Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt

A metal-organic framework, metal salt technology, applied in rayon manufacturing, fiber chemical characteristics, electrical components, etc., can solve the obstacles that hinder the large-scale production and industrial application of MOF materials, large-scale commercial application limitations, and expensive layer deposition methods. To achieve the effect of enriching high active sites, reducing production costs and safety hazards, and improving electrocatalytic performance

Active Publication Date: 2021-06-29
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

Among them, the secondary growth and in-situ crystallization methods consume a large amount of solution and generate a large amount of waste liquid, which greatly hinders the large

Method used

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  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt
  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt
  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt

Examples

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Example Embodiment

[0028] The present invention provides a method for preparing a metal salt assisted rapid growth metal organic skeleton derivative.

[0029] In this method, the metal salt and the polymer polymer are first added to the organic solvent, thoroughly stirring to obtain a mixed solution, using electrospinning techniques to obtain a metal salt / polymer nanofiber film, and then containing the metal organic skeleton MOF growth requires an organic part required for growth The body solution is evenly coated on the metal salt / polymer nanofiber film, and then the metal ions in the nanofibers are combined with the chemical bonds in the nanofibers by hot pressing techniques, so that the MOF material is uniformly grown on the nanofibers. MOF / Nano The fiber membrane is calcined under an inert gas to form a metal embedded nitrogen doped porous carbon nanofibers.

[0030] Such as figure 1 As shown, the specifically includes the steps as follows:

[0031] (1) The metal salt of the synthesis targ...

Example Embodiment

[0035] Example 1

[0036] First, a metal salt / polyacrylonitrile (PAN) nanofiber film is prepared

[0037] 1.0 g of polyacrylonitrile (PAN) and 1.0 g of cobalt cobalt were added to 10 ml of dimethylformamide solution, and magnetically stirred at room temperature for 10 h to form a homogeneous spinning solution. The spunmine is transferred to a 10 ml syringe and placed on the injection pump to obtain a cobalt-polyacrylonitrile (PAN) nanofiber film by electrospinning techniques. The spinning applied voltage is 12-20 kV, the injection pump feed speed is 0.6 ml / h, the distance between the needle and the roller receiver is 20 cm, the syringe needle is 19 #.

[0038] In the second step, the ZIF-8 / PAN nanofiber film was prepared

[0039] Such as figure 1 As shown, 0.35 g of dimethylimidazole (2-meim) and 5 mL of polyethylene glycol (PEG200) were placed in a mortar and coated on a cobalt / polyacrylonitrile (PAN) nanofiber film. The hot pressing temperature is set to 80 ° C to 1220 °...

Example Embodiment

[0042] Example 2

[0043] The first step is prepared for bimetallic salt / polyacrylonitrile (PAN) nanofibers:

[0044] 1.0 g of polyacrylonitrile, 0.47 g of acetate, 0.53 g of zinc acetate was added to 10 ml of dimethylformamide solution, and magnetic stirring was stirred at room temperature for 10 h to form a uniform spinning solution. The above-mentioned spinning fluid was transferred into the 10 ml syringe and placed on the injection pump to obtain a cobalt acetate-acetate / PAN nanofiber film by electrostatic spinning techniques. The spinning applied voltage is 12-20 kV, the injection pump feed speed is 0.6 ml / h, the distance between the needle and the roller receiver is 20 cm, the syringe needle is 19 #.

[0045] Step 2, prepare bimetal organic skeleton (BMZIF) / PAN nanofiber film

[0046] 0.35 g of dimethylimidazole (2-meim) and 5 mL of polyethylene glycol (PEG200) were placed in a mortar, and then coated on zinc-zinc / acetate / polyacrylonitrile (PAN) nanofiber film The...

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Abstract

The invention provides a preparation method for rapidly growing a metal organic framework derivative with assistance of a metal salt, and belongs to the technical field of nano material preparation and fuel cell catalysis. The preparation method comprises the following steps of: firstly, adding the metal salt and a high-molecular polymer into an organic solvent, stirring to obtain a mixed solution, acquiring a metal salt/high-molecular nanofiber membrane by adopting an electrostatic spinning technology, and then uniformly coating the metal salt/high-molecular nanofiber membrane with an organic ligand solution required by the growth of the MOF; and secondly, achieving chemical bond combination of metal ions and ligands in nanofibers through adopting a hot pressing technology, so that the MOF material compactly and evenly grows on the nanofiber membrane, and the MOF/nanofiber membrane is calcined under inert gas to form the metal-embedded nitrogen-doped porous carbon nanofibers. According to the preparation method, solvents such as methanol, ethanol and water are not used in the preparation process, and the method is short in preparation time, simple in process, environment-friendly and suitable for large-scale production and has important application value in the fields of energy catalysis and environmental protection.

Description

technical field [0001] The invention relates to the technical fields of nanomaterial preparation and fuel cell catalysis, in particular to a method for preparing a metal-salt-assisted rapid growth metal-organic framework derivative. Background technique [0002] The development of highly active non-precious metal-based catalysts to replace traditional expensive platinum-based catalysts is crucial and has been faced with numerous challenges. Studies have shown that high specific surface area, hierarchical pore structure, high active sites, uniform heteroatom doping, and high electrical conductivity are the key factors to obtain excellent electrocatalytic performance. Metal-organic frameworks (MOFs) with supramolecular structures, composed of metal ions and organic ligands, can be transformed into porous carbons with high specific surface area, high active sites, and uniform heteroatom decoration by simple carbonization in an inert atmosphere. Based on the above factors, elec...

Claims

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Application Information

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IPC IPC(8): H01M4/90D01F9/22D01F1/10D06M15/37C08G83/00D06M101/28
CPCH01M4/9008H01M4/9083D01F9/22D01F1/10D06M15/37C08G83/008D06M2101/28Y02E60/50
Inventor 张秀玲李从举彭利冲
Owner UNIV OF SCI & TECH BEIJING
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