在金属有机框架中限制的面向孔空间分区的三明治白金阵列,以促进整体水分
Jia-Min Huo1,2, Ying Wang1, Ze-Lin Ma3
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710062, China.
Journal of the American Chemical Society
|June 13, 2025
概括
这项研究引入了一种在金属有机框架 (MOF) 中分散 (Pt) 原子的新方法,从而产生高效的催化剂. 这些新的Pt@MOF-BCP催化剂在和氧进化反应中表现出卓越的性能.
科学领域:
- 材料科学
- 纳米技术
- 催化剂
背景情况:
- 对于高效的催化剂来说,高贵金属在多孔材料中的原子水平分散是关键,但仍然具有挑战性.
- 目前的方法很难控制催化框架中的金属原子分布和电子特性.
研究的目的:
- 在金属有机框架 (MOF) 中精确地限制 (Pt) 原子以创建高效和稳定的电催化剂的方法.
- 研究孔隙结构,Pt原子排列和催化活性之间的关系.
主要方法:
- 在三明治化合物的启发下,Pt原子通过与芳香孔隙分离器的结合相互作用被限制在MOF中.
- 采用了交流高角度环状暗场扫描传输电子显微镜 (HAADF-STEM),X射线吸收光谱 (XAS) 和理论模拟.
- 系统地改变了芳香环之间的距离,以控制Pt粒子大小和电子结构.
主要成果:
- 在MOF结构中形成1D无限Pt数组.
- 随着芳香环距离的减少,Pt粒子大小的线性减少,与电子轨道调节相关.
- 优化的Pt@MOF-BCP催化剂表现出高效的Pt利用率,优越的电子传输和出色的稳定性.
- 超低演变反应 (HER) (2.5 mV) 和氧演变反应 (OER) (265 mV) 在10 mA·cm-2 .
- 在实践应用中,降低电池电压为1.47V在10mA·cm-2.
结论:
- 开发的方法可以精确控制MOF中的原子级Pt分散,从而产生先进的电催化材料.
- Pt@MOF-BCP表现出异常的双功能电催化性能,超过了大多数基准催化剂.
- 这种方法为设计具有更高效率和稳定的下一代催化剂提供了有希望的途径.
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