钴镍合金纳米颗粒的合成及孪晶结构形成机理的电镜原位研究

钴镍合金纳米颗粒的合成及孪晶结构形成机理的电镜原位研究

胡  阳，朱  柳，李红利，毕开琦，陈  斌，彭  勇^*

（1.兰州大学化学化工学院和兰州大学电镜中心，甘肃 兰州730000；2.兰州大学材料与能源学院和兰州大学电镜中心，甘肃 兰州730000）

摘  要 本文针对钴镍合金纳米颗粒的生长及其内部孪晶结构形成的动态过程进行了电镜原位实时观测和分析研究。实验结果表明，在升温过程中相互独立的合金纳米颗粒能够以（）和（111）晶面族以一定夹角相互吞噬融合。同时，CoNi合金催化剂颗粒中孪晶结构的形成需要借助不同晶体取向的中间过渡区域来进行旋转调整，并且该过程同样需要遵循晶面选择性。而对于合金催化剂颗粒生长过程以及孪晶结构形成机理的理解可以帮助我们通过温度的精确控制来实现对催化剂颗粒的定向调控。

关键词 原位电子显微学；过渡金属；孪晶结构；晶面选择性机理

中图分类号：O76；O614；TG115.21⁺5.3  

文献标识码：Adoi:10.3969/j.issn.1000-6281.2021.05.005

In-situelectron microscopy study on the synthesis of cobalt-nickel alloy nanoparticles and the formation mechanism of twin structure

HU Yang^1，2，ZHU Liu ²，LI Hong-li ²，BI Kai-qi ²，CHEN Bin ²，PENG Yong ^2*

（1.College of Chemistry and Chemical Engineering and Electron Microscopy Centre of Lanzhou University，Lanzhou Gansu 730000；2. College of Materials and Energy and Electron Microscopy Centre of Lanzhou University，Lanzhou Gansu 730000, China）

Abstract  The dynamic process of the growth of cobalt-nickel alloy nanoparticles and the formation of the twin structure was observed and analyzed by in-situ electron microscopy in real time. The experimental results show that the alloy nanoparticles that are independent of each other can swallow and fuse each other at a certain angle at a certain angle between the () and (111) crystal facets during the heating process. At the same time, the formation of the twin structure in the CoNi alloy catalyst particles needs to be adjusted by a rotation with the aid of the intermediate transition regions of different crystal orientations, and the process also should follow the crystal face selectivity. The understanding of the growth process of the alloy catalyst particles and the formation mechanism of the twin structure can help us achieve directional control of the catalyst particles through the precise control of the temperature.

Keywords  In-situ electron microscopy; transition metal; twin structure; crystal facet selectivity mechanism

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