Ultralight covalent organic framework/graphene aerogels with hierarchical porosity.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32948768.
- Also identified by DOI 10.1038/s41467-020-18427-3 and PMC identifier 7501297.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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<sup>-1</sup> at 0.5 A g<sup>-1</sup> and cycling stability over 5000 cycles.