Preparation of solid oxide fuel cells bya reaction-sintering process
碩士 === 崑山科技大學 === 電子工程研究所 === 98 === Solid oxide fuel cells (SOFCs) prepared by the reaction-sintering process were investigated in this thesis. The mixture of raw materials was sintered directly without any calcination step. Grains of 4-5 μm were observed in porous GdxCe(1-x)O(2-x/2) (x=0.1, 0.2) e...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/01453532047633749923 |
| Summary: | 碩士 === 崑山科技大學 === 電子工程研究所 === 98 === Solid oxide fuel cells (SOFCs) prepared by the reaction-sintering process were investigated in this thesis. The mixture of raw materials was sintered directly without any calcination step. Grains of 4-5 μm were observed in porous GdxCe(1-x)O(2-x/2) (x=0.1, 0.2) electrolyte ceramics sintered at 1500oC for 6 h. Temperatures higher than 1500oC were necessary for highly dense GdxCe(1-x)O(2-x/2) pellets.
La0.8Sr0.2FeO3 cathode ceramics with 23.9-38.2% porosity could be obtained after 2 h sintering at 1200-1270oC. 2.3-32.6% porosity formed in 6 h sintering La0.8Sr0.2FeO3 pellets. Grains about 1μm formed in 2-6 h sintering La0.8Sr0.2FeO3. 15-38% porosity was measured in La0.85Sr0.15MnO3 cathode ceramics sintered at 1170-1270oC. Porous pellets with ~3μm grains were found in La0.85Sr0.15MnO3 sintered at 1200oC for 2 h. The amount of pores deceased with increased sintering temperature and soak time. The porosity could be effectively controlled by adjusting the sintering temperature and soak time. Grains of ~1 μm were observed in porous Sr0.895Y0.07TiO3 anode ceramics sintered at 1250oC for 4 h.
Thermal expansion coefficient of La0.8Sr0.2FeO3 and La0.85Sr0.15MnO3 was found in the range 9.74×10-6-9.85×10-6 which is compatible with 1.09×10-5-1.08×10-5 for Gd0.9Ce0.1O1. 95 and Gd0.2Ce0.8O1.9.
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