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

Yuan-Yuan Liu, Xiang-Chun Li, Shi Wang, Tao Cheng, Huiyan Yang, Chen Liu, Yanting Gong, Wen-Yong Lai () and Wei Huang ()
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Yuan-Yuan Liu: Nanjing University of Posts & Telecommunications
Xiang-Chun Li: Nanjing University of Posts & Telecommunications
Shi Wang: Nanjing University of Posts & Telecommunications
Tao Cheng: Nanjing University of Posts & Telecommunications
Huiyan Yang: Nanjing University of Posts & Telecommunications
Chen Liu: Nanjing University of Posts & Telecommunications
Yanting Gong: Nanjing University of Posts & Telecommunications
Wen-Yong Lai: Nanjing University of Posts & Telecommunications
Wei Huang: Nanjing University of Posts & Telecommunications

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-18844-4

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