通过Mg调节的Fe-N4Pyridinic转换打破ORR权衡
Si-Qi Sun1, Ya-Peng Cheng2,3, Hai-Ning Zhang1,4
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|February 4, 2026
概括
这项研究引入了一种新的Mg辅助策略,用于稳定氧降解反应 (ORR) 的铁基电催化剂. 增强的催化剂表现出卓越的活性和耐用性,性能优于传统材料.
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:
- 由氧 (Fe-Npyrr-C) 协调的单原子Fe位点显示出氧降解反应 (ORR) 的高活性.
- 这些Fe-Npyrr-C催化剂容易通过脱金属化去活化,这限制了它们的实际应用.
- 开发稳定和活跃的ORR电催化剂对于燃料电池和金属空气电池等能源转换技术至关重要.
研究的目的:
- 为了克服Fe-Npyrr-C催化剂的脱金属化诱导的失活.
- 为了提高单原子铁电催化剂的活性和耐用性.
- 开发Fe-N-C电催化剂的总体协调工程战略.
主要方法:
- 采用了Mg辅助的牺牲模板策略.
- 实现了Fe-N4协调的精确重建.
- 诱导了pyrrolic-N部分转化为pyridinic-N配体的过程.
主要成果:
- 由此产生的Fe(Mg) -N-C(1) 催化剂呈现出0.91V的异常ORR半波电位 (E1/2).
- 催化剂表现出了出色的耐用性,在55小时后保留了95.2%的初始电流.
- 在高峰功率密度为271mWcm的Zn-空气电池中,稳定运行超过530小时.
结论:
- 丰富pyridinic-N-协调Fe-N4位点可以增强ORR活动并抑制脱金属化.
- 辅助策略有效地统一了Fe-N-C电催化剂的活性和稳定性.
- 这种方法为为能源应用设计下一代电催化剂提供了一个有希望的途径.
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