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


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.

SUBMITTER: Liu YY 

PROVIDER: S-EPMC7642269 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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

Liu Yuan-Yuan YY   Li Xiang-Chun XC   Wang Shi S   Cheng Tao T   Yang Huiyan H   Liu Chen C   Gong Yanting Y   Lai Wen-Yong WY   Huang Wei W  

Nature communications 20201103 1


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  ...[more]

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