Search International and National Patent Collections

1. (WO2017155665) ELECTROCHEMICAL PRODUCTION OF GRAPHENE SHEETS DIRECTLY FROM GRAPHITE MINERAL

Pub. No.:    WO/2017/155665    International Application No.:    PCT/US2017/017458
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Feb 11 00:59:59 CET 2017
IPC: B82Y 30/00
C25B 1/00
Applicants: ZHAMU, Aruna
JANG, Bor Z.
NANOTEK INSTRUMENTS, INC.
Inventors: ZHAMU, Aruna
JANG, Bor Z.
Title: ELECTROCHEMICAL PRODUCTION OF GRAPHENE SHEETS DIRECTLY FROM GRAPHITE MINERAL
Abstract:
A method of producing graphene sheets directly from graphite, comprising: (a) forming an intercalated graphite compound by an electrochemical intercalation procedure conducted in an intercalation reactor, containing (i) a liquid solution electrolyte comprising an intercalating agent and a graphene plane-wetting agent dissolved therein; (ii) a working electrode that contains the graphite material powder as an active material; and (iii) a counter-electrode, and wherein a current is imposed upon the working electrode and counter electrode at a current density sufficient for effecting electrochemical intercalation of the intercalating agent and/or wetting agent into interlayer spacing, wherein the wetting agent is selected from melamine, ammonium sulfate, sodium dodecyl sulfate, Na(ethylenediamine), tetraalkyammonium, ammonia, carbamide, hexamethylenetetramine, organic amine, poly(sodium-4-styrene sulfonate), or a combination thereof; and (b) exfoliating and separating the intercalated graphite compound using ultrasonication, thermal shock exposure, and/or a mechanical shearing treatment to produce graphene sheets.