通过旋转操纵定制Fe-N-C催化剂的氧降解反应动力学,以实现高效的空气电池
Huiwen Zhang1, Hsiao-Chien Chen2, Solmaz Feizpoor1
1School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|April 9, 2024
概括
引入Fe原子集群可增强氧降解反应 (ORR) 的铁--碳催化剂. 这种旋转操纵可以提高酸性和性溶液中的催化剂活性,从而提高气电池的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧降解反应 (ORR) 的动力学受金属-体轨道相互作用的影响.
- 原子分散的Fe-N-C催化剂对ORR有希望,但需要增强活动.
研究的目的:
- 通过引入Fe原子集群来提高Fe-N-C催化剂的ORR活性.
- 通过旋转状态操纵来研究ORR活动增强背后的机制.
主要方法:
- 合成Fe-N-C催化剂与附近的Fe原子集群.
- 在酸性和性介质中进行电化学测试.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 催化剂呈现出高ORR半波潜力 (0.78V酸性,0.90V性).
- 在可充电Zn-空气电池中展示了出色的性能.
- DFT的计算揭示了Fe位点从低旋转转向中旋转的旋转状态过渡,有利于OH-脱吸.
结论:
- 植入Fe原子集群有效地通过旋转状态操纵增强Fe-N-C催化剂ORR活性.
- 这一战略为设计高性能单原子催化剂提供了一条途径.
- 这些发现为优化能量转换装置的催化剂提供了洞察力.
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