Insight into the Structural Evolution of the Cobalt Oxides Nanoparticles upon Reduction Process: An In Situ Transmission Electron Microscopy Study
Insight into the Structural Evolution of the Cobalt Oxides Nanoparticles upon Reduction Process: An In Situ Transmission Electron Microscopy Study
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洞察氧化钴纳米颗粒在还原过程中的结构演变:原位透射电子显微镜研究
DOI:
10.1002/cctc.202100983
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发表时间:
2021-08
期刊:
影响因子:
4.5
通讯作者:
Yong Yang
中科院分区:
文献类型:
--
作者:
Chenwei Ma;Yifeng Yun;Tianfu Zhang;Haiyun Suo;Lai Yan;Xianfeng Shen;Yongwang Li;Yong Yang
As a prerequisite elementary step, the reduction of cobalt (Co) oxides to form metallic Co is essential to display activity in heterogeneous catalysis. Nevertheless, the intrinsic principle of phase and morphology evolution for Co oxides and formation mechanism of the active Co site remains unclear. Here, we resolve this decades‐long question by using a state‐of‐the‐art in situ transmission electron microscopy (TEM) to elucidate the multi‐role of initial crystalline phase and size of Co oxides in modulation of reduction rate, phase and morphology evolution under H2 atmosphere, by excluding the possible interference from promoter and support. We anticipate that this study enriches current understanding on the surface structure and morphology evolution of Co oxides, and provides reference for rational design of Co‐based catalytic material as well as its pretreatment protocol.
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