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Mechanochemical Preparation and Application of Graphene Oxide for obtaining 3D Graphene-based Hydrogel/Aerogel

In the last decade, graphene and graphene oxide (GO) have been intensively investigated due to their excellent electronic, optical, mechanical, thermal properties and their wide range of applications such as electronic and energy storage devices, optical materials, biosensors and water treatment. GO is single- atom carbon layer containing range of reactive oxygen groups upon which its structure and properties directly depend. Nevertheless, large-scale production of high quality GO is still a challenging task for researchers and since industrial-scale chemical synthesis of GO are inherently generating large amount of toxic waste, it is more than necessary to find a new, cleaner and cheaper way of its production. [1] However, mechanochemistry is becoming more disseminated as a technique because it can promote reactions between solids, with either no added solvent or only minimal amounts. Moreover, it offers more sustainable, environmental friendly and energy- facilitatied synthesis pathways, which could be the way to reduce or completely remove our current dependence on solvents in GO production. [2] Herein, we present versatile and eco-friendly approach for mechanochemical preparation of GO. Furthermore, we also present it is possible to obtain 3D graphene hydro- (GHs) and aerogels (GAs) via one-step hydrothermal method using mechanochemically prepared GO. GHs are a new class of 3D carbon monoliths holding promise for applications as diverse as electrochemical energy storage, tissue engineering, CO2 capture and pollutant adsorption. They consist of entangled layers of graphene, albeit they partially retain the excellent properties of monolayer graphene.

Graphene oxide ; mechanochemical synthesis ; 3D Graphene hydrogels

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