在空缺缺陷的化工程重新平衡FeN4活跃地点的电荷分配
Xuebi Rao1, Jialin Sun1, Liqun Liu1
1Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai 200444, China.
Journal of colloid and interface science
|October 17, 2025
概括
铁碳催化剂的兴奋剂通过优化FeN4活性位点来增强氧降解反应 (ORR) 活性. 这一策略改善了电子结构,提高了空气电池的性能.
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:
- 铁--碳 (Fe-N-C) 催化剂对氧降解反应 (ORR) 是有前途的.
- 调节FeN4活性位点的电子结构是增强催化剂活性的关键.
- 在异质原子兴奋剂策略和对FeN4位点的机制理解方面仍然存在挑战.
研究的目的:
- 研究 (I) 兴奋剂对FeN4活性位点电子结构的影响.
- 探索I-doping调节ORR的催化活性的机制.
- 为提高Fe-N-C催化剂性能制定有效的战略.
主要方法:
- 化工程方法来制造Fe和I联合化含N的碳框架 (Fe-N-I/CF) 催化剂.
- 分析电子结构修改的光谱表征.
- 理论计算以了解I-doping的监管机制.
主要成果:
- 在FeN4站点附近的战略I-doping重新平衡了局部电荷分布,并降低了率决定步骤的自由能量障碍.
- I-doping诱导Fe d频段中心的下移,增强ORR电催化性能.
- 优化的Fe-N-I/CF催化剂实现了0.937V (与RHE相比) 的高半波潜力和出色的稳定性.
结论:
- 化工程是一种有效的策略,可以调节Fe-N-C催化剂中的FeN4活性位点的电子结构.
- 优化的Fe-N-I/CF催化剂表现出卓越的ORR活性和稳定性,适用于空气电池.
- 这项工作为先进的电催化剂设计提供了对异构原子兴奋剂的机制性见解.
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