Preparation method and application of metal organic framework carbon fiber composite film

Abstract

The invention discloses a preparation method and application of a metal organic framework carbon fiber composite film. The method comprises the steps of (1) dissolving a high molecular polymer in a solvent as a spinning solution and stirring at the temperature of 40 to 85 DEG C for 10 to 30 hours to fully dissolving the high molecular polymer to obtain a solution A, (2) performing electrostatic spinning on the solution A to obtain a polymer nanofiber film, pre-oxidizing the polymer nanofiber film, sintering the polymer nanofiber film in an inert gas, and drying to obtain a CNF film, (3) placing the CNF film obtained in step (2) in a mixed gas of ozone and oxygen to form a functionalized CNF film, and (4) placing the functionalized CNF film in a metal salt solution, then placing the functionalized CNF film in an organic ligand solution, washing and drying, and forming a MOF / CNF composite film after a certain number of cycles. The MOF / CNF composite film provided by the invention is prepared by an electrostatic spinning method and has the characteristics of easy obtainment of raw materials, low price, and easy mass production.

Description

technical field [0001] The invention relates to the technical field of polymer chemical film production, in particular to a preparation method and application of a metal-organic framework carbon fiber composite film. Background technique [0002] Metal-organic framework (MOF) refers to a crystalline porous material with a periodic network structure formed by self-assembly of transition metal ions and organic ligands. MOF and its derivatives have a unique three-dimensional micro-nanoporous structure and ultra-high specific surface area. At the same time, heteroatoms such as N and S in transition metal ions and organic ligands can provide enough active sites to be used in supercapacitor electrodes. Materials have broad application prospects. However, based on the intrinsic driving force of crystal growth, MOFs synthesized by conventional methods are generally granular and difficult to change. In practical applications, there are still some difficult problems to solve: [00...

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Problems solved by technology

[0003] (1) The interior of MOF is mostly microporous structure, and the electrolyte transfer resistance is relatively large, which limits its rate performance at high current density;

[0004] (2) MOF particles are easy to agglomerate, which leads to a rapid decrease in the active specific surface area, which in turn affects the discharge capacity;

[0005] (3) MOF crystals usually have a polyhedral structure, and the size and shape of the crystal particles have a greater impact on the electrochemical performance. For larger particles, the internal pores are difficult to be infiltrated by the electrolyte, and the electrode utilization is low;

[0006] (4) MOF particles are often poorly conductive, which improves the ohmic polarization inside the supercapacitor;

[0007] (5) During the electrode preparation process, it is necessary to add a binder to make it bonded into a sheet, which increases the extra mass of the electrode and covers part of the surface active sites, thereby reducing the overall performance of the electrode.

[0009] Although the electrochemical performance of MOF electrodes can be significantly improved by using the above-mentioned electrode materials, such methods are mainly based on the simple composite of two materials, and lack of rational design of the morphology, structure, and size of the resulting composite materials. At the same time, in the electrode The addition of binder is still required in the preparation process of the material, and the electrochemical performance still needs to be improved

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