机械研究 (La,Sr) ((Co,Fe) O3-δ的腐蚀由CO2诱导的阴极
Na Xu1,2, Shijiao Zhang1, Qiongyu Zhou3
1Key Laboratory of Preparation and Application of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun 130103, China.
Molecules (Basel, Switzerland)
|November 25, 2023
概括
固体氧化物燃料电池阴极随着二氧化碳暴露而降解,但当清洁空气恢复时,性能会恢复. (La,Sr) 和 (Co,Fe) O3-δ 阴极对二氧化碳引起的腐蚀有很好的抵抗力.
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
- 能源转换 能源转换
背景情况:
- 固体氧化物燃料电池 (SOFC) 对于清洁能源至关重要,但它们的性能受到环境空气中二氧化碳污染的影响.
- SOFCs的阴极对二氧化碳特别脆弱,导致降解和效率降低.
研究的目的:
- 为了研究二氧化碳对三种 (La,Sr) ((Co,Fe) O3-δ SOFC阴极变体的性能和耐用性的影响.
- 在不同的二氧化碳度和温度下分析这些正极的电化学过程和耐腐蚀性.
主要方法:
- 电化学阻抗光谱 (EIS) 与放松时间分布 (DRT) 分析.
- 在耐久性测试期间在650°C和800°C处暴露于高度的二氧化碳.
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 进行暴露后分析.
主要成果:
- 所有三个 (La,Sr) ((Co,Fe) O3-δ阴极变体 (LSCF-6428,LSCF-4628,LSCFN-46271) 在暴露于CO2时都显示出性能降低.
- 使用CO2观察到电极极化阻力增加,但在纯空气中性能完全恢复.
- XRD和SEM证实,二氧化碳暴露不会对阴极造成永久性结构损伤.
结论:
- (La,Sr) ((Co,Fe) O3-δ阴极对二氧化碳诱导的降解具有显著的弹性.
- 由于CO2的暂时性能损失是可逆的,这表明它适合在环境条件下运行的SOFC应用.
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