接近原子尺度的超细合金集群用于超稳定的酸电催化
Guanzhen Chen1, Wen Chen1, Ruihu Lu2
1Institute of Flexible Electronics (IFE) and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an 710129, China.
Journal of the American Chemical Society
|September 29, 2023
概括
一种新型的双功能催化剂与- (Pt-Er) 合金集群和单个原子增加了在酸性电解质中的演化和氧化反应 (HER和HOR) 的活性和耐久性,其性能优于传统的Pt/C催化剂.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 质子交换膜 (PEM) 电解器和燃料电池依赖基 (Pt) 催化剂.
- 目前的Pt催化剂面临的挑战包括低质量活性,不稳定性和CO中毒.
- 开发先进的催化剂对于高效的生产和利用至关重要.
研究的目的:
- 设计和评估一种用于增强演变和氧化反应 (HER和HOR) 的新型双功能催化剂.
- 提高电催化剂在酸性环境中的活性,耐用性和碳耐受性.
- 探索Pt-Er合金集群和单个原子在催化中的协同效应.
主要方法:
- 由Pt-Er合金集群和原子分散的Pt和Er单个原子组成的双功能催化剂的合成.
- 在酸演化和氧化反应中的催化剂性能的电化学特征.
- 在高电流密度 (1000 mA cm-2) 上进行长期稳定性测试.
主要成果:
- 与商业Pt/C相比,Pt-Er催化剂的质量活性和转换频率 (TOF) 显著更高.
- 观察到异常稳定性,催化剂在1000 mA cm-2下运行超过1200小时.
- 催化剂在HOR和优异的CO耐受性方面表现出色.
结论:
- 开发的Pt-Er双功能催化剂为酸性HER和HOR提供了传统基于Pt的催化剂的有希望的替代品.
- Pt和Er之间的协同作用增强了催化活性,稳定性和CO耐受性.
- 这项工作为在工业电流密度下持久的低Pt负载电催化剂提出了可行的策略.
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