双封闭设计,以访问燃料电池的高度稳定的金属间纳米粒子
Lin Tian1,2, Xiaoping Gao1,3, Mengzhao Zhu1
1Department of Endocrinology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China.
Advanced materials (Deerfield Beach, Fla.)
|February 17, 2025
概括
这项研究引入了一种双封闭策略,以提高质子交换膜燃料电池 (PEMFC) 中的-催化剂的耐用性. 新的设计显著提高了催化剂的稳定性,而不会影响性能.
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:
- 质子交换膜燃料电池 (PEMFC) 需要高度稳定的低 (Pt) 催化剂来长时间运行.
- 保持催化剂稳定性,特别是金属间纳米粒子,是PEMFC技术的一个重大挑战.
研究的目的:
- 开发一种新的双封闭设计,以提高PEMFCs的金属间纳米颗粒的稳定性.
- 保持高的催化活性,同时提高基于Pt的催化剂的耐用性.
主要方法:
- 采用了一种涉及碳和Pt-skin形成的双重封闭策略.
- 在炼过程中引入了氧气 (O2),以蚀刻碳外并诱导表面过渡金属分离.
- 该策略用于合成双封闭的Pt1Co1,Pt1Fe1和Pt1Cu1金属间纳米粒子.
主要成果:
- 双封闭的Pt1Co1催化剂表现出极好的质量活性 (1.45 A mgPt-1在0.9 V) 和显著的稳定性,在30,000个循环后仅有17.3%的衰变.
- 在双封闭催化剂中没有观察到结构变化,这表明它们具有更高的耐用性.
- 碳封闭比例可以通过调整碳外厚度来调整.
结论:
- 双封闭设计有效地保护金属间纳米粒子免受恶劣的PEMFC环境的影响.
- 这种方法显著提高了催化剂的稳定性和性能,超过了现有的PtCo催化剂,并实现了DOE 2025的目标.
- 合成策略是多功能性的,适用于其他金属间化合物,如PtFe和PtCu.
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