Method for electrochemically preparing MXene

Abstract

The invention provides a method for electrochemically preparing MXene. The method comprises the following steps: preparing an MAX base material into a working electrode, fixing the working electrode in an electrolytic tank, adding an electrolyte, which is fluorine-containing anion liquid to serve as an etching agent, into the electrolytic tank to make the working electrode immersed into the electrolyte, taking a working electrode as a positive electrode, applying a voltage to make the fluorine-containing anion liquid ionized to generate .F free radicals, and enabling the .F free radicals to etch A-layer atoms in the MAX base metal; and after the electrolysis is finished, separating the electrolyte containing an MXene dispersion to obtain the MXene material. According to the electrochemicalstripping method, the mild, green and pollution-free ionic liquid is adopted as the electrolyte, hydrofluoric acid with high corrosivity and other byproducts such as strong acid and strong alkali cannot be generated in the electrochemical stripping process, the preparation process is safe and non-toxic, the electrochemical pressurization range is small, the safety is high, and green preparation of MXene is realized.

Description

technical field [0001] The invention relates to the technical field of two-dimensional nanomaterials, in particular to a method for electrochemically preparing two-dimensional metal carbonitride MXene. Background technique [0002] MXene is one of the most promising two-dimensional materials in recent years. It is a layered structure material composed of transition metal nitrides or carbides. Since it was first successfully prepared by the team of Professor Yury Gogotsi of Drexel University in the United States in 2011, it has quickly attracted attention in the academic circle due to its excellent characteristics. Widespread concern. The chemical formula of MXene material is M n+1 x n T x , where (n=1–3), M represents early transition metals; X represents C or N; T represents surface groups, mainly -OH, -O and -F. The MXene material is obtained by etching the A layer in the base material MAX material. Wherein A is Al or Si. Since F- ions can form strong chemical bonds...

AI Technical Summary

Problems solved by technology

Some researchers used strong acid (HCl) as the electrolyte to prepare MXene by electrochemical methods. In the electrochemical process, the corrosion of strong acid is strengthened, which is easy to cause excessive etching and generate simple carbon. Therefore, it is difficult to realize the reliable production of MXene. controlled electrochemical preparation

Moreover, these methods either still generate hydrofluoric acid during the preparation process, or require high temperature, strong acid, strong alkali and other environments, which have great danger and environmental pollution, and are difficult to achieve large-scale production and application

Images