孔结构工程通过硬模板合成:解锁Fe-N@C电催化剂的高氧降解反应活性和稳定性
Giulia Gianola1,2, Mirtha A O Lourenço3, Luca Basile1,3
1Department of Applied Science and Technology (DISAT), Politecnico di Torino, Turin, Italy. juqin.zeng@polito.it.
Nanoscale horizons
|June 26, 2025
概括
使用模板调整铁碳 (Fe-N@C) 电催化剂的孔结构,优化燃料电池的氧降解反应 (ORR) 性能. 半孔Fe-N@C材料表现出增强的活性和耐久性,对于非贵金属催化剂至关重要.
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:
- 开发高效且耐用的电催化剂对于推进燃料电池技术至关重要.
- 铁--碳 (Fe-N@C) 材料是氧降解反应 (ORR) 的非贵金属催化剂.
- 优化Fe-N@C催化剂的孔隙结构对于提高其活性和耐用性至关重要.
研究的目的:
- 研究使用各种基架 (SBA-15,KIT-6,双SBA-15/KIT-6) 的硬模板对Fe-N@C电催化剂孔结构的影响.
- 为了将量身定制的孔隙结构与ORR的电催化性能相关联.
- 评估工程Fe-N@C催化剂的长期稳定性和反应路径选择性.
主要方法:
- 使用SBA-15,KIT-6和双SBA-15/KIT-6模板的硬模板合成Fe-N@C电催化剂.
- 合成材料的孔隙结构,表面积和孔隙体积的表征.
- 在性和酸性介质中对ORR活性,耐久性和选择性的电化学评估.
主要成果:
- 半孔Fe-N@CMK-3 (SBA-15衍生) 由于氧气扩散的最佳孔隙结构,表现出最高的ORR活性 (0.99VRHE性,0.82VRHE酸性).
- 微孔Fe-N@CMK-8 (KIT-6衍生) 由于氧气可获得性有限,其活性较低.
- 双模板Fe-N@CMK-3/8提供了平衡的性能,而Fe-N@CMK-3在性介质中表现出卓越的稳定性,Fe-N@CMK-3/8在选择性方面表现出色,维持了4e路径.
结论:
- 通过硬模板孔工程是一种有效的策略,用于为特定的燃料电池应用量身定制Fe-N@C电催化剂.
- 孔隙结构显著影响活跃站点的可访问性和ORR机制.
- 这些发现有助于开发用于质子交换膜和性燃料电池的高性能非贵金属催化剂.
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