旋转调节的Fe-N-C催化剂通过调整协调物种来实现强大的氧降低
Ning Wang1, Chao Meng1, Bin Wang1
1State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
National science review
|June 13, 2025
概括
在铁碳催化剂中,将石墨 (NGC) 与Fe-N4位点相邻,优化了铁的旋转状态,显著提高了氧减少反应 (ORR) 的性能和耐用性.
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:
- 铁--碳 (Fe-N-C) 催化剂是氧降解反应 (ORR) 的替代品.
- 传统的Fe-N4活性部位通常表现出低旋转的配置,导致强烈的氧介质吸附和限制ORR效率.
- 优化活性站点的电子结构对于提高催化剂性能至关重要.
研究的目的:
- 为了研究邻近的石墨 (NGC) 对Fe-N4位点在Fe-N-C催化剂中的旋转状态的影响.
- 开发一种具有成本效益的方法,用于制备具有调制自旋状态的Fe-N-C催化剂,以改善ORR活动.
- 评估这些优化的催化剂在电化学应用中的性能,包括Zn-空气电池.
主要方法:
- 理论计算以阐明NGC对Fe旋转状态和氧介质结合的影响.
- 合成Fe-N-C催化剂使用电和受控的热和廉价的前体.
- 使用旋转磁盘电极 (RDE) 电压测量的ORR活动和耐用性的电化学表征.
- 在 Zn-空气电池 (ZAB) 和准固体 ZAB 的性能评估.
- 在现场表征技术,以确认旋转状态促进的性能提升.
主要成果:
- 邻的NGC有效调节Fe位点的自旋状态,促进电子转移和优化氧中间体脱吸.
- 与基准Pt/C相比,合成的Fe-N-C催化剂表现出更高的ORR活性.
- 催化剂表现出极好的耐用性,在10,000个周期内电压衰变最小.
- 优化的催化剂在气电池中达到225 mW cm-2的峰值功率密度.
- 带有催化剂的准固体ZAB在曲条件下表现出强大的性能,为电子设备提供动力.
结论:
- 通过相邻的NGC调节Fe旋转状态是提高Fe-N-C催化剂ORR性能的有效策略.
- 开发的Fe-N-C催化剂为ORR和储能应用提供了具有成本效益和高性能的替代方案.
- 这些发现为设计可穿戴电子产品和其他能源设备的先进电催化剂提供了途径.
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