Self-templated synthesis of uniform hollow spheres based on highly conjugated three-dimensional covalent organic frameworks

Covalent organic frameworks (COFs) have served as a family of porous crystalline molecules for various promising applications. However, controllable synthesis of COFs with uniform morphology is paramount yet still remains quite challenging. Herein, we report self-templated synthesis of uniform and u...

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Bibliographic Details
Published in:Nature communications 2020-11, Vol.11 (1), p.5561-5561, Article 5561
Main Authors: Liu, Yuan-Yuan, Li, Xiang-Chun, Wang, Shi, Cheng, Tao, Yang, Huiyan, Liu, Chen, Gong, Yanting, Lai, Wen-Yong, Huang, Wei
Format: Article
Language:English
Subjects:
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Capacitance
Covalence
Crystal structure
Crystallinity
Diameters
Electrode materials
Electrolytes
Humanities and Social Sciences
Lithium
Lithium ions
Morphology
multidisciplinary
Ostwald ripening
Polymers
Porous materials
Science
Science (multidisciplinary)
Spheres
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Summary:Covalent organic frameworks (COFs) have served as a family of porous crystalline molecules for various promising applications. However, controllable synthesis of COFs with uniform morphology is paramount yet still remains quite challenging. Herein, we report self-templated synthesis of uniform and unique hollow spheres based on highly conjugated three-dimensional (3D) COFs with diameters of 500–700 nm. A detailed time-dependent study reveals the continuous transformation from initial nano sphere-like particles into uniform hollow spherical structures with Ostwald ripening mechanism. Particularly, the resulting 3D COF (3D-Sp-COF) is prone to transport ions more efficiently and the lithium-ion transference number ( t + ) of 3D-Sp-COF reaches 0.7, which even overwhelms most typical PEO-based polymer electrolytes. Inspiringly, the hollow spherical structures show enhanced capacitance performance with a specific capacitance of 251 F g −1 at 0.5 A g −1 , which compares favorably with the vast majority of two-dimensional COFs and other porous electrode materials. Covalent organic frameworks (COFs) are promising porous crystalline materials but controllable synthesis of COFs with uniform morphology remains challenging. Here, the authors report a self-templated synthesis of uniform and unique hollow spheres based on highly conjugated three-dimensional COFs.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-18844-4