Ultrathin nanosheet material with coexisting crystal and amorphous interfaces and water electrolysis application of ultrathin nanosheet material

A nanosheet and amorphous technology, applied in the field of preparation and ultrathin nanosheet materials, can solve the problems of high energy consumption, damage to the metal center coordination of MOFs, and difficulty in electrocatalysis of MOFs, so as to promote the conversion process and promote full exposure. and the effect of fast charge/electron transfer

Active Publication Date: 2021-03-05
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pyrolysis strategy generally requires high-temperature treatment and high energy consumption, which will destroy the coordination around the metal center inside MOFs and reduce the exposure of active sites, making it difficult to make full use of MOFs for electrocatalysis.

Method used

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  • Ultrathin nanosheet material with coexisting crystal and amorphous interfaces and water electrolysis application of ultrathin nanosheet material
  • Ultrathin nanosheet material with coexisting crystal and amorphous interfaces and water electrolysis application of ultrathin nanosheet material
  • Ultrathin nanosheet material with coexisting crystal and amorphous interfaces and water electrolysis application of ultrathin nanosheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The preparation process of Ni-ZIF / Ni-B-4@NF electrocatalyst is as follows:

[0039] 1) Cut out nickel foam (1cm×2cm), use acetone, ethanol, and deionized water to sonicate for 5 minutes, and use it as a substrate after drying in a 60°C oven.

[0040] 2) 10mL Ni(NO 3 ) 2 ·6H 2 O (580 mg) methanol solution was added to 20 mL dimethylimidazole (660 mg) methanol solution, and the obtained solution was sonicated for 1 minute until the solution was mixed uniformly. The solution was transferred to a 50mL reactor, put into the treated foamed nickel substrate, and reacted hydrothermally at 180°C for 6 hours. Finally, the precursor obtained by the reaction was rinsed with deionized water, and dried in an oven at 60° C. for 12 hours.

[0041] 3) Take 1.8915g of sodium borohydride and dissolve it in 50mL of deionized water, put it into the precursor nickel foam, and control the boronation time to 4 hours. After the reaction, the product was taken out, rinsed with deionized wate...

Embodiment 2

[0053] In this example, the boronization time was controlled to be 2 hours, and the rest was the same as in Example 1 to prepare Ni-ZIF / Ni-B-2@NF electrocatalyst.

Embodiment 3

[0055] In this example, the boronization time was controlled to be 9 hours, and the rest was the same as in Example 1 to prepare Ni-ZIF / Ni-B-9@NF electrocatalyst.

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Abstract

The invention relates to an ultrathin nanosheet material with coexisting crystal and amorphous interface and application of the material. A preparation method of the material comprises the following steps: 1) pretreating foamed nickel, and taking the pretreated foamed nickel as a matrix; 2) mixing a nickel nitrate solution with a dimethylimidazole solution to obtain a mixed solution; 3) putting the matrix into the mixed solution, and carrying out hydrothermal reaction to obtain a nickel-based zeolite imidazate skeleton; and 4) washing and drying the nickel-based zeolite imidazate skeleton, putting the nickel-based zeolite imidazate skeleton into a sodium borohydride solution, and carrying out a boronation reaction to obtain the crystal and amorphous interface coexisting ultrathin nanosheetmaterial. The material is used as a catalyst for water electrolysis reaction. Compared with the prior art, the crystal and amorphous interface coexisting ultrathin nanosheet electrocatalyst materialprepared by the invention not only has excellent electrocatalytic performance and multiple active sites, but also is low in cost, can be used for carrying out stable and efficient hydrogen evolution reaction, oxygen evolution reaction and total water decomposition under different current densities, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and relates to an ultra-thin nanosheet material with coexistence of crystal and amorphous interfaces, its preparation and application. Background technique [0002] The depletion of fossil fuels and emerging environmental issues are driving the rapid development of hydrogen energy. Hydrogen has become one of the most promising energy carriers due to its high-quality energy density and no carbon emissions. Electrochemical water splitting, when combined with other intermittent energy sources such as wind and solar energy, offers a green, sustainable method for hydrogen fuel production. During water electrolysis, two electrode half-reactions mainly occur, namely hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). However, due to the existence of energy barriers in the thermodynamic and kinetic processes of these two half-reactions, a high overpotential is required t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/28B01J37/34B01J37/10B82Y30/00B82Y40/00C08G83/00C25B11/095C25B11/085C25B1/04
CPCB01J31/181B01J31/28B01J35/0033B01J37/10B01J37/343B82Y30/00B82Y40/00C08G83/008C25B1/04C25B11/04Y02E60/36
Inventor 吴仁兵费奔徐鸿彬
Owner FUDAN UNIV
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