Nd_(0.96)BaCo_(2)O_(6-δ)阴极的微结构调控与电化学性质研究  

Microstructure regulation and electrochemical properties of Nd_(0.96)BaCo_(2)O_(6-δ) cathode

作　　者：孙丽萍[1] 赵辉[1] SUN Liping;ZHAO Hui(Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学化学化工与材料学院功能无机材料化学教育部重点实验室,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2022年第5期548-554,F0003,共8页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(51872078);黑龙江省自然科学基金资助项目(LH2020E105)。

摘　　要：采用EDTA-柠檬酸法合成了Nd_(0.96)BaCo_(2)O_(6-δ)阴极材料,利用聚苯乙烯(PS)微球为造孔剂对Nd_(0.96)BaCo_(2)O_(6-δ)电极微观结构进行了优化,考察了电极微观结构对其电化学性能的影响。结果表明,电极的微观孔隙率随PS微球加入量的增大而增大,阴极极化电阻随着PS微球加入量的增加逐渐降低,加入30wt.%PS球作为造孔剂的阴极性能最佳,700℃时空气中极化面电阻仅为0.015Ω·cm^(2)。阴极反应机制研究表明,电极微观结构的调控显著优化了阴极上氧扩散过程,促进了氧还原反应进程,电荷转移过程为阴极上氧还原(ORR)反应的决速步骤。Nd_(0.96)BaCo_(2)O_(6-δ) cathode material was synthesized by EDTA-citric acid method. The microstructure of NdBaCoOelectrode was optimized by using polystyrene(PS) microspheres as pore-forming agent. The effect of electrode microstructure on the electrochemical performance of Nd_(0.96)BaCo_(2)O_(6-δ) electrode was investigated. The results showed that the microporosity of the electrode increased with the addition of PS balls, and the cathode polarization resistance gradually decreased with the increase of PS addition. The cathode performance with 30 wt.% PS balls as a pore former was the best and the area specific resistance(ASR) in gas was only 0.015 Ω cm^(2) at 700 ℃. The study of the electrode oxygen reduction reaction(ORR) mechanism showed that the regulation of the electrode microstructure significantly improved the oxygen diffusion process on the cathode and accelerated the oxygen reduction reaction process. The charge transfer process was the rate control step of the ORR reaction on the cathode.

关 键 词：固体氧化物燃料电池(SOFC) Nd_(0.96)BaCo_(2)O_(6-δ) 阴极微结构 电极反应 

分 类 号：O646.5[理学—物理化学]