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
作者单位E-mail
赵忱 中国民航大学理学院, 天津 300300  
张婷 中国民航大学理学院, 天津 300300  
和永 中国民航大学理学院, 天津 300300  
曲亮武 中国民航大学理学院, 天津 300300  
周青军 中国民航大学理学院, 天津 300300 qjzhou@cauc.edu.cn 
摘要: 采用溶胶凝胶法(sol-gel)合成了Sr3Fe2-xNixO7-δx=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101 S·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=0.078 8 Ω·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421.6 mW·cm-2的输出功率密度。
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
基金项目: 天津市教委科研计划(No.2018KJ254)和中央高校基本科研业务费(No.3122017083)资助项目。
Abstract: 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℃.
Keywords: Sr3Fe2-xNixO7-δ  perovskite-like structure  intermediate temperature solid oxide fuel cells  cathode material
投稿时间:2019-01-10 修订日期:2019-03-28
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赵忱,张婷,和永,曲亮武,周青军.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[J].无机化学学报,2019,35(6):1027-1033.
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