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分别采用机械混合法和一步溶胶-凝胶法制备摩尔比为1:1的Ce_(0.8)Sm_(0.2)O_(1.9)(SDC)-BaCe_(0.8)Sm_(0.2)O_(2.9)(BCS)复合电解质,研究了不同制备方法对复合电解质SDC-BCS的显微结构以及电化学性能的影响。结果表明:相比于机械混合法,一步溶胶-凝胶法制得的复合电解质中的SDC和BCS两相的分布更加均匀;且与单相电解质SDC相比,复合电解质中SDC和BCS的相界能够为质子和氧离子提供传输通道,有利于晶界电导率的提高。另外,一步溶胶-凝胶法制备的复合电解质制作的单电池,具有较高的开路电压和最大功率密度,在700℃时分别达到0.914 V和0.281 W/cm~2。
(0.8) Sm 0.2 O 1.9 (SDC) -BaCe 0.8 Sm 0.2 O 2.9 (BCS) with a molar ratio of 1: 1 were prepared by mechanical mixing and one-step sol- ) Composite electrolytes, the effects of different preparation methods on the microstructure and electrochemical performance of the composite electrolyte SDC-BCS were studied. The results show that compared with the mechanical mixing method, the distribution of SDC and BCS in the composite electrolyte prepared by the one-step sol-gel method is more uniform than the single-phase electrolyte. Compared with the single-phase electrolyte SDC, the phase boundary of SDC and BCS in the composite electrolyte It can provide the transmission path for protons and oxygen ions, which is conducive to the improvement of grain boundary conductivity. In addition, the single cell prepared by one-step sol-gel method has a higher open-circuit voltage and maximum power density of 0.914 V and 0.281 W / cm ~ 2 at 700 ℃.