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Ultralight covalent organic framework/graphene aerogels with hierarchical porosity.
Nature Communications ( IF 14.7 ) Pub Date : 2020-09-18 , DOI: 10.1038/s41467-020-18427-3
Changxia Li 1 , Jin Yang 1 , Pradip Pachfule 1 , Shuang Li 1 , Meng-Yang Ye 1 , Johannes Schmidt 1 , Arne Thomas 1
Affiliation  

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.



中文翻译:

具有分级孔隙率的超轻共价有机骨架/石墨烯气凝胶。

从共价有机框架 (COF) 制造宏观物体具有挑战性,但对于充分利用其化学功能和孔隙率具有重要意义。在此,提出了通过水热法合成的 COF/还原氧化石墨烯 (rGO) 气凝胶。COFs沿2D石墨烯片表面原位生长,以3D方式堆叠,冷冻干燥后形成具有分层多孔结构的超轻气凝胶,可多次压缩和膨胀而不会破裂。COF/rGO 气凝胶显示出优异的吸收能力(吸收 >200 g 有机溶剂/g 气凝胶),可用于从水中去除各种有机液体。此外,作为超级电容器装置的活性材料,气凝胶可提供 269 F g -1的高电容在 0.5 A g -1和超过 5000 次循环的循环稳定性。

更新日期:2020-09-20
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