Dynamically observing the formation of MOFs-driven Co/N-doped carbon nanocomposites by in-situ transmission electron microscope and their application as high-efficient microwave absorbent
You Zhou1,§, Xia Deng2,§, Hongna Xing1, Hongyang Zhao3, Yibo Liu1, Lisong Guo1, Juan Feng1, Wei Feng1, Yan Zong1, Xiuhong Zhu1, Xinghua Li1(), Yong Peng2(), Xinliang Zheng1
School of Physics, State Key Laboratory of Photoelectric Technology and Functional Materials, Northwest University, Xi’an 710127, China
School of Materials and Energy, Electron Microscopy Centre of Lanzhou University, Lanzhou University, Lanzhou730000, China
School of Chemistry, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an 710049, China
§ You Zhou and Xia Deng contributed equally to this work.
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The formation process of zeolitic imidazolate framework (ZIF)-67 derived Co/N-doped carbon nanocomposites is dynamically investigated by in-situ transmission electron microscopy (TEM) assisted with ex-situ characterizations. Several key findings were observed: (1) graphitization of carbon; (2) volatilization of Co nanocrystals; (3) generation process of carbon nanotubes (CNTs) catalyzed by Co. The nanocomposites show high-efficient microwave absorption performance that can be tuned by pyrolysis temperature, heating rate, and mass fraction. These findings are helpful to understand the formation of metal-organic frameworks (MOFs) derived carbon-based composites and expand their practical applications.
Abstract
Metal-organic frameworks (MOFs) derived magnetic carbon-based nanocomposites have drawn widespread attentions due to the well distributed nanocrystals in carbon matrix. Dynamically observing the formation process is urgently needed. Herein, taking zeolitic imidazolate framework (ZIF)-67 as an example, the pyrolysis process is investigated by in-situ transmission electron microscopy (TEM) assisted with ex-situ characterizations. Co nanocrystals are evenly distributed in carbon at the initial stage of carbonization. By increasing pyrolysis temperature, the nanocrystals grow bigger and migrate to carbon surface. The carbon texture transfers from amorphous to crystalline at 600 °C, and thoroughly converts at 800 °C. In-situ heating TEM shows that more tiny Co nanocrystals move out from the carbon texture by increasing temperature from 700 to 800 °C. At 1,000 °C, some escaped tiny Co nanocrystals are volatilized and disappeared. The residual escaped Co nanocrystals catalyze the formation of carbon nanotubes (CNTs). Due to the synergistic effect between Co and carbon as well as porous structure, the nanocomposites show high-efficient microwave absorption performance, which can be tuned by pyrolysis temperature, heating rate, and mass fraction. When the mass fraction is 30 wt.%, the nanocomposites obtained at 600 or 700 °C display remarkable microwave absorption with optimal reflection loss (RL) smaller than −70 dB and effective absorption band larger than 4.9 GHz. Combining the in-situ and ex-situ techniques, some key findings were observed: (1) graphitization of carbon; (2) volatilization of Co nanocrystals; (3) formation process of CNTs by Co catalyst. These findings are helpful to understand the formation of MOFs derived carbon-based composites and expand their practical applications, especially for microwave absorption.
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