主组单原子易斯酸站点:对于性氧化反应的CO-耐受性增强剂
Yang Yang1, Jiahe Yang1, Peng Jiang1
1Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026, P.R. China.
Angewandte Chemie (International ed. in English)
|March 7, 2026
概括
这项研究引入了一种新型催化剂,可以提高离子交换膜燃料电池中的CO耐受性. 新的Ru/Mg催化剂有效地减轻了CO中毒,提高了氧化反应性能和燃料电池效率.
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:
- 一氧化碳 (CO) 中毒是用于氧化反应 (HOR) 的贵金属电催化剂的主要挑战.
- 这种CO不耐受性限制了离子交换膜燃料电池 (AEMFC) 的效率和应用.
研究的目的:
- 为AEMFCs开发一种耐碳的HOR电催化剂.
- 通过减轻CO中毒,提高基于的催化剂的稳定性和性能.
主要方法:
- 使用单个原子 (Mgs) 固定在碳基板上的路易斯酸位点的构建.
- 在Mgs/C.的支持下合成超小的纳米粒子 (Ru).
- 燃料电池中的电化学测试和现场红外光谱学.
- 理论计算以阐明CO氧化和催化剂相互作用的机制.
主要成果:
- Ru/Mgs/C催化剂表现出极好的CO耐受性和高HOR活性.
- 由于单个Mg原子的定作用,材料的结构稳定性得到维持.
- 燃料电池测试显示可回收性能 (90%的初始活性) 和高特异功率密度 (4.11W mg-1).
- 超低贵金属负载 (0.125毫克-2毫克) 实现了具有竞争力的性能.
结论:
- 单个Mg原子作为易斯酸位,通过易斯酸相互作用促进CO电氧化.
- 这种机制显著增强了HOR活性和对CO中毒的抵抗力.
- 开发的催化剂为高效和耐用的AEMFC提供了一个有前途的解决方案,减少了贵金属的利用.
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