通过整合Mo2C集群来提高Fe-N-C燃料电池催化剂的性能和耐用性
Liming Guo1,2, Xin Wan2, Xiaofang Liu2
1Tianmushan Laboratory, Hangzhou, 311115, China.
Small methods
|October 18, 2024
概括
将Mo2C集群与铁单原子催化剂集成,显著提高了氧气还原反应活性和燃料电池的稳定性. 这一进步为高效的能源转换提供了一个有前途的无替代品.
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:
- 碳支持的协调铁单原子 (Fe-N-C) 催化剂是质子交换膜燃料电池 (PEMFC) 中氧降解反应 (ORR) 的关键白金组无金属替代品.
- 目前的Fe-N-C催化剂面临着有限的内在活性和稳定性的挑战,阻碍了它们的广泛应用.
- 开发先进的催化剂对于提高PEMFC的效率和耐用性至关重要.
研究的目的:
- 通过整合Mo2C集群来增强Fe-N-C催化剂的ORR活性和稳定性.
- 研究单个Fe原子和Mo2C集群对催化性能的协同效应.
- 为能源应用提供关于单原子/纳米聚合物混合催化剂合理设计的见解.
主要方法:
- 一种由Fe单个原子和Mo2C集群共同嵌入在添加碳 (FeSA/Mo2C-NC) 上的复合催化剂的合成.
- 在酸性介质中评估ORR活性的电化学表征.
- 在H2-空气PEMFC中进行性能测试,以确定功率密度和长期稳定性.
- 理论计算以阐明底层机制.
主要成果:
- FeSA/Mo2C-NC复合催化剂在酸性介质中表现出极好的ORR活性,半波潜力为0.82V.
- 在H2-空气PEMFC中实现了0.5W cm-2的高峰功率密度.
- 催化剂表现出了显著的稳定性,在80小时的0.4V运行中,衰变是可以忽略的.
- 基酸前体蚀刻优化了孔隙结构,暴露了更多的活性部位.
- Mo2C集群调节了Fe-N4位点的电子结构,增强了中间吸附和Fe-N键强度.
结论:
- 集成Mo2C集群有效地提高了ORR的Fe-N-C催化剂的活性和稳定性.
- 单个Fe原子和Mo2C集群之间的协同效应对于提高催化性能至关重要.
- 这项研究为PEMFC和其他能量转换系统设计先进,稳定和高度活跃的单原子催化剂提供了可行的策略.
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