中文摘要：

以三氧化二钐、浓硝酸、硝酸铈铵、柠檬酸为原料，采用溶胶-凝胶法低温（900℃）制备Ce0.8Sm0.2O2–α（SDC），低于通常高温烧结温度（1400℃），并与(Li/K)2CO3共熔体进行复合。采用DSC-TGA确定制备Ce0.8Sm0.2O2–α的烧结温度。XRD结果表明，(Li/K)2CO3与Ce0.8Sm0.2O2–α复合后没有发生化学反应。SEM图像表明，SDC粒径均匀一致，(Li/K)2CO3作为SDC颗粒黏结剂均匀覆盖SDC颗粒表面。采用电化学工作站研究了复合电解质在400～600℃下干燥氮气气氛中的电导率。结果表明，温度为600℃时，复合电解质在干燥氮气气氛中的电导率达到最大值3.3×10-2S/cm，高于单一二氧化铈材料在相同条件下的电导率。氧分压与电导率关系曲线表明，复合电解质具有良好的氧离子导电性。H2/O2燃料电池性能测试表明复合电解质Ce0.8Sm0.2O2–α-(Li/K)2CO3（SDC-SG-LK）在600℃开路条件下的电解质阻抗、极化阻抗分别为3.13.·cm2、0.81.·cm2，最大输出功率密度为130mW/cm2。

英文摘要：

Ce0.8Sm0.2O2-αwas synthesized by sol-gel method at900℃using Sm2O3,HNO3,(NH4)2Ce(NO3)6,citric acid as raw materials and then compounded with(Li/K)2CO3.The preparation temperature(900℃)is much lower than conventional sintering temperature(1400℃).The sintering temperature of Ce0.8Sm0.2O2-α(SDC)was determined by DSC-TGA.The XRD results showed that there was no reactions between Ce0.8Sm0.2O2-αand(Li/K)2CO3.The SEM examinations revealed that the SDC particle size is uniform,and the surface is uniformly covered by(Li/K)2CO3that act as the SDC particle binder.The conductivity of the composite electrolyte in dry nitrogen was measured using electrochemical analyzer.The highest conductivity was3.3×10-2S/cm at600℃,which is higher than that of single CeO2material.The H2/O2fuel cell by the composite electrolyte showed that the electrolyte impedance and polarization impedance under open-circuit condition were3.13W·cm2and0.81W·cm2,respectively,and generated the maximum power density of130mW/cm2at600℃.