表面氧气空缺调节策略增强了固氧燃料电池中CoFe2O4阴极的电化学催化活性
Zhe Zhang1, Chuangang Yao1, Haixia Zhang1
1College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China.
Journal of colloid and interface science
|November 21, 2024
概括
研究人员开发了一种方法,使用玻利化物增加固氧燃料电池 (SOFC) 阴极中的氧气空缺. 这种优化显著提高了阴极性能,显示了先进催化材料的潜力.
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
- 催化剂是一种催化剂.
背景情况:
- 氧气空缺对于固态材料中高效的氧离子运输至关重要.
- 固体氧化物燃料电池 (SOFC) 的性能通常受阴极动力学限制.
- 控制表面氧空隙度是提高SOFC阴极活动的关键.
研究的目的:
- 开发一种方法来精确控制铁氧氧化物 (CoFe2O4,CFO) 阴极中的表面氧空度.
- 研究表面氧气空缺对SOFC阴极的电化学性能的影响.
- 为了优化治疗持续时间,最大限度地提高阴极催化活性.
主要方法:
- 使用化 (NaBH4) 溶液从CFO阴极表面捕获网状氧气.
- 调节的NaBH4处理持续时间,以控制表面氧空度和过渡金属离子价值状态.
- 处理的CFO材料的电化学催化活性和性能特征.
主要成果:
- 经过10分钟处理的CFO-10样本显示出最佳的电化学催化活性.
- 在CFO-10中观察到增强的氧吸附解离和电荷转移过程.
- 在750°C时,CFO-10的极化阻力 (Rp) 为0.032 Ω cm2,与未经处理的CFO相比减少了42.8%.
- CFO-10的峰值功率密度 (PPD) 为923 mW·cm-2,比未经处理的CFO增加了78.5%.
结论:
- 通过NaBH4处理进行表面氧空缺工程是提高SOFC阴极性能的有效策略.
- 在CFO阴极中优化氧空位度导致电化学活性和功率密度的显著改善.
- 这种方法为开发用于能源应用的先进催化材料提供了一个有希望的途径.
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