| La2-xBixCuO4阴极材料的合成与电化学性质 |
| Synthesis and Electrochemical Properties of La2-xBixCuO4 Cathode Material |
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| 摘要: 采用甘氨酸-硝酸盐法合成了固体氧化物燃料电池阴极材料La2-xBixCuO4（x=0、0.05、0.10），并利用X射线衍射（XRD）对材料的物相进行分析。结果表明，La2-xBixCuO4形成单一的类钙钛矿结构氧化物，且晶胞体积随着铋掺杂量的增加而增大。在950℃烧结24 h过程中，La2-xBixCuO4不与电解质Sm0.2Ce0.8O1.9（SDC）发生反应，表明这种电解质材料具有良好的高温化学相容性。电导率测试结果表明Bi的掺入显著提高了材料电导率。程序升温脱附测试结果表明，铋的掺杂显著增强了材料的表面氧吸附能力。不同氧分压下的交流阻抗谱测试结果表明，La1.9Bi0.1CuO4阴极在700℃空气中的极化电阻为0.26 Ω·cm2，以电解质SDC支撑的单电池NiO-SDC/SDC/La1.90Bi0.10O4在700℃的最大输出功率密度为308 mW·cm-2，电极反应的速控步骤为氧分子的扩散与表面吸附过程。 |
| 关键词: 固体氧化物燃料电池 La2-xBixCuO4电极材料 电极反应 |
| 基金项目: 国家自然科学基金（No.51872078）和黑龙江省自然科学基金（No.LH2020E105）资助。 |
| Abstract: The cathode material La2-xBixCuO4 (x=0, 0.05, 0.10) for solid oxide fuel cell was synthesized by glycinenitrate method. The phase of the material was analyzed by X-ray diffraction (XRD) method. The results show that the material crystallizes in peroskite-type single phase oxide. Due to the increase doping amount of bismuth, the space group of the material changes from Fmmm to I4/mmm. The unit cell volume increases with the doping amount of bismuth. La2-xBixCuO4 cathode materials were found to show no chemical reaction with the electrolyte Sm0.2Ce0.8O1.9 (SDC) at 950℃ for 24 h, indicating the good chemical compatibility of La2-xBixCuO4 with SDC material. The bismuth doping significantly increased the electrical conductivity of the material. The highest conductivity reached 90.3 S·cm-1 at 350℃ for La1.9Bi0.1CuO4. The temperature programmed desorption (TPD) measurement proves that bismuth doping promotes the surface oxygen absorption ability of La2-xBixCuO4 material, and La1.9Bi0.1CuO4 shows the largest amount of oxygen vacancies among the Bi-doped materials. The electrochemical properties of La2-xBixCuO4 cathode materials were further studied by AC impedance spectroscopy under different oxygen partial pressures. The polarization resistance of La1.9Bi0.1CuO4 was 0.26 Ω·cm2 at 700℃ in air. The peak power density (PPD) at 700℃ was 308 mW·cm-2 for the SDC electrolyte supported single cell NiO-SDC/SDC/La1.90Bi0.10CuO4. The reaction rate limiting step is identified to be a mixed step involving the gas oxygen diffusion through the porous cathode and the surface adsorption process. |
| Keywords: solid oxide fuel cell La2-xBixCuO4 electrode material electrode reaction |
| 投稿时间：2021-06-15 修订日期：2021-10-05 |
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| 庞姝彤,赵辉.La2-xBixCuO4阴极材料的合成与电化学性质[J].无机化学学报,2021,37(12):2185-2192. |
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