一个由微量化离子增强的Fe-NC电催化剂,在质子交换膜燃料电池中具有高性能
Shuhu Yin1, Long Chen1, Jian Yang2
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Engineering Research Center of Electrochemical Technologies of Ministry of Education, College of Chemistry and Chemical Engineering, and Discipline of Intelligent Instrument and Equipment, Xiamen University, Xiamen, P. R. China.
Nature communications
|August 29, 2024
概括
我们开发了一种卓越的铁--碳催化剂,用于质子交换膜燃料电池. 这种金属--碳催化剂提供了增强的活性和功率密度,取代了昂贵的替代品.
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:
- 是一种昂贵而罕见的金属,用于质子交换膜燃料电池.
- 金属--碳 (M-N-C) 催化剂正在被探索为替代品,但通常显示较低的活动.
- 氧降解反应 (ORR) 对燃料电池效率至关重要.
研究的目的:
- 为ORR开发一种高度活性的铁--碳 (Fe-N-C) 催化剂.
- 优化碳结构和Fe-N4协调部位,以提高性能.
- 为了研究表面修饰和缺陷在催化剂活性中的作用.
主要方法:
- 合成Fe-N-C催化剂使用化和化的高温处理.
- 优化了碳框架缺陷和中等度.
- 分析了Fe-N4站点的协调环境.
- 在80°C的H2-O2燃料电池中评估了催化剂性能.
主要成果:
- 实现了Fe-N4位点的高内在活性和密度.
- 引入了碳缺陷,微量离子和半孔孔.
- 证明了改善的离子体-催化剂相互作用和离子体透.
- 在三相边界观察到增强的O2运输和电荷转移.
- 在0.9无ViR的情况下达到1.86Wcm-2和54mAcm-2的峰值功率密度.
结论:
- 开发的Fe-N-C催化剂对ORR表现出极好的活性,与基催化剂相比.
- 表面离子和优化的碳结构在提高催化剂性能方面发挥着至关重要的作用.
- 接口微环境调节是推动燃料电池M-N-C催化剂技术发展的关键.
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