氧化物电解池阳极用铁酸镧粉体的制备及性能  

Preparation and Performance of Strontium-doped Lanthanum Ferrite Powder Used in Solid Oxide Electrolysis Cell Composite Anode

作　　者：孔江榕[1,2] 张勇[1] 戴遐明[1] 邓长生[1] 徐景明[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《中国粉体技术》2010年第2期12-14,共3页China Powder Science and Technology

摘　　要：采用溶胶-凝胶自蔓延法合成锶掺杂铁酸镧粉体,在此基础上制备锶掺杂铁酸镧与钇稳定的氧化锆的复合材料,并研究该材料应用于固体氧化物电解池阳极的各方面性能。通过X射线衍射、透射电镜、扫描电镜等手段,研究该材料的化学稳定性及微观结构。通过动电位扫描研究了该阳极材料的电化学性能。透射电镜分析显示:以该方法制备得到的锶掺杂铁酸镧粉体粒径在20～50nm之间,颗粒形状较为规则。扫描电镜结果显示:经过1200℃、2h的烧结后,复合阳极与电解质结合紧密,阳极材料内部孔隙均匀,钇稳定的氧化锆与锶掺杂铁酸镧两相各自形成连通的网络结构。对锶掺杂铁酸镧-钇稳定的氧化锆阳极复合材料的电化学性能及热循环稳定性进行了研究,结果显示复合阳极表现出较高的电催化活性以及较好的耐热循环稳定性。A sol-gel self-propagating method was utilized to prepare strontium-doped lanthanum ferrite （LSF） powder. The LSF and yttria stabilized ZrO2 （YSZ） composite materials were fabricated and used as the anodes of solid oxide electrolysis cell （SOEC）. Their various properties were also investigated. Their chemical stability and microstructure were analyzed by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and scanning electron microscopy （SEM）. The electrochemical performances of the materials were evaluated by anodic polarization tests. TEM results showed that the particle size of the prepared LSF powder with regular shape was about 20-50 nm. SEM images of LSF-YSZ composite anodes sintered at 1 200 ℃ for 2 hours showed that the anode layer combined closely with the electrolyte and regular pores within the anodes were observed. In addition, the YSZ and LSF phases formed interconnected pore structures respectively. Finally, the electrochemical properties and thermal stabilities of the LSF-YSZ anode composites were invetigated. The results showed that the composite anodes exhibited better catalysis activity and thermal cycle endurance.

关 键 词：固体氧化物电解池 复合阳极 溶胶-凝胶自蔓延法 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]