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
Yong Yang
中科院分区:
化学3区
文献类型:
--
作者:
Chenwei Ma;Yifeng Yun;Tianfu Zhang;Haiyun Suo;Lai Yan;Xianfeng Shen;Yongwang Li;Yong Yang

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作为一个先决条件的基本步骤,钴(Co)氧化物还原形成金属钴是必不可少的显示活性的多相催化。然而,钴氧化物的相和形貌演变的内在原理和活性钴位的形成机制仍然不清楚。在这里,我们通过使用最先进的原位透射电子显微镜(TEM)来解决这个长达数十年的问题,以阐明初始晶相和Co氧化物的尺寸在H2气氛下调节还原速率,相和形态演变中的多个作用,通过排除促进剂和载体的可能干扰。 本研究丰富了目前对钴氧化物表面结构和形貌演变的认识,为钴基催化材料及其预处理方案的合理设计提供了参考。
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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