在Fe-N-C单原子催化剂中配合和B的辅助作用对提高氧降解反应性能产生了补充作用
Jiansheng Liu1, Lili Cao1, Haoran Ma1
1Inner Mongolia Key Laboratory of Rare Earth Catalysis, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China. chaizhanli@imu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|July 7, 2025
概括
这项研究引入了一种新型的和联合的铁--碳单原子催化剂 (SAC),可显著提高氧降解反应 (ORR) 在性电解质中的性能和耐用性.
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:
- 电催化剂中的兴奋剂提供可调节的电子结构和灵活的活性位点,以改善催化反应.
- 在联合兴奋剂催化剂的性能提升背后的精确机制仍然是一个活跃的研究领域.
- 铁--碳 (Fe-N-C) 单原子催化剂 (SAC) 对各种催化应用具有前景.
研究的目的:
- 合成和表征一种与 (Mn) 和 (B) 联合合的独特Fe-N-C SAC.
- 在性电解质中研究联合化催化剂的氧降解反应 (ORR) 性能.
- 阐明结构-活性关系以及Mn和B联合兴奋剂在增强ORR活性和稳定性的作用.
主要方法:
- 合成Fe-N-C SACs与Mn和B的协同兴奋剂.
- 电化学表征包括循环电压测量,旋转磁盘电极测量和耐用性测试.
- 分析结构-活动关系,以了解联合兴奋剂对活性场所和电子结构的影响.
主要成果:
- 和B联合合的Fe-N-C SAC表现出优异的ORR性能,由高半波电位 (0.85V),低Tafel斜率 (61.79 mV dec-1),高动力电流密度 (3.4 mA cm-2) 证明.
- 与Fe-NC和Fe-BNC催化剂相比,辅助催化剂的耐用性明显更好.
- 合兴奋剂有效地弥补了由B兴奋剂引入的结构扭曲和性能缺陷,例如减少M-N活性位点和低导电性.
结论:
- 在Fe-N-C SAC中使用Mn和B的联合兴奋剂策略在提高ORR性能和稳定性方面非常有效.
- 在减轻B兴奋剂的负面影响方面发挥着至关重要的作用,从而优化活性位点和改善催化动力学.
- 这项工作突出了金属和非金属联合合的Fe-N-C SACs作为可持续能源应用的先进电催化剂的潜力,特别是ORR.
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