Medium-entropy MAX phase material, medium-entropy two-dimensional material and preparation method of medium-entropy MAX phase material

Abstract

The invention discloses a medium-entropy MAX phase material, a medium-entropy two-dimensional material and a preparation method thereof, wherein the chemical general formula of the medium-entropy MAX phase material is Mn + 1AXn, and the medium-entropy MAX phase material is characterized in that an M element is selected from three or four transition metal elements and lanthanide elements; the M element contains at least two transition metal elements or lanthanide elements capable of forming a solid solution; the A element is selected from at least one of VIIB, VIII, IB, IIB, IIIA, IVA, VA and VIA family elements; the X is at least one of carbon, nitrogen, boron or oxygen, and n is 1, 2, 3, 4, 5 or 6. A medium-entropy two-dimensional material can be obtained after the component A in the medium-entropy MAX phase material is etched. In the invention, the medium-entropy MAX phase material and the medium-entropy two-dimensional material which can stably exist in a single phase are prepared by introducing the multi-component transition metal capable of achieving solid solution, inducing the structure to generate lattice distortion and optimizing the electronic structure.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a medium-entropy MAX phase material, a medium-entropy two-dimensional material and a preparation method thereof. Background technique [0002] The MXene two-dimensional material is obtained by selectively etching the A component from the MAX phase. The earliest reported method of etching the MAX phase to obtain MXene is hydrofluoric acid, which etches Ti 3 AlC 2 Etched to get MXene Ti 3 C 2 . Due to the high toxicity, corrosion and environmental hazards of hydrofluoric acid, the researchers developed a hydrochloric acid + fluoride salt system to etch the MAX phase, and successfully prepared a series of MXene. In 2020, the team of Professor Huang Qing from the Ningbo Institute of Materials, Chinese Academy of Sciences used molten chloride salts to etch the MAX phase, and prepared a series of MXenes containing Cl functional groups such as Cl-Ti 3 C 2 , Cl-Ti 2 C and Cl-Ti 3 CN ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problem that the medium-entropy MAX phase material and the medium-entropy two-dimensional material are easy to decompose or phase-separate during the preparation process, and it is difficult to prepare a single phase. On the one hand, the present invention provides a medium-entropy MAX-phase material whose general chemical formula is M n+1 AX n , the M element is selected from three or four transition metal elements and lanthanide elements, wherein, the M element contains at least two transition metal elements and lanthanide elements capable of forming a solid solution; the A element is selected from VII element, VIII, I At least one of element, II element, IIIA, IVA, VA and VIA group elements; X element is at least one of carbon, nitrogen, boron or oxygen element, n is 1, 2, 3, 4, 5 or 6

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