Ultrathin Ni-Fe-MOF nanosheet, preparation method and application thereof

A nano-sheet and ultra-thin technology, applied in the field of ultra-thin Ni-Fe-MOF nano-sheets and its preparation, can solve the problems of difficult removal of surfactants, difficulty of 2D ultra-thin MOF nano-sheets, etc., and achieve excellent catalytic performance, Uniform shape and high yield

Active Publication Date: 2019-01-25
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional "bottom-up" synthesis strategy often requires the assistance of substrate materials and surfactants (see J. Duan, S. Chen, C. Zhao, Nat. Commun. 2017, 8, 15341-15348; M.Jahan, Z.Liu, K.P.Loh, Adv.Funct.Mat er.2013, 23, 5363-5372; M.Zhao, Y.Wang, Q.Ma, Y.Huang, X.Zhang, J.Ping, Z.Zhang, Q.Lu, Y.Yu, H.Xu, Y.Zhao, H.Zhang, Adv.Mater.2015, 27, 7372-7378), it is still difficult to prepare dispersed 2D ultrathin MOF nanosheets, Moreover, the residual surfactant in the product is difficult to remove, which limits the application of this type of material to a large extent.

Method used

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  • Ultrathin Ni-Fe-MOF nanosheet, preparation method and application thereof
  • Ultrathin Ni-Fe-MOF nanosheet, preparation method and application thereof
  • Ultrathin Ni-Fe-MOF nanosheet, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Preparation of ultrathin Ni-Fe-MOF nanosheets

[0045] Weigh respectively 24.8mg (0.1mmol) of nickel acetate tetrahydrate and 7.38mg (0.03mmol) of ferrous sulfate heptahydrate solid dissolved in 6mL deionized water to form solution A, and weigh 8.3mg of organic ligand terephthalic acid Dissolve in 6mL DMAC to form solution B. Slowly add solution B to solution A and mix evenly under stirring conditions, then transfer the mixed solution into a stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it and place it in an oven , reacted at 150°C for 3 h, cooled naturally to room temperature after the reaction, washed with deionized water and ethanol, centrifuged and dried to obtain yellow powder ultrathin Ni-Fe-MOF nanosheets, abbreviated as Ni- Fe-MOF NSs.

[0046] Such as figure 1 and figure 2 As shown, the ultrathin Ni-Fe-MOF nanosheets have uniform morphology and high quality and yield.

[0047] Such as image 3 As shown, the powder d...

Embodiment 2

[0058] Example 2: Mass preparation of ultrathin Ni-Fe-MOF nanosheets

[0059] Weigh 2.48g (10mmol) of nickel acetate tetrahydrate and 0.738g (3mmol) of ferrous sulfate heptahydrate solid and dissolve them in 300mL deionized water to form solution A, and weigh 0.830g (5mmol) of the organic ligand terephthalate Dissolve formic acid in 300mL DMAC to form solution B. Slowly add solution B to solution A and mix evenly under stirring conditions, then transfer the mixed solution into a 1000mL thick-walled reaction bottle, seal it and place it in an oven at 150°C The reaction was carried out for 3 hours. After the reaction, it was naturally cooled to room temperature, washed with deionized water and ethanol, centrifuged and dried to obtain yellow powdery ultrathin Ni-Fe-MOF nanosheets with a mass of 1.7486g, such as Figure 12 shown.

[0060] Such as Figure 13 As shown, the mass-synthesized ultrathin Ni-Fe-MOF nanosheets have uniform morphology and high quality and yield.

[0061]...

Embodiment 3

[0062] Embodiment 3: the preparation of electrocatalyst

[0063] Weigh 2.5 mg of ultra-thin Ni-Fe-MOF nanosheet solid powder and 2.5 mg of commercial carbon black for mixing, add 970 μL of isopropanol and 30 μL of 5wt.% Nafion solution, and ultrasonically disperse it for 1 h to form an ink-like solution . Take 20 μL of the above solution and add it dropwise to the surface of the polished glassy carbon electrode in batches, and let it dry naturally before use.

[0064] As a comparison, 2.5 mg of Ni-MOF solid powder and 2.5 mg of commercial carbon black were weighed and mixed, 970 μL of isopropanol and 30 μL of 5 wt.% Nafion solution were added, and ultrasonically dispersed for 1 h to form an ink-like solution. Take 20 μL of the above solution and add it dropwise to the surface of the polished glassy carbon electrode in batches, and let it dry naturally before use.

[0065] As a comparison, weigh 5.0 mg of commercial Ir / C (5wt.% Ir), add 970 μL of isopropanol and 30 μL of 5wt....

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Abstract

The invention discloses a preparation method of an ultrathin Ni-Fe-MOF nanosheet. The preparation method comprises the following steps of dissolving an organic ligand in an organic solvent, dripping the obtained solution into a water solution with nickel and iron salts dissolved, mixing uniformly, then reacting for 3-6 hours at 140-160 DEG C, so as to obtain the ultrathin Ni-Fe-MOF nanosheet, wherein the organic ligand is p-phthalic acid and / or disodium terephthalate, and the organic solvent is N,N-dimethylacetamide and / or N,N-dimethylformamide. The invention further discloses the ultrathin Ni-Fe-MOF nanosheet and application thereof. The preparation method needs no surfactant, and can synthesize a large quantity of 2D ultrathin MOF material. The product has a clean surface and is easy toclean.

Description

technical field [0001] The invention relates to the technical field of metal organic framework materials, in particular to an ultra-thin Ni-Fe-MOF nanosheet and its preparation method and application. Background technique [0002] With the excessive use of petroleum resources, energy depletion and environmental pollution have become increasingly serious, hydrogen has attracted much attention as a clean energy. Efficient energy conversion and storage systems have become the focus of current research, such as fuel cells and electrolyzed water in the field of electrochemistry, among which the production of hydrogen through electrolyzed water has high research value in theory, and the oxygen evolution reaction (4OH - →2H 2 O+O 2 +4e - ) as one of the important half-reactions, its slow kinetics often limits the overall efficiency of the system. Most of the current electrocatalysts are based on noble metal materials. For non-noble metals, especially nickel-iron-based materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04C08G83/00
CPCC25B1/04C08G83/008C25B11/075C25B11/02C25B11/052C25B11/095C25B11/085C07F15/04B82Y40/00
Inventor 郎建平李飞龙黄小青倪春燕
Owner SUZHOU UNIV
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