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Metal-organic framework nanosheet as well as preparation method and application thereof

A metal-organic framework and metal-organic technology, applied in the direction of nickel organic compounds, cobalt organic compounds, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of restricting large-scale use, restricting large-scale applications, and expensive prices etc. to achieve good film-forming properties, strong alkali resistance, and large specific surface area

Active Publication Date: 2016-07-06
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the best oxygen evolution catalyst is considered to be ruthenium or ruthenium oxide, but its large-scale application is greatly limited due to the high price.
In order to reduce the price, scientists have prepared transition metal oxides, hydroxides and perovskite compounds as electrocatalysts for electrochemical water oxidation. Although the price problem has been reduced to a certain extent, the large overpotential and low Efficiency still greatly limits their large-scale use

Method used

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  • Metal-organic framework nanosheet as well as preparation method and application thereof
  • Metal-organic framework nanosheet as well as preparation method and application thereof
  • Metal-organic framework nanosheet as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Dissolve terephthalic acid (2.5mmol) in 100mL of a solvent composed of DMF, water and ethanol (the volume ratio of DMF, water and ethanol is 1:1:1) to obtain a colorless and clear solution, add 0.75mmol (0.18g) CoCl 2 ·6H 2 O and 0.75mmol (0.18g) NiCl 2 ·6H 2 O. At room temperature, 0.1 mL of triethylamine was added dropwise, quickly transferred to ultrasonic conditions for 1 h, and the obtained light blue precipitate was washed 5 times with ethanol, and the color became milky white to obtain 0.72 g of the sample (yield 82%). The obtained powder was heated at 80°C for 30 min under a nitrogen atmosphere to remove guest molecules, and a guest-free metal-organic complex nanosheet was obtained, which was named UMOFNs-NiCo. The X-ray diffraction pattern of the product is shown in figure 1 , XRD shows that the material has four more obvious peaks, corresponding to the (200), (001), (201) and (-201) crystal planes of the crystal respectively; the scanning picture of the p...

Embodiment 2

[0084] Dissolve terephthalic acid (2.5mmol) in 100mL of a solvent composed of DMF, water and ethanol (the volume ratio of DMF, water and ethanol is 1:1:1) to obtain a colorless and clear solution, add 1.5mmol (0.36g) NiCl 2 ·6H 2 O. Under normal temperature conditions, 0.1mL triethylamine solution was added dropwise, quickly transferred to ultrasonic conditions for 1h, and the obtained light blue precipitate was washed with ethanol for 3-5 times, and the color became milky white to obtain 0.76g sample (yield 86 %). The obtained powder was heated at 80°C for 30 min under a nitrogen atmosphere to remove the guest molecules, and the guest-free metal-organic complex nanosheets were obtained, named UMOFNs-Ni. The X-ray diffraction pattern of the product is shown in figure 1 , XRD shows that the material has four more obvious peaks, corresponding to the (200), (001), (201) and (-201) crystal planes of the crystal respectively; the scanning picture of the product is shown in Fi...

Embodiment 3

[0091] Dissolve terephthalic acid (2.5 mmol) in 100 mL of a solvent consisting of DMF, water and ethanol (the volume ratio of DMF, water and ethanol is 1:1:1) to obtain a colorless and clear solution, and add 0.75 mmol CoCl 2 ·6H 2 O. Under normal temperature conditions, 5ml of KOH solution with a concentration of 1M was added dropwise, transferred to ultrasonic conditions for 1 h, and the obtained light blue precipitate was washed with ethanol for 3-5 times, and the color became milky white, and 0.68 g of sample (produced rate of 77%). The obtained powder was heated at 80°C for 30 min under a nitrogen atmosphere to remove guest molecules, and a guest-free metal-organic complex nanosheet was obtained, which was named UMOFNs-Co. The X-ray diffraction pattern of the product is shown in figure 1 , XRD shows that the material has four more obvious peaks, corresponding to the (200), (001), (201) and (-201) crystal planes of the crystal respectively; the scanning picture of the p...

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Abstract

The invention discloses a metal-organic framework nanosheet as well as a preparation method thereof and application thereof in oxygen evolution reaction of electrolysis water. According to the preparation method, the energy consumption is low, the reaction is rapid, reaction conditions are mild, the thickness of the obtained metal-organic framework nanosheet is 3nm-5nm, the specific surface area can reach 450m<2>.g<1>, and the alkali resistance and the chemical stability are good. The metal-organic framework nanosheet can be prepared into an electrolysis water oxygen production electrode, and a particular ultra-thin sheet structure can be in well contact with the surface of the electrode, so that influences on mass transfer, diffusion and material resistance in the electrochemical oxygen production process are overcome, the initial oxidation potential can reach 1.42V, and the overpotential at 10mA / cm<2> can reach 250mV. By virtue of a 24-hour test, the oxygen production effect is still maintained above 99.6%, the activity, stability and price of the metal-organic framework nanosheet are superior to those of traditional noble metal RuO2, and extremely high actual application value is achieved.

Description

technical field [0001] The invention belongs to the field of metal-organic framework complex porous materials, and relates to a metal-organic framework complex, a preparation method and its application, in particular to a metal-organic framework complex nanosheet, a preparation method and its application in electrolytic water oxygen evolution reaction application. Background technique [0002] Metal-organic framework complexes (Metal-Organic Framework, MOFs) are a new type of porous crystalline material with metal as the node and ligand as the framework. It has the characteristics of adjustable structure and composition, orderly channels, high specific surface area and low density. , has a wide range of applications in the fields of gas storage, separation, drug delivery and catalysis. Although there are more than 10,000 reported members of the MOFs family, there are less than ten kinds of MOFs nanosheets reported. In the prior art, MOFs nanosheets are usually prepared by h...

Claims

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Application Information

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IPC IPC(8): C07F19/00C07F15/04C07F15/06B01J31/22C25B1/04C25B11/06C25B11/12
CPCC25B1/04C07F15/045C07F15/065B01J31/223C25B11/095C25B11/043B01J35/615Y02E60/36
Inventor 赵慎龙唐智勇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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