中温SOEC氧电极材料La_(x)Sr_(1-x)-MnO_(3)性能的优化

Performance optimization of oxygen electrode material La_(x)Sr_(1-x)-MnO_(3) for medium temperature SOEC

La_(x)Sr_(1-x)MnO_(3)(LSM)因较高的电子电导率被广泛用作中温固体氧化物电解池(SOEC)的氧电极材料,但是离子电导率偏低。为提升LSM基氧电极的性能,向LSM中复合Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF),制备LSM-BSCF复合氧电极材料,研究LSM-BSCF作为氧电极电解池的性能。在开路电压1.5 V和工作温度800℃的条件下,基于质量比为6∶1的LSM-SDC与BSCF-SDC氧电极SOEC,极化阻抗为2.27Ω/cm^(2),离子电导率为0.0405 S/cm,电流密度为0.16 A/cm^(2),优于LSM-SDC基氧电极SOEC。这表明,向LSM中复合一定比例的BSCF,可以提升SOEC的电化学性能。

La_(x)Sr_(1-x)-MnO_(3)(LSM)was widely used as the oxygen electrode material of medium temperature solid oxide electrolytic cell(SOEC)because of its high electronic conductivity,but its ionic conductivity was very low.To improve the performance of the LSM-based oxygen electrode,Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF)was compounded into LSM,LSM-BSCF composite oxygen electrode material was prepared,the performance of the electrolytic cell with LSM-BSCF as an oxygen electrode was studied.When the open circuit voltage was 1.5 V and the working temperature was 800℃,the polarization impedance of SOEC based on oxygen electrode of LSM-SDC and BSCF-SDC with mass ratio of 6∶1 was 2.27Ω/cm^(2),the ionic conductivity was 0.0405 S/cm,the current density was 0.16 A/cm^(2),which was better than the performance of LSM-SDC based oxygen electrode SOEC.It showed that compounding a certain percentage of BSCF into LSM could enhance the electrochemical performance of SOEC.