甘氨酸-硝酸盐法制备中温SOFC电解质及电极材料

采用一种新的燃烧合成陶瓷粉末的方法--甘氨酸-硝酸盐法合成中温SOFC所有元件的初始粉体,电池的电解质材料是(CeO₂)x(SmO_1.5)_{1-x(x=0.9,0.85,0.8),阳极材料是掺(CeO2)0.8(SmO1.5)0.2(SDC)的NiO,阴极材料是SDC与La0.6Sr0.4Fe0.8Co0.2O3的复合材料.其中以(CeO2)0.9(SmO1.5)0.1为电解质的单电池性能最好,在750℃时短路电流密度为0.5A/cm²,最大功率密度达0.104W/cm².通过SEM结果分析,掺杂摩尔分数20%SmO1.5的电解质晶界非常明显,而掺杂10%的电解质晶界有很强的融合消失的趋势.}

Electrolyte and Electrode Materials of Intermedium-temperature SOFC Prepared by Glycine-nitrate Process

By using a new combustion synthesis method, the glycine nitrate process, all the nano-size materials were prepared for a single solid oxide fuel cell(SOFC), in which(CeO₂) x (SmO_1.5)_1-x (x=0.9, 0.85, 0.8) were used as the electrolytes, La_0.6Sr_0.4Fe_0.8Co_0.2O₃with 50% samaria doped ceria(SDC) was selected as the cathode material, and a SDC-NiO-Ni composite powder was used as the anode material. In this study, the performance of the SOFCwas obtained up to 750 ℃, the maximum power density of 0.104 W/cm²and a short circuit current density of 500 mA/cm²of the cell was achieved at 750 ℃ by using (CeO₂)_0.9(SmO_1.5)_0.1electrolyte. The inferior SOFCperformance of the (CeO₂)_0.8(SmO_1.5)_0.2electrolyte was due to the physical discontinuity at the clearly grain boundary and could effectively introduce barriers to ionic conduction in reducing atmosphere, while the (CeO₂)_0.9(SmO_1.5)_0.1electrolyte′s boundary tends to be merged.