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Bimetal nano hydroxide and oxide compound based on metal-organic framework and application of bimetal nano hydroxide and oxide compound in supercapacitor

A bimetallic nano, organic framework technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology for materials and surface science, etc., can solve the preparation of metal oxide and metal hydroxide composite materials Difficulties and other problems, to achieve the effect of enriching electrolyte ion diffusion channels, high capacitance performance, and increasing specific surface area

Active Publication Date: 2019-11-12
QINGDAO UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of difficulty in the preparation of metal oxide and metal hydroxide composite materials without derivatization of metal organic frameworks, the present invention uses metal nitrate cobalt nitrate and organic ligand 2-methylimidazole as raw materials to react in organic solvent methanol to obtain metal -organic framework, then with another metal nitrate (nickel nitrate) after treatment, then further with hypophosphite treatment to obtain a kind of bimetallic nano hydroxide with core-shell structure based on metal-organic framework and oxide complex

Method used

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  • Bimetal nano hydroxide and oxide compound based on metal-organic framework and application of bimetal nano hydroxide and oxide compound in supercapacitor
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  • Bimetal nano hydroxide and oxide compound based on metal-organic framework and application of bimetal nano hydroxide and oxide compound in supercapacitor

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Embodiment 1

[0045] A method for preparing a bimetallic nanohydroxide and an oxide compound based on a metal-organic framework, comprising the following steps:

[0046] (1) Preparation of metal-organic framework (ZIF-67): Weigh cobalt nitrate and 2-methylimidazole and dissolve them in 250 mL of organic solvent methanol according to the molar ratio of 1:4, in which 1mol of cobalt nitrate and 2-methylimidazole 4mol, stir to mix evenly, stand at room temperature for 24h, filter the above reaction solution, wash the precipitate with mother liquor, and dry at 70°C to obtain the required crystalline material metal-organic framework ZIF-67;

[0047] (2) Preparation of double metal hydroxide coated ZIF-67: Weigh 80mg ZIF-67 and disperse it in 128mgNi(NO 3 ) 2 anhydrous ethanol solution, vigorously stirred for 30min, the stirring rate was 500r / min, and centrifuged to obtain ZIF-67-LDH;

[0048] (3)α-Co / Ni(OH) 2 @Co 3 o 4 The preparation of -70: the ZIF-67 of step (2) gained double metal hydrox...

Embodiment 2

[0051] (1) The preparation of ZIF-67 metal-organic framework is the same as that in Example 1.

[0052] (2) The preparation of ZIF-67-LDH is the same as in Example 1.

[0053] The preparation of the active material electrode is the same as in Example 1.

Embodiment 3

[0055] (1) The preparation of ZIF-67 metal-organic framework is the same as that in Example 1.

[0056] (2) The preparation of ZIF-67-LDH is the same as in Example 1.

[0057] (3)α-Co / Ni(OH) 2 Preparation: The product obtained in step (2) was added with 64 μL of H 3 PO 2 32mgNaH 2 PO 4 The distilled aqueous solution was stirred for 1 hour and reacted at 70°C for 15 hours. The obtained precipitate was centrifuged, washed with deionized water and absolute ethanol three times, and dried at 70°C for 12 hours to obtain the target product.

[0058] The preparation of the active material electrode is the same as in Example 1.

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Abstract

The invention provides a preparation method of bimetal nano hydroxide and oxide with a hollow nano cage structure based on a metal-organic framework and a performance of a supercapacitor made of the bimetal nano hydroxide and oxide, and belongs to the technical field of new materials. The method comprises the steps: carrying out metal nitrate treatment on prepared ZIF-67, and further carrying outhypophosphite treatment to obtain the target product. The method is simple and convenient to operate, and high energy consumption caused by pyrolysis and other methods is avoided. In addition, the method can well control the morphology of a nano material to improve the capacity of a capacitor. According to the method, common MOFs are used as precursors to synthesize a bimetal nano hydroxide and oxide compound with specific nano morphology, and the synthesized nano material is applied to a capacitor electrode material, so that the method is further put into actual industrial production.

Description

【Technical field】 [0001] The invention belongs to the technical field of new materials, and in particular relates to a metal-organic framework-based bimetallic nanometer hydroxide and oxide composite and its application in supercapacitors. 【Background technique】 [0002] Metal-organic frameworks (Metal-organic Frameworks, MOFs) are a class of crystalline porous materials constructed by the self-assembly of metal ions and organic ligands. , so in recent years it has shown great application prospects in the field of electrode materials for capacitors. Transition metal oxides, hydroxides, and their composites derived from MOFs are widely used as electrode materials for capacitors based on their excellent performance in energy. In terms of electrochemical energy storage, metal hydroxides have high specific capacity, but the cycle stability is not strong, while metal oxides have good cycle stability, which can make up for the defects of metal hydroxides. Therefore, metal hydroxi...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/26H01G11/30H01G11/46H01G11/48B82Y30/00
CPCH01G11/86H01G11/24H01G11/26H01G11/30H01G11/46H01G11/48B82Y30/00Y02E60/13
Inventor 王磊鲍玉香肖振宇张琦郭自洋邓英
Owner QINGDAO UNIV OF SCI & TECH
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