用添加Fe-N-C的双重功能协同作用:增强位点密度和内在活性
Jinjing Tao1,2, Xin Guan1,2, Xiaolong Yang1,2
1State Key Laboratory of Electroanalytic Chemistry, Jilin Province Key Laboratory of Low Carbon Chemistry Power, Jilin Provincial Science and Technology Innovation Center of Hydrogen Energy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 China mlxiao@ciac.ac.cn liuchp@ciac.ac.cn xingwei@ciac.ac.cn.
Chemical science
|September 15, 2025
概括
一个新的合成策略增强了氧降解反应 (ORR) 的金属--碳 (M-N-C) 催化剂. 这提高了活性位点的密度和内在活动,提高了燃料电池的性能.
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:
- 原子分散的过渡金属,共碳 (M-N-C) 催化剂是氧减氧反应 (ORR) 的有希望的替代品.
- 目前的M-N-C催化剂具有低的内在活性和不足的活性位密度,这限制了它们的实际应用.
研究的目的:
- 开发一种合成策略,以提高M-N-C催化剂的活性位点密度和内在活性.
- 调查兴奋剂对铁基M-N-C催化剂ORR性能的影响.
主要方法:
- 采用酸 (NaBH4) 辅助合成策略,制造化铁碳 (Fe-sZ8-N-C) 催化剂.
- 密度函数理论 (DFT) 的计算被用来阐明对ORR路径和中间吸附的影响机制.
主要成果:
- Fe-sZ8-N-C催化剂的活性位点密度高,为每克2.26 × 10^20位点,与传统Fe-N-C相比增加了两倍.
- 催化剂的内在活性从每秒每位点0.96e提高到每秒每位点1.5e.
- DFT的计算表明,兴奋剂改变了协调结构,促进了直接的O2裂变并削弱了中间吸附.
结论:
- NaBH4辅助合成有效地提高了M-N-C催化剂的活性位点密度和内在活性.
- 优化的Fe-sZ8-N-C催化剂在质子交换膜燃料电池 (PEMFC) 中实现了1.3W cm^-2的峰值功率密度.
- 这项工作展示了改性M-N-C催化剂在高效的燃料电池应用中的潜力.
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