Revealing the Atomic Restructuring of Pt-Co Nanoparticles
Revealing the Atomic Restructuring of Pt-Co Nanoparticles
复制标题
DOI：
10.1021/nl500553a
复制
发表时间：
2014-06-01
期刊：
影响因子：
10.8
通讯作者：
Zheng, Haimei
中科院分区：
文献类型：
--
作者：
Xin, Huolin L.;Alayoglu, Selim;Zheng, Haimei
我们利用环境透射电子显微镜研究了Pt-Co双金属纳米颗粒在O-2和H-2气氛中氧化和还原过程。在氧化过程中，Co迁移到纳米颗粒表面形成应变外延CoO膜。它随后通过应变松弛形成岛屿。原子的重组作为时间的函数被捕获。在还原过程中，钴迁移回主体，在表面留下一层铂。
We studied Pt-Co bimetallic nanoparticles during oxidation in O-2 and reduction in H-2 atmospheres using an aberration corrected environmental transmission electron microscope. During oxidation Co migrates to the nanoparticle surface forming a strained epitaxial CoO film. It subsequently forms islands via strain relaxation. The atomic restructuring is captured as a function of time. During reduction cobalt migrates back to the bulk, leaving a monolayer of platinum on the surface.