SOEC阴极材料Sr_2FeMoO_(6-δ)的微观结构和性能

Microstructure and Properties of Sr_2FeMoO_(6-δ) as Cathode Materials for SOEC

选用双钙钛矿结构Sr_2FeMoO6-δ作为固体氧化物电解池的阴极材料,经过压制成型和烧结制备成阴极。利用阿基米德法测定了阴极的孔隙率,结合扫描电子显微镜研究造孔剂的用量对阴极孔隙结构的影响。利用热分析仪测定了不同孔隙结构的阴极受热后热膨胀情况和热膨胀系数,研究其与电解质的热膨胀系数匹配情况。最后利用电化学工作站测试了阴极材料的电化学性能。实验结果表明,双钙钛矿结构Sr2Fe Mo O6-δ有较好地电化学性能以及与电解质LSGM热膨胀系数匹配,有望成为固体氧化物电解池阴极的理想候选材料。

Double perovskite Sr_2FeMoO_(6-δ)was investigated as cathode material for solid oxide electrolysis cells. After dry-pressing and sintering, cathodes were prepared. The effect of starch contents on pore structures of Sr_2FeMoO_(6-δ)cathodes was studied. Porosity of cathodes was measured by the Archimedes method, and the microstructures of Sr_2FeMoO_(6-δ)cathodes were observed by scanning electron microscopy(SEM). Thermal expansion coefficient(TEC) of Sr_2FeMoO_(6-δ)cathodes and LSGM electrolyte were measured by thermal dilatometer. Electrical conductivity of cathodes were tested by a four-probe method on electrochemical workstation. All the results demonstrate that double pervoskite Sr_2FeMoO_(6-δ)has great potential as cathode material for solid oxide electrolysis cells.