硅酸盐学报

Co/Ni掺杂SrTi0.3Fe0.7O3–钙钛矿电极材料制备及性能

作者：倪维婕1 朱腾龙1 陈晓阳1 钟秦1 韩敏芳2

单位：(1. 南京理工大学化工学院南京210094 2. 清华大学能源与动力工程系电力系统及发电设备控制和仿真国家重点实验室北京100084)

分类号：TQ174.1

出版年,卷(期):页码：2019,47(3):0-0

DOI：

摘要：

以SrTi0.3Fe0.7O3–δ (STF)为基础，研究了B位Co、Ni掺杂SrTi0.3(Fe1–xCox)0.7O3–δ (STFC)和SrTi0.3(Fe1–yNiy)0.7O3–δ (STFN)钙钛矿氧化物的成相过程及其在还原气氛中的结构演变规律，并进一步表征了其用于固体氧化物燃料电池(SOFC)对称电极的电化学性能。结果表明：Co和Fe可以在B位无限互溶，形成SrTi0.3Fe0.7O3–δ–SrTi0.3Co0.7O3–δ固溶体系；但当Ni替换Fe的比例超过约30%时就会出现明显的Sr2Fe2O5杂相。在还原气氛中，STFC和STFN的结构稳定性随Co或Ni掺杂量的增加而降低，并逐渐由ABO3结构转变为富AO相的钙钛矿衍生结构，同时伴随着Co基或Ni基金属相的生成。在850 ℃和加湿氢气燃料下，La0.8Sr0.2Ga0.83Mg0.17O3–δ电解质支撑SrTi0.3(Fe0.9Ni0.1)0.7O3–δ和SrTi0.3(Fe0.9Co0.1)0.7O3–δ对称电池的最大功率密度分别达到约1.00和0.87 W/cm2，表现出较好的电化学性能和实用前景。

Cobalt and nickel substituted SrTi0.3Fe0.7O3–δ perovskite oxides, i.e., SrTi0.3(Fe1–xCox)0.7O3–δ (STFC) and SrTi0.3(Fe1–yNiy)0.7O3–δ(STFN), were synthesized. Their structure evolutions in reducing atmospheres were investigated, and their electrochemical properties as symmetrical electrodes in solid oxide fuel cell were characterized. The results show that solid solutions from SrTi0.3Fe0.7O3–δ to SrTi0.3Co0.7O3–δ are effectively synthesized, and impurity phases of Sr2Fe2O5 occur in STFN system with a substituted nickel ratio of > 30% to iron. After reduction in reducing atmosphere, the structure stability of STFC and STFN decreases with the increase of doping amount of Co or Ni, and the ABO3 structurechanges to AO-rich perovskite-derived structure and cobalt- or nickel-based metallic phases appear. SrTi0.3(Fe0.9Ni0.1)0.7O3–δ and SrTi0.3(Fe0.9Co0.1)0.7O3–δ symmetrical cells with La0.8Sr0.2Ga0.83Mg0.17O3–δ electrolyte supports both have the maximum power densities of 1.00 and 0.87W/cm2, respectively, in wet hydrogen fuel, which could be used for the promising applications.

基金项目：

国家自然科学基金(51702163)；江苏省自然科学基金(BK20170847)。

作者简介：

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