中温固体氧化物燃料电池阴极Sr3Fe2-xNixO7-δ（x=0,0.1,0.2,0.3）的制备与性能  

Preparation and Performance of Sr3Fe2-xNixO7-δ（x=0, 0.1, 0.2, 0.3）Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

作　　者：赵忱 张婷 和永 曲亮武 周青军[1] ZHAO Chen;ZHANG Ting;HE Yong;QU Liang-Wu;ZHOU Qing-Jun(College of Science,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学理学院

出　　处：《无机化学学报》2019年第6期1027-1033,共7页Chinese Journal of Inorganic Chemistry

基　　金：天津市教委科研计划(No.2018KJ254);中央高校基本科研业务费(No.3122017083)资助项目

摘　　要：采用溶胶凝胶法(sol-gel)合成了Sr3Fe2-xNixO7-δ(x=0,0.1,0.2,0.3)系列阴极材料,通过X射线衍射、热膨胀系数测试、电导率测试、极化阻抗(Rp)测试、单电池性能测试等对材料的物相结构、热力学性能、电化学性能进行了表征。结果表明,所有样品均成功合成为具有类钙钛矿结构的单一纯相。热膨胀系数随着Ni元素掺杂含量的提高而不断下降。其高温电导率随着Ni元素掺杂含量的提高而升高,SFN30具有该系列最高的电导率101S·cm^-1。该系列样品的极化阻抗随着Ni元素掺杂含量的提高呈现先下降后上升的趋势,SFN10在800℃具有小的极化阻抗(Rp=0.0788Ω·cm2)。电解质支撑的单电池输出功率变化趋势与极化阻抗趋势一致,SFN10在800℃获得421.6mW·cm^-2的输出功率密度。Sr3Fe2-xNixO7-δ(x=0,0.1,0.2,0.3) were synthesized by a modified complexing sol-gel process as cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs).The phase structure,thermodynamic properties and electrochemical properties of the materials were characterized by X-ray diffraction,thermal expansion coefficient test,conductivity test,polarization impedance (Rp) test and single cell performance test.The results showed that all samples were successfully synthesized with perovskite-like structure.The Sr3Fe2-xNixO7-δ cathode exhibited good chemical compatibility with the Ce0.8Sm0.2O1.9 (SDC) electrolyte at 1 000 ℃ for 5 h.The coefficient of thermal expansion (TEC) decreased with the increase of x,and the minimum value was 1.839×10^-5 K^-1.Its high temperature conductivity increased with the increase of Ni doping content,and SFN30 had the highest conductivity of 101 S·cm^-1.The Rp of this series of samples showed a trend of decrease first and then increase with the increase of the doping content of Ni.SFN10 had the lowest polarization impedance of 0.078 8 Ω·cm2 at 800 ℃.The trend of the output power of the electrolyte-supported cell was consistent with the trend of polarization impedance.The SFN10 achieved an output power density of 421.6 mW·cm^-2 at 800 ℃.

关 键 词：Sr3Fe2-xNixO7-δ 类钙钛矿结构 中温固体氧化物燃料电池 阴极材料 

分 类 号：O614.81[理学—无机化学]