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Efficient electro-deposition preparation method and application of metal organic framework film

A metal-organic framework, electrodeposition technology, applied in the direction of electrolytic organic material coating, hybrid capacitor electrodes, etc., can solve problems such as substrate limitation, and achieve the effect of improving poor conductivity, high area specific capacitance, preventing agglomeration and structural collapse

Active Publication Date: 2022-04-19
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, metal electrode oxidation provides metal ions, so that the choice of substrate is limited

Method used

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  • Efficient electro-deposition preparation method and application of metal organic framework film
  • Efficient electro-deposition preparation method and application of metal organic framework film
  • Efficient electro-deposition preparation method and application of metal organic framework film

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for preparing a Co metal layer modified carbon cloth substrate electrodeposited Co-MOF film, comprising the following steps:

[0043] (1) Substrate pretreatment: Soak the carbon cloth substrate (1 cm × 2 cm) in acetone, deionized water and ethanol for 15 min and ultrasonically clean it, then H 2 SO 4 / HNO 3 (volume ratio 3:1) activated at 70 °C for 3 h, washed and dried for later use.

[0044] (2) Highly active metal layer modification: a two-electrode system was adopted, with treated carbon cloth as the working electrode (working area 1 cm×1 cm), platinum sheet as the counter electrode, cobalt sulfate (0.1 mol / L), The aqueous solution of sodium sulfate (0.2 mol / L) and boric acid (0.2 mol / L) is the electrolyte, the volume of the electrolyte is 50 mL, and the pH is 2.4. at −0.1 A / cm 2 Electrodeposition was performed at a constant current with a reaction time of 500 s, and a Co metal modification layer was formed on the surface of the carbon cloth. After the ...

Embodiment 2

[0047] A method for preparing a Co metal layer modified nickel foam substrate electrodeposited MOF film, wherein the highly active metal layer modification and the cathodic electrodeposition steps of the MOF film are the same as in Example 1, the difference lies in the selection and pretreatment of the substrate: this The example uses nickel foam as the substrate, and before use, it is ultrasonically cleaned in acetone, 1 mol / L hydrochloric acid, deionized water and ethanol for 15 minutes, and dried for use.

Embodiment 3

[0049] A kind of preparation method of Ni metal layer modification nickel foam substrate electrodeposited MOF film, comprises the following steps:

[0050] (1) Substrate pretreatment: the same as the substrate pretreatment steps in Example 2.

[0051] (2) Highly active metal layer modification: a two-electrode system was adopted, with the treated nickel foam as the working electrode (working area 1 cm×1 cm), platinum sheet as the counter electrode, and 50 mL of nickel chloride (0.1 mol / L ), an aqueous solution of potassium chloride (0.2 mol / L) and boric acid (0.2 mol / L) is the electrolyte. at −0.1 A / cm 2 Electrodeposition was performed at a constant current with a reaction time of 600s, and a metal Ni modification layer was deposited on the nickel foam substrate. After the deposition, it was cleaned with deionized water and ethanol.

[0052] (3) Cathodic electrodeposition of MOF film: The Ni metal layer modified nickel foam obtained in step (2) was used as the working electr...

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Abstract

The invention relates to a universal and efficient preparation method of a metal organic framework (MOF) membrane, which comprises the following steps: electrodepositing a high-activity metal layer as a substrate modification layer to provide active sites for nucleation and growth of the MOF membrane and enhance the interaction between the MOF and the substrate; and preparing a uniform and continuous MOF film on the surface of the modified substrate by adopting cathode electrodeposition. The preparation method is not limited by a conductive substrate, the problems that MOF and the surface of the substrate are incompatible and heterogeneous nucleation is difficult can be effectively solved, and the defects that the MOF is poor in conductivity and unstable in structure can be obviously overcome. The preparation method is simple, efficient and high in universality, and industrial popularization can be achieved. The MOF membrane prepared by the method not only shows good rate discharge performance and cycling stability in the aspect of supercapacitors, but also has good application prospects in the fields of batteries, catalysis, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of metal organic framework membrane preparation, and in particular relates to an active metal modification-assisted cathodic electrodeposition preparation method and application of metal organic framework membranes. Background technique [0002] Metal-organic frameworks (metal-organic frameworks, MOF) is a new type of porous crystalline material formed by the self-assembly of metal ions and organic molecules, because of its high specific surface area, high porosity, adjustable structure, high exposure of active sites and uniform dispersion, etc. Advantages, it has broad application prospects in the field of energy storage and conversion, and has become an emerging electrode material for supercapacitors (SCs). However, MOF materials generally have the problems of unstable structure and poor conductivity, which affect their rate and cycle stability. An effective way to solve the above problems is to grow MOF ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/02C25D3/12C25D3/20C25D3/54C25D5/54C25D5/36C25D5/40H01G11/24H01G11/30
CPCC25D9/02C25D3/12C25D3/20C25D3/54C25D5/54C25D5/36C25D5/40H01G11/24H01G11/30
Inventor 韩燕于跃崔健郑子朝李德军
Owner TIANJIN NORMAL UNIVERSITY
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