【摘要】 采用甘氨酸-硝酸盐法分别制备了Ce0.85Sm0.15O2-δ(SDC)与La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)两种电解质材料,并用固相混合法将两种材料按不同质量比(SDC与LSGM的质量比分别为9∶1,8∶2,5∶5)混合制备复合电解质材料.采用交流阻抗技术对样品的电学性能进行研究.实验结果表明,SDC与LSGM的质量比为9∶1(SL91)时,样品具有较高的电导率,在350~800℃温度范围内其电导率均比SDC的高.以复合电解质为支撑体,以Sm0.5Sr0.5CoO3为阴极、NiO/SDC为阳极制成单电池,测试结果显示,在800℃时以SL91为电解质的单电池的最大输出功率密度为0.25W/cm2,最大电流密度为1.06A/cm2.在电池的工作温度区间(600~800℃)内以复合材料为电解质的单电池的开路电压比以SDC为电解质的高.更多还原

【Abstract】 The electrolytes materials Ce0.85Sm0.15O1.925(SDC)and La0.9Sr0.1Ga0.8Mg0.2O2.85(LSGM) were synthesized by means of glycine-nitrate process(GNP), respectively, then the composite electrolytes were prepared by mixing SDC and LSGM(the mass ratio of SDC powder to LSGM powder are 9∶1, 8∶2, 5∶5, respectively). Its electrical properties were investigated by impedance spectroscopy in air. The results obtained shows that when the composition was 90% SDC and 10%(mass fraction) LSGM(SL91), the electrolyte has a higher electrical conductivity in comparison to SDC in the temperature range of 350—800 ℃. Electrolyte-supported solid oxide fuel cells(SOFC) was fabricated with NiO/SDC as the anode and Sm0.5Sr0.5CoO3 as the cathode. The V-I characteristics of single fuel cell shows that the maximum output power density was 0.25 W/cm2 at 800 ℃ and the maximum current density was 1.06 A/cm2 for the cell with SL91 as the electrolyte. The open circuit voltage(OCV) of the single fuel cell using the composite as the electrolytes was higher than the cell using single SDC as the electrolyte in the working temperature range of 600—800 ℃. It can be confirmed that to some extent, doping LSGM to SDC can block off the electronic current caused by the Ce4+/Ce3+ reduction process.更多还原