高温电解水用锰酸锶镧基氧电极的稳定性

Stability of Sr-doped LaMnO_3 oxygen electrode for high temperature water electrolysis

用丝网印刷工艺制备锰酸锶镧基氧电极用于高温固体氧化物电解池(SOEC),结合电解池的电流密度(J)-电压(U)曲线和电化学阻抗谱,考察温度和水蒸气含量对SOEC性能的影响。在800℃和电流密度0.25 A/cm2的条件下测试高温电解水的稳定性。30 h后,SOEC的衰减率为6.2%。测试后的电池微观结构表明:氧电极与电解质分层,导致SOEC性能衰减。

Strontium（Sr）-doped lanthanum manganite（LSM）-based oxygen electrodes were prepared by a screen printing method for high temperature solid oxide electrolysis cell（SOEC）. In combination with current density （J）-voltage （U）curves and electro- chemical impedance spectroscopy, effects of temperature and steam content on the performance of SOEC were investigated. The stability of high temperature water electrolysis under the condition of 800 ℃ and the current density of 0. 25 A/cm2 was tested. After 30 h, the degradation rate of SOEC was 6. 2%. The microstructure of the post-test cell indicated that the performance degradation of SOEC was attributed to the delamination of oxygen electrode from electrolyte.