Research progress in the preparation of new two-dimensional layered metal carbon/nitrides by molten salt method
Two-dimensional metal carbonitride(MXene)materials are a new two-dimensional material family composed of transition metal elements such as aluminum,titanium,niobium,molybdenum,and carbon and nitrogen elements,which have broad application prospects in energy storage and conversion,electromagnetic shielding,sensors,catalysis and other fields.The structure and physicochemical properties of MXene are determined by the combination of transition metal M and X element and the type of surface functional group Tx.Therefore,in the preparation and application of materials,it is a hot and difficult point to develop a controlled synthesis method to prepare MXenes with tunable element combination.Molten salt synthesis is one of the methods to prepare MXene,which makes full use of the characteristics of high temperature,high solubility and wide electrochemical window of molten salt.As a result,some special MXene materials that cannot be synthesized with conventional aqueous solutions can be synthesized with molten salt,thus expanding the application range of materials.In this paper,the latest research progress of MXene materials prepared by high temperature molten salt as oxidation etchant or solvent was reviewed,and the influence mechanism of different eutectic salts,reactants and reaction conditions on the structure of MAX and MXene materials was discussed.At the same time,the future development direction and main challenges of molten salt method were also prospected.
molten salttwo dimensional metal carbides and/or nitridesoxidation reactionhigh termperaturesurface termination
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