氧化剂
氧化还原
金属
氧化物
纳米颗粒
化学工程
粒子(生态学)
氧气
贵金属
化学
化学物理
材料科学
纳米技术
无机化学
冶金
地质学
工程类
有机化学
海洋学
作者
Hannes Frey,Arik Beck,Xing Huang,Jeroen A. van Bokhoven,Marc‐Georg Willinger
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2022-05-26
卷期号:376 (6596): 982-987
被引量:189
标识
DOI:10.1126/science.abm3371
摘要
The dynamic interactions between noble metal particles and reducible metal-oxide supports can depend on redox reactions with ambient gases. Transmission electron microscopy revealed that the strong metal-support interaction (SMSI)-induced encapsulation of platinum particles on titania observed under reducing conditions is lost once the system is exposed to a redox-reactive environment containing oxygen and hydrogen at a total pressure of ~1 bar. Destabilization of the metal-oxide interface and redox-mediated reconstructions of titania lead to particle dynamics and directed particle migration that depend on nanoparticle orientation. A static encapsulated SMSI state was reestablished when switching back to purely oxidizing conditions. This work highlights the difference between reactive and nonreactive states and demonstrates that manifestations of the metal-support interaction strongly depend on the chemical environment.
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