CAJ | 학술논문

采用固相法合成了类钙钛矿结构的中温固体氧化物燃料电池(IT-SOFC)阴极材料Nd_(2-x)Sr_xCuO_4(简称NSC,x=0.0～0.1).通过XRD和SEM对材料进行了表征.结果表明该阴极材料与电解质Ce_(0.9)Gd_(0.1)O_(1.9)(CGO)在1 000℃烧结4 h后不发生化学反应,具有良好的化学相容性;且烧结后二者之间能形成良好的接触界面.利用交流阻抗谱研究了电极的性能.发现随着Sr掺杂量的增加,极化电阻逐渐减小,其中Nd_(1.93)Sr_(0.07)CuO_4在空气中的极化电阻最小,750℃时仅为0.14 Ω·cm~2.700℃时,电极反应的速率控制步骤为电极上发生的电荷转移过程.
채용고상법합성료류개태광결구적중온고체양화물연료전지(IT-SOFC)음겁재료Nd_(2-x)Sr_xCuO_4(간칭NSC,x=0.0～0.1).통과XRD화SEM대재료진행료표정.결과표명해음겁재료여전해질Ce_(0.9)Gd_(0.1)O_(1.9)(CGO)재1 000℃소결4 h후불발생화학반응,구유량호적화학상용성;차소결후이자지간능형성량호적접촉계면.이용교류조항보연구료전겁적성능.발현수착Sr참잡량적증가,겁화전조축점감소,기중Nd_(1.93)Sr_(0.07)CuO_4재공기중적겁화전조최소,750℃시부위0.14 Ω·cm~2.700℃시,전겁반응적속솔공제보취위전겁상발생적전하전이과정.
Perovskite-type cathode materials Nd_(2-x)Sr_xCuO_4 (NSC) for intermediate temperature solid oxide fuel cell (IT-SOFC) were prepared with the conventional solid state reaction methods. These powders were characterized by XRD and SEM. The results showed that NSC has no reaction with Ce_(0.9)Gd_(0.1)O_(1.9) (CGO) at 1 000 ℃ in air and the electrode formed good contact with the electrolyte after sintered at 1 000 ℃ for 4 h. The electrochemical performance of the cathode was investigated using AC impedance spectroscopy. The polarization resistance decreased with the doping of strontium in the lattice. The optimum value of Nd_(1.93)Sr_(0.07)CuO_4 resulted in 0.14 Ω·cm~2 area specific resistance (ASR) at 750 ℃ in air. The charge transfer process was the rate-limiting step of the electrode reactions at 700 ℃ in air.