解开单Fe原子站点的动态低旋转状态演变,以实现高效的CO2电减
Yaqiong Zeng1,2, Jian Zhao3, Shifu Wang1,4
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of the American Chemical Society
|November 10, 2025
概括
研究人员在碳纳米管上开发了一种新的单原子铁催化剂,用于高效的电化学二氧化碳减排 (CO2RR). 这种催化剂通过利用旋转驱动机制显著提高了CO2RR性能,从而实现了高效率和高周转频率.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 定制单原子催化剂的电子结构对于提高反应性和理解催化反应机制至关重要.
- 电化学二氧化碳减排 (CO2RR) 是可持续能源和化学生产的关键过程,但需要有效的催化剂.
研究的目的:
- 设计和合成具有精确控制电子结构的新型单原子铁催化剂,以提高CO2RR性能.
- 阐明CO2RR增强的催化活性背后的旋转驱动机制.
主要方法:
- 碳纳米管上的氧桥单原子位点的共价构造.
- 电化学表征包括法拉第效率和周转频率测量.
- 使用光谱技术 (莫斯巴尔,X射线吸收,拉曼,ATR-SEIRAS) 和密度函数理论 (DFT) 的计算.
主要成果:
- 合成的催化剂以低旋转Fe (III) 位主导,达到99%的最大CO法拉达效率和5.3×10^4h^-1的旋转频率.
- 与高旋转Fe (III) 位相比,观察到性能显著增加了20倍.
- 运行研究发现了一个旋转驱动的机制,涉及在不同超电位下在现场生成的高旋转Fe (II) 和低旋转Fe (II) 位主导CO2RR.
- 光谱和DFT结果显示,减少的酸连接物减弱了LS O-Fe (II) Pc- 位点的* CO结合,从而促进了CO2RR.
结论:
- 碳纳米管上的共价氧桥接单个Fe原子位点是电化学CO2RR的高效催化剂.
- 催化剂的性能是由涉及特定铁氧化状态和连接体相互作用的自旋依赖机制驱动的.
- 精确控制单原子催化剂的电子结构是提高催化性能和理解反应途径的可行策略.
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