通过对PtsML/Pd{100}进行CO电吸收研究的亚单层催化剂的有限尺寸效应
Qiuyi Yuan1, Hieu A Doan1, Lars C Grabow1
1Department of Chemical and Biomolecular Engineering and ‡Department of Electrical and Computer Engineering, University of Houston , Houston, Texas 77204, United States of America.
Journal of the American Chemical Society
|September 15, 2017
概括
在表面上的二维团中,有限的尺寸效应会产生局部压缩应变,改变一氧化碳的化学吸收. 控制集群大小提供了一种调整催化剂特性的方式.
科学领域:
- 表面科学
- 材料科学
- 催化剂
背景情况:
- 了解纳米材料的应变效应对于催化剂设计至关重要.
- 在表面上的二维集群是研究催化性能的模型系统.
研究的目的:
- 在Pd{100}上量化2D Pt集群中的局部应变.
- 研究这种应变对一氧化碳 (CO) 化学吸收的影响.
主要方法:
- 扫描道显微镜 (STM)
- 抽象规范化的界面里埃变换红外光谱 (SNIFTIRS)
- 密度函数理论 (DFT) 模拟
主要成果:
- 由于有限尺寸效应,SNIFTIRS和DFT之间的良好协议证实了Pt集群中的局部压缩应变.
- 这种菌株显著改变了CO的化学吸收特性.
- 发现Pt和Pd之间没有一致的菌株.
结论:
- 有限尺寸效应,而不是连贯应变,在Pd100上的2D Pt集群中诱导局部应变.
- 这种局部应变会影响催化活性.
- 控制集群大小是调整子单层系统中催化剂性能的一种可行的策略.
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