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Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof

A technology of polyhedron and atom, which is applied in the field of Co atom-doped polyhedral MOFs materials and its preparation, can solve the problems of rare preparation of MOFs materials, low MOFs ORR activity, low energy density of zinc-air batteries, etc., and achieve excellent electrocatalytic activity , abundant reserves and low cost

Inactive Publication Date: 2021-09-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, it seems that zinc-air batteries still face many problems: (1) The actual energy density of zinc-air batteries is low due to the slow kinetic reaction rate of the positive electrode of zinc-air batteries; The uneven dissolution and deposition of zinc in the negative electrode leads to the growth of zinc dendrites; (3) the electrolyte of zinc-air batteries will interact with CO in the air 2 A reaction occurs that degrades the performance of the battery
[0005] Although there have been many methods for the preparation of electrocatalytic materials for Zn-air batteries, there are few MOFs materials supported by Co atoms, and the ORR activity of MOFs is not high, so it is difficult to be applied to Zn-air batteries.
In addition, the highly active MOFs materials prepared by the existing technology are relatively simple, and the MOFs materials loaded with single atom Co have not been reported yet.

Method used

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  • Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof
  • Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof
  • Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof

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preparation example Construction

[0038] An embodiment of the present invention provides a method for preparing a Co atom-doped polyhedral MOFs material, comprising the following steps:

[0039] (1) Add dimethylimidazole, zinc salt and cobalt salt to the methanol solution for precursor synthesis reaction, and the reaction product is separated and dried to obtain the precursor powder;

[0040] (2) Roasting dicyandiamide to prepare g-C 3 N 4 powder;

[0041] (3) Combine the precursor powder and g-C 3 N 4 The powder is ground and mixed uniformly to obtain a mixed powder, and the mixed powder is placed in an inert atmosphere for calcination;

[0042] (4) The product obtained after the calcination treatment is acid-washed with sulfuric acid, dried after solid-liquid separation, and the Co atom-doped polyhedral MOFs material is obtained.

[0043] Among them, in the precursor synthesis reaction in step (1), the zinc salt and cobalt salt can be commonly used water-soluble salts, and the zinc salt can be zinc nitr...

Embodiment 1

[0053] Embodiment 1 of the present invention provides a Co atom-doped polyhedral MOFs material and a preparation method thereof, comprising the following steps:

[0054] (1) At a room temperature of 25 °C, put zinc nitrate hexahydrate and cobalt nitrate hexahydrate in a molar ratio of 2:1 into methanol solution and stir for 24 hours. After the reaction, the product was centrifuged and dried to obtain the precursor powder;

[0055] (2) Put 5.5 g of dicyandiamide into a muffle furnace for calcination, raise the temperature to 550 ℃ at 2 ℃ / min, and roast at this temperature for 2 h to obtain g-C 3 N 4 powder;

[0056] (3) The precursor powder of step (1) and the g-C of step (2) 3 N 4 The powder was mixed evenly in a mortar at a mass ratio of 1:2, ground for 20 minutes, and then placed in a tube furnace for calcination at 900 °C (increased at 2 °C / min to 900 °C) for 3 h, and the calcination atmosphere was nitrogen to obtain ZIF-Zn :Co-2:1;

[0057] (4) Wash ZIF-Zn:Co-2:1 with...

Embodiment 2

[0059] Embodiment 2 of the present invention provides a Co atom-doped polyhedral MOFs material and a preparation method thereof, comprising the following steps:

[0060] (1) At room temperature of 28 °C, zinc nitrate hexahydrate and cobalt nitrate hexahydrate were put into methanol solution with a molar ratio of 4:1 and stirred for 22 hours. After the reaction, the product was centrifuged and dried to obtain the precursor powder;

[0061] (2) Put 5.5 g of dicyandiamide into a muffle furnace for calcination, raise the temperature to 520 ℃ at 2 ℃ / min, and roast at this temperature for 3 h to obtain g-C 3 N 4 powder;

[0062] (3) The precursor powder of step (1) and the g-C of step (2) 3 N 4 The powder was mixed evenly in a mortar at a mass ratio of 1:2, ground for 20 min, and then placed in a tube furnace for calcination at 850 °C (increased at 2 °C / min to 850 °C) for 4 h, and the calcination atmosphere was nitrogen to obtain ZIF-Zn :Co-4:1;

[0063] (4) Wash ZIF-Zn:Co-4:1 ...

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Abstract

The invention provides a Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as a preparation method and application thereof. The preparation method of the Co atom-doped polyhedral MOFs material comprises the following steps: adding dimethylimidazole, a zinc salt and a cobalt salt into a methanol solution to carry out a precursor synthesis reaction, and separating and drying a reaction product to obtain precursor powder; subjecting dicyandiamide to roasting treatment, and preparing g-C3N4 powder; grinding and uniformly mixing the precursor powder and the g-C3N4 powder to obtain mixed powder, and calcining the mixed powder in an inert atmosphere; subjecting a product obtained after calcination treatment to acid pickling with sulfuric acid, conducting solid-liquid separation, then drying, and obtaining the Co atom doped polyhedral MOFs material. The Co atom-doped polyhedral MOFs material prepared by the preparation method disclosed by the invention is relatively high in nitrogen content and relatively large in specific surface area, can be used as an electro-catalytic material of a zinc-air battery, and has more excellent electro-catalytic activity than a commercial 40% Pt / C catalyst.

Description

technical field [0001] The invention belongs to the technical field of zinc-air battery materials, and in particular relates to a Co atom-doped polyhedral MOFs material and a preparation method and application thereof. Background technique [0002] Environmental pollution and energy scarcity make the development of new energy more and more imminent, coupled with the huge electricity demand of electric vehicles and power grids, these factors have greatly promoted the high energy density, low-carbon environmental protection and the earth, including zinc-air batteries. The rapid development of energy storage equipment with abundant reserves. Due to its high theoretical power density, abundant Zn reserves on the earth, and safe use, zinc-air batteries are very promising to become leaders in energy storage devices in the future social development. But at present, it seems that zinc-air batteries still face many problems: (1) The actual energy density of zinc-air batteries is low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08B01J20/02B01J20/22B01J20/28B01J27/24B01J35/00B01J35/10B01J37/08
CPCH01M4/9041H01M4/9075H01M12/08B01J27/24B01J37/086B01J20/226B01J20/28083B01J20/28085B01J20/02B01J35/33B01J35/617B01J35/615
Inventor 高云芳吴佳豪武海华徐新
Owner ZHEJIANG UNIV OF TECH
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