Abstract
As an important precursor and derivate of graphene, graphene oxide (GO) has received wide attention in recent years. However, the synthesis of GO in an economical and efficient way remains a great challenge. Here we reported an improved NaNO3-free Hummers method by partly replacing KMnO4 with K2FeO4 and controlling the amount of concentrated sulfuric acid. As compared to the existing NaNO3-free Hummers methods, this improved routine greatly reduces the reactant consumption while keeps a high yield. The obtained GO was characterized by various techniques, and its derived graphene aerogel was demonstrated as high-performance supercapacitor electrodes. This improved synthesis shows good prospects for scalable production and applications of GO and its derivatives.
Highlights
Graphene[1], a single layer of carbon atoms bonded into a honeycomb two-dimensional lattice, has attracted great interests from scientists and engineers because of its extraordinary properties and wide applications[2,3], such as functional films, electric devices and energy storage devices (Li-ion batteries, supercapacitors) etc
graphene oxide (GO) was prepared from natural flake graphite through one-pot synthesis based on new modified Hummers method
The obtained GO was named GO2, while for comparison, another GO coined as GO1 was synthesized by Kovtyukhova improved method[20]
Summary
Graphene[1], a single layer of carbon atoms bonded into a honeycomb two-dimensional lattice, has attracted great interests from scientists and engineers because of its extraordinary properties and wide applications[2,3], such as functional films, electric devices and energy storage devices (Li-ion batteries, supercapacitors) etc. Different from graphene, which is almost not soluble and cannot be dispersed in water or any organic solvent[3,4], graphene oxide (GO) contains high-density oxygen functional groups, like hydroxyl and epoxy group on its basal plane, and carboxyl at its edge[4,5]. It is of great significance to develop economical, eco-friendly and scalable routines to produce GO3,9,10
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