Ultralight Covalent Organic Framework/graphene Aerogels with Hierarchical Porosity

08 April 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The fabrication of macroscopic architectures of covalent organic frameworks (COFs) instead of powders is of great significance to fully exploit their chemical functionality and porosity and to enable sufficient diffusion and mass transfer through the material. However, it is still a challenge to achieve the assembly of such 3D hierarchical porous architectures from COFs. Herein, COF/reduced graphene oxide (rGO) aerogels are presented, which are synthesized by a hydrothermal approach. The COFs grow in situ along the surface of the 2D graphene sheets, which are stacked in a 3D fashion, forming an aerogel after freeze-drying, which can be compressed and expanded several times without breaking. Thus, a facile, green and pyrolysis-free synthetic method for ultralight functional materials has been achieved. The COF/rGO aerogel shows 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 superior cycling stability over 5000 cycles, which is among the best results reported for COF-based supercapacitors so far. This work demonstrates a great advance for green synthesis of ultralight materials for environmental and energy applications.


covalent organic frameworks (COFs)
Graphene Aerogel
porous materials
energy storage capabilities

Supplementary materials

ESI Changxia Li


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.