The invention relate to graphite materials, and more specifically to the exfoliation of graphite using deep eutectic solvents, to methods related thereto, to polymeric composite materials containing graphene and the methods for the production thereof, and to graphene/metal, exfoliated graphite/metal, graphene/metal oxide and exfoliated graphite/metal oxide composite materials and the methods for the production thereof.

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Exfoliation of graphite with deep eutectic solvents

The present invention provides a method for the production in an electrochemical cell of one or more of graphene, graphite nanoplatelet structures having a thickness of less than 100nm, and graphane, wherein the cell comprises: (a) a negative electrode which is graphitic; (b) a positive electrode which may be graphitic or another material; and (c) an electrolyte selected from (i) an ionic liquid; (ii) a deep eutectic solvent; and (iii) a solid ionic conductor, optionally further comprising (iv) one or more ionic species, wherein the amount of (i), (ii) or (iii) and (iv) is greater than 50wt% based on the total weight of the electrolyte; and wherein the electrolyte includes a mixture of different cations; and wherein the method comprises the step of passing a current through the cell to intercalate ions into the graphitic negative electrode so as to exfoliate the graphitic negative electrode.

Production of graphene and graphane

An improved method for concentrating dispersions of graphene oxide, coating a substrate with a layer of a graphene oxide solution, and producing a supported graphene membrane stabilised by controlled deoxygenation; and graphene-based membranes that demonstrate ultra-fast water transport, precise molecular sieving of gas and solvated molecules, and which show great promise as novel separation platforms.

Graphene oxide membranes and methods related thereto

The invention relates to a method for preparing graphene by electrochemical anode stripping in low-temperature molten salt. The method comprises the following steps of heating three-phase molten saltor two-phase molten salt, stirring, melting the molten salt, and uniformly mixing, so as to obtain the liquid molten salt, wherein the three-phase molten salt is a mixture of acetamide, urea and salt,and the two-phase molten salt is a mixture of acetamide and salt or a mixture of urea and salt; selecting two graphite electrodes as a cathode and an anode, using the liquid molten salt as an electrolyte, and extending the graphite electrodes into the electrolyte; connecting a power supply with the cathode and anode electrodes of the graphite, opening the power supply, electrolyzing for 2 to 5 hours at the constant pressure of 1 to 5V, increasing the voltage to 8 to 20V, maintaining for 2 to 100 hours, washing and drying, so as to obtain the graphene. The graphene preparation method has the advantages that the graphene preparation equipment is simple, the operation process is simple and is easy to implement, the controllability is high, and the price is low; the environment-friendly effect is good, the cost is low, and the operation is easy.

Method for preparing graphene by electrochemical anode stripping in low-temperature molten salt

A method of making a graphene-containing material comprising the steps of: electrolytically reducing a transition metal oxide to a transition metal in an electrolytic cell using a molten salt electrolyte and a carbon anode; followed by extracting a dry graphene material from the electrolytic cell. Also provided is a graphene-containing material obtainable by the method of the invention.

Methods of making graphene materials

A process of producing graphene and / or graphite nanoplatelet structures by the electrochemical reduction of carbon oxide in an electrochemical cell is provided, wherein the cell includes (a) a negative electrode including a transition metal, transition metal-containing alloy, transition metal-containing oxide, transition metal containing ceramic, or a combination thereof; (b) a positive electrode; and (c) an electrolyte; wherein the process includes the step of passing a current between the electrodes in the presence of the carbon oxide

Electrochemical process for production of graphene

L'invention concerne un procede de production de structures de nanoplaquette de graphene et/ou de graphite par reduction electrochimique d'oxyde de carbone dans une cellule electrochimique, la cellule incluant (a) une electrode negative incluant un metal de transition, un alliage contenant du metal de transition, un oxyde contenant du metal de transition, une ceramique contenant du metal de transition, ou une de leurs combinaisons; (b) une electrode positive; et (c) un electrolyte; le procede incluant l'etape consistant a faire passer un courant entre les electrodes en presence de l'oxyde de carbone.

Procédé électrochimique de production de graphène

The emerging area of two dimensional (2D) materials has attracted a great deal of scientific attention in recent years. Like graphene, these materials can be exfoliated to single atom thickness and can then be mechanically layered together to create new van der Waals crystals with bespoke properties. However the performance of such materials is strongly dependent on the quality of the crystals and the interfaces between different crystals. Cross sectional imaging using atomic resolution transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) is the only technique able to characterize the nature of buried interfaces in these engineered van der Waals crystals [1].

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Matej Velický

Papers

Electrochemical process for production of graphene

Procédé électrochimique de production de graphène

Understanding 2D Crystal Vertical Heterostructures at the Atomic Scale Using Advanced Scanning Transmission Electron Microscopy