用Mn合的Ba0.5Sr0.5FeO3-δ矿氧化物的结合状态和热膨胀系数用于IT-SOFCs
Taeheun Lim1, Sung-Sin Yun1,2, Kanghee Jo1
1School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea.
Nanomaterials (Basel, Switzerland)
|January 11, 2024
概括
在Ba0.5Sr0.5Fe1-xMnxO3-δ (BSFMnx) 阴极材料中合可以减少氧气空缺并提高热稳定性. 这提高了电导率和热膨胀兼容性与Ce0.8Sm0.2O2 (SDC).
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 固氧化物燃料电池 固氧化物燃料电池
背景情况:
- Ba0.5Sr0.5Fe1-xMnxO3-δ (BSFMnx) 是固体氧化物燃料电池 (SOFC) 的有希望的阴极材料.
- 了解氧气空隙形成和热电化学特性对于优化SOFC性能至关重要.
研究的目的:
- 研究 (Mn) 兴奋剂对BSFMnx阴极材料氧空位形成,电化学和热性能的影响.
- 为了评估Mn-doped BSFMnx与Ce0.8Sm0.2O2 (SDC) 电解质的性能和稳定性.
主要方法:
- 热重力测量分析 (TGA) 用于确定氧气损失.
- 射线光电子光谱 (XPS) 用于分析氧化状态和结合能.
- 测量电导率作为温度的函数.
- 区域特定电阻 (ASR) 的测量.
- 热膨胀系数 (TEC) 的测量.
主要成果:
- 胺兴奋剂通过加强金属与氧的结合,减少了氧气损失和减少了氧气空缺.
- 电导率随着胺的使用而增加,在450°C时达到10.4 S cm-1的BSFMn0.15.
- 面积特异性电阻在700°C时为BSFMn0.15.15的0.14 Ω cm2.
- 热膨胀系数降低了Mn兴奋剂,显示了与SDC (12.7 × 10-6 K-1) 的良好的兼容性.
结论:
- 在BSFMnx中胺增强了电导率和热稳定性.
- 减少氧气空缺和改进的热膨胀兼容性使Mn-doped BSFMnx适用于使用SDC电解质的SOFC应用.
- 虽然Mn兴奋剂稍微降低了氧降解反应活性,但导电性和稳定性的整体改善是显著的.
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