开放孔隙结构的金属-有机框架的选择性蚀刻:燃料电池的增强氧降解反应的质量效率催化剂
Jingjing Li1,2, Wei Xia3, Xingtao Xu4
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Journal of the American Chemical Society
|December 10, 2023
概括
本研究引入了一种开孔金属有机框架 (MOF) 催化剂,以提高燃料电池中的氧降解反应 (ORR) 活性. 这种新的结构增强了氧气的运输, 提高了性能和稳定性,
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 单原子Fe-N-C催化剂对氧降解反应 (ORR) 有希望.
- 金属有机框架 (MOF) 中厚厚的催化剂层和狭窄的孔隙限制了燃料电池中的质量转移和氧气供应.
- 质子交换膜燃料电池 (PEMFC) 需要具有良好质量传输的高效催化剂.
研究的目的:
- 在燃料电池中开发具有开放孔结构的催化剂.
- 提高Fe-N-C催化剂的氧降解反应 (ORR) 活性和稳定性.
- 研究MOF孔隙结构对催化剂性能的影响.
主要方法:
- 化辅助的选择性蚀刻以创建开放孔的MOF.
- 在N,S共碳框架 (OP-Fe-NC) 上固定原子分散的Fe原子.
- 用于分析膜电极组件 (MEA) 中的氧气传输电阻的有限元模拟.
主要成果:
- OP-Fe-NC催化剂具有开放孔结构,降低了氧气运输阻力.
- 在酸性电解质中达到0.89V的半波电位,超过Pt/C20mV.
- 在MEA中,在0.9V时显示出高电流密度29 mA cm-2,表明ORR活动和稳定性优越.
结论:
- 开发的开放孔结构战略有效地增强了质量运输和催化活动.
- 具有最佳孔隙结构的原子精度Fe-N-C催化剂对于高性能能量转换装置至关重要.
- 这种方法为制造燃料电池和其他能源应用的先进电催化剂提供了途径.
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