Aperture-controllable honeycomb three-dimensional porous MXene and general synthesis method thereof

Abstract

The invention discloses an aperture-controllable honeycomb three-dimensional porous MXene and a general synthesis method thereof, and belongs to the field of nano materials. According to the method, two-dimensional transition metal carbide MXene and a corresponding polymer template are used as precursors, and the honeycomb three-dimensional porous transition metal carbide with the controllable internal pore size is prepared through a spray pyrolysis technology. The honeycomb three-dimensional porous transition metal carbide prepared by the method is of a hierarchical porous three-dimensional structure formed by three-dimensional tight crosslinking of the two-dimensional MXene, the pore size is 260-800 nm, the pyrolysis time is extremely short, and the honeycomb three-dimensional porous transition metal carbide has excellent conductivity and has the specific surface area and pore volume far exceeding those of the two-dimensional MXene; the porosity and the ion permeability are greatly improved, so that an MXene surface interface is efficiently utilized, the application and processing properties of the MXene surface interface are improved, and the disclosed MXene has a wide application prospect in the fields of catalysis, energy, photoelectricity, space technology, war industry and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and relates to a honeycomb three-dimensional porous MXene with controllable aperture and a general synthesis method thereof. Background technique [0002] Due to the size effect, nanomaterials have much better physical and chemical properties than macroscopic bulk materials, so they have attracted extensive attention. The performance of functional nanomaterials largely depends on their morphology, size, and crystal phase structure. It has become a hot field of scientific research on nanomaterials in recent years to fine-tune their microstructure to realize structural design and controllable construction. [0003] MXene is a new type of transition metal carbide or nitride two-dimensional crystal obtained by acid etching the MAX phase of layered ceramic materials. Its chemical formula is M n+1 x n , (n=1, 2, 3, M is a transition metal element, X is carbon or nitrogen). where Ti 3 C 2 As a kind of...

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Problems solved by technology

[0004] The two-dimensional nanostructure of MXene endows it with unique properties, but the small specific surface area and lack of pore structure of MXene sheets make it prone to irreversible stacking and agglomeration during processing, which greatly reduces its specific surface area and pore size. The efficiency and ion permeability limit the efficient use of its surface interface, which seriously affects and limits its application and processing performance in various fields.

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