets were studied, and then the discipline and the cosintering technology were obtained. Anode-supported planar half cells of dimensions 10 cm×10 cm×0.5 mm have been successfully fabricated.The theses innovatively pointed out that nano-crystalline La0.8Sr0.2MnO3 (LSM) powder were synthesized by citrate sol-gel method under microwave operation and oven heat. Comparing with the investigation, the glycine-nitrate process was used to prepare the LSM powder. It showed that LSM powder synthesized by citrate sol-gel method under microwave operation had much smaller grain size, non-agglomeration and higher high electro-catalytic activity. When used as catalyst, it can enhance the reaction speed of the cathode. The maximum power density of the cell was 0.6W/cm~2.Muti-layer aqueous tape casting of the anode active layer with fine microstructure was studied, and screen printing of the cathode active layer with fine microstructure was also introduced. Then the single cells with different microstructure were prepared. The effect of different microstructure on the cell performance was investigated by electro-chemical performance test. When introducing the anode active layer(Ni/SSZ) and cathode active layer(LSM/SSZ) with uniform pore space, the maximum power density of the cell can achieve 0.76 W/cm2(800℃), compared to the single cell with no anode active layer and cathode active layer, the maximum power density was 0.56 W/cm2(800℃). |
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