减轻与三相接口相对的Fe单位位的错位,以实现高性能燃料电池
Weiyi Zhao1,2, Haotian Zhang3,4, Shuai Yang1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|February 3, 2026
概括
具有定制水友性的层次多孔Fe─N─C催化剂增强了质子交换膜燃料电池的性能. 这种设计优化了单原子催化剂的可访问性和质量运输,提高了效率和耐用性.
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:
- 像Fe─N─C这样的单原子催化剂 (SAC) 是在质子交换膜燃料电池 (PEMFC) 中替代的有希望的替代品.
- 由于三相接口 (TPI) 的可访问性不佳,原子效率低,这阻碍了真实电池中的SAC性能.
- 优化催化剂层结构以增强反应剂可访问的单个位点对于在PEMFC中推进SAC至关重要.
研究的目的:
- 设计一种催化剂层结构,以增加PEMFC中Fe─N─C SACs反应剂可访问单个位点的密度.
- 调查层次性多孔性和调整表面水友性在激活TPI中的作用.
- 为了提高使用Fe─N─C SACs的PEMFCs的整体性能和耐用性.
主要方法:
- 制造具有受控表面水友性的等级多孔Fe─N─C催化剂.
- 粗粒度分子动力学 (MD) 模拟以建模催化剂层结构和离子运输.
- 组合光谱技术以确认质量转移通道的形成.
主要成果:
- 巨孔和调节的水友性作为"开关",促进Nafion/水域的透,并缓解O2和H3的运输瓶.
- 工程结构创造了连续的质量转移道,使Fe站点利用率提高了80%.
- 在6万次加速压力测试 (AST) 后,达到1581mWcm-2的峰值功率密度 (Pmax),并保持63%的性能.
结论:
- 通过层次的多孔性和表面化学来实现量身定制的催化剂层结构,有效地激活PEMFC中的TPI.
- 这种方法显著提高了单原子催化剂的利用效率和耐用性.
- 建立了一个设计规则,将孔层次和表面化学与TPI激活联系起来,以提高燃料电池性能.
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