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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Liu YY,Li XC,Wang S,Cheng T,Yang H,Liu C,Gong Y,Lai WY,Huang Wdoi
10.1038/s41467-020-18844-4subject
Has Abstractpub_date
2020-11-03 00:00:00pages
5561issue
1issn
2041-1723pii
10.1038/s41467-020-18844-4journal_volume
11pub_type
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