| 稳定的高活性PrBa0.5Sr0.5Fe1.6Ni0.4O5+δ阴极材料的电化学性能 |
| Electrochemical properties of stable and highly active PrBa0.5Sr0.5Fe1.6Ni0.4O5+δ cathode material |
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| 摘要: 通过Sr、Ni共掺杂PrBaFe2O5+δ(PBF)制备了中温固体氧化物燃料电池PrBa0.5Sr0.5Fe1.6Ni0.4O5+δ(PBSFN)阴极，并对其性能进行测试。X射线衍射(XRD)图表明，高温煅烧的PBSFN阴极形成了立方钙钛矿结构。在950℃下，混合共烧的PBSFN阴极与La0.9Sr0.1Ga0.83Mg0.17O3-δ(LSGM)电解质表现出良好的化学兼容性。350℃时，在空气气氛下，PBSFN电极材料的电导率最大，其值为681 S·cm-1。800℃时，在空气气氛下，PBSFN阴极在LSGM电解质上的极化阻抗为0.033 Ω·cm2。Sr、Ni掺杂PBSFN阴极的高频阻抗(R1)仅为低频阻抗(R2)的6.4%，表明Sr、Ni掺杂PBSFN提高了阴极的电荷转移效率。此外，该阻抗特性与密度泛函理论计算的PBSFN氧空位形成能结论一致。800℃时，以H2为燃料测试的单电池的最大功率密度为647 mW·cm-2。特别地，采用PBSFN为阴极的单电池在100 h内保持了良好的功率稳定性。 |
| 关键词: 固体氧化物燃料电池 铁基阴极 电导率 |
| 基金项目: 国家自然科学基金(No.52202249)和辽宁科技大学研究生科技创新项目(No.LKDYC202428)资助。 |
| Abstract: Sr, Ni co-doped PrBaFe2O5+δ (PBF) was employed to prepare the PrBa0.5Sr0.5Fe1.6Ni0.4O5+δ (PBSFN) cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs), and the performance of cathode was evaluated. X-ray diffraction (XRD) analysis revealed that the PBSFN cathode formed a cubic perovskite structure after being calcined at high temperatures. PBSFN cathode and La0.9Sr0.1Ga0.83Mg0.17O3-δ (LSGM) electrolyte exhibited good chemical compatibility after being co-calcined at 950 ℃. In an air atmosphere, the conductivity of the PBSFN cathode reached a maximum value of 681 S·cm-1 at 350 ℃. At 800 ℃, the polarization resistance of the PBSFN cathode on the LSGM electrolyte was 0.033 Ω·cm2 in an air atmosphere. The high-frequency resistance (R1) is only 6.4% more than that of low-frequency resistance (R2), indicating Sr, Ni doped significantly improves the efficiency of charge transfer. The polarization resistance (Rp) result is consistent with the oxygen vacancy formation energy of PBSFN by density function theory calculations. At 800 ℃, using H2 as the fuel, the maximum power density of the single cell reached 647 mW·cm-2. In particular, the output power of the single cell with the PBSFN cathode maintained good stability over 100 h. |
| Keywords: solid oxide fuel cell iroN-based cathode conductivity |
| 投稿时间：2024-11-05 修订日期：2025-03-04 |
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| 宋如,王彪,卢春玲,牛冰冰,邱东超.稳定的高活性PrBa0.5Sr0.5Fe1.6Ni0.4O5+δ阴极材料的电化学性能[J].无机化学学报,2025,41(4):639-649. |
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