Ultralight covalent organic framework/graphene aerogels with hierarchical porosity

Changxia Li, Jin Yang, Pradip Pachfule, Shuang Li, Meng-Yang Ye, Johannes Schmidt and Arne Thomas ()
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Changxia Li: Technische Universität Berlin
Jin Yang: Technische Universität Berlin
Pradip Pachfule: Technische Universität Berlin
Shuang Li: Technische Universität Berlin
Meng-Yang Ye: Technische Universität Berlin
Johannes Schmidt: Technische Universität Berlin
Arne Thomas: Technische Universität Berlin

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

Abstract: Abstract The fabrication of macroscopic objects from covalent organic frameworks (COFs) is challenging but of great significance to fully exploit their chemical functionality and porosity. Herein, COF/reduced graphene oxide (rGO) aerogels synthesized by a hydrothermal approach are presented. The COFs grow in situ along the surface of the 2D graphene sheets, which are stacked in a 3D fashion, forming an ultralight aerogel with a hierarchical porous structure after freeze-drying, which can be compressed and expanded several times without breaking. The COF/rGO aerogels show excellent absorption capacity (uptake of >200 g organic solvent/g aerogel), which can be used for removal of various organic liquids from water. Moreover, as active material of supercapacitor devices, the aerogel delivers a high capacitance of 269 F g−1 at 0.5 A g−1 and cycling stability over 5000 cycles.

Date: 2020
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DOI: 10.1038/s41467-020-18427-3

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