Method for preparing three-dimensional structure Co-MOF/NF supercapacitor electrode material in situ based on foamed nickel

A technology for supercapacitors and electrode materials, applied in the field of electrochemical energy storage, can solve problems such as large contact resistance, insufficient application of active materials, cumbersome electrode preparation process, etc., to reduce contact resistance and simplify the preparation process Easy operation and short reaction cycle

Inactive Publication Date: 2018-09-04
SICHUAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The technical problem mainly solved by the present invention is to overcome the disadvantages of large contact resistance brought by powder electrode materials, insufficient application of active materials, cumbersome electrode p

Method used

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  • Method for preparing three-dimensional structure Co-MOF/NF supercapacitor electrode material in situ based on foamed nickel
  • Method for preparing three-dimensional structure Co-MOF/NF supercapacitor electrode material in situ based on foamed nickel
  • Method for preparing three-dimensional structure Co-MOF/NF supercapacitor electrode material in situ based on foamed nickel

Examples

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example 1

[0023] (1) Material preparation: 0.291 g cobalt nitrate hexahydrate and 0.166 g terephthalic acid, the molar ratio is 1:1, measure 35 mL N,N-dimethylformamide as solvent, 5 mL absolute ethanol as additive, One piece measures 2×3 cm 2 Nickel foam was pretreated with ethanol, 5% dilute hydrochloric acid and deionized water for 10 min respectively;

[0024] (2) Reaction: Pour the above prepared solution into a 50 mL polytetrafluoroethylene autoclave, then put a piece of processed nickel foam into the autoclave, seal the autoclave, place it in an oven, and Reaction at 125 ℃ for 12 h;

[0025] (3) Washing: After the reaction is completed, cool the polytetrafluoroethylene autoclave to room temperature in the air, take out the nickel foam evenly covered by the dark yellow substance, and wash it with N,N-dimethylformamide and absolute ethanol respectively. rinse three times;

[0026] (4) Drying: The washed product was vacuum-dried at 60 °C for 8 h to obtain the Co-MOF / NF electrode ...

example 2

[0029] (1) Material preparation: 0.582 g cobalt nitrate hexahydrate and 0.332 g terephthalic acid, the molar ratio is 1:1, measure 70 mL N,N-dimethylformamide as solvent, and 10 mL absolute ethanol as additive , a piece with a size of 2×3 cm 2 Nickel foam was pretreated with ethanol, 5% dilute hydrochloric acid and deionized water for 10 min respectively;

[0030] (2) Reaction: Pour the above-mentioned prepared solution into two 100mL polytetrafluoroethylene autoclaves, then put the pre-treated foamed nickel into the autoclave, and seal the autoclave, place it in the oven, React at 125 °C for 12 h;

[0031] (3) Washing: After the reaction is completed, cool the polytetrafluoroethylene autoclave to room temperature in the air, take out the nickel foam evenly covered by the dark yellow substance, and wash it with N,N-dimethylformamide and absolute ethanol respectively. rinse three times;

[0032] (4) Drying: The washed product was vacuum-dried at 60 °C for 8 h to obtain the C...

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Abstract

The invention discloses a simple, easy-to-operate and environmentally friendly method for synthesizing a three-dimensional structure Co-MOF/NF material in situ. With a cobalt nitrate hexahydrate adopted as a cobalt source, terephthalic acid as an organic ligand, N,N-dimethylformamide as a solvent, absolute ethyl alcohol as an additive, and foamed nickel as a substrate, a one-step solvothermal method is adopted to obtain Co-MOF/NF; when being used as supercapacitor self-supporting electrode material, the Co-MOF/NF exhibits ultra-high area ratio capacitance (13.6 F cm<-2>), the performance of the Co-MOF/NF is far superior to the performance of previously reported MOF-based materials. With the method of the invention adopted, problems such as large contact resistance, insufficient applicationof active materials, and complex electrode preparation processes which are caused by the application of powder electrode materials can be solved. The Co-MOF/NF material is a novel energy storage material which has the advantages of ultra-high area specific capacitance, excellent rate performance and low cost.

Description

technical field [0001] The invention relates to the in-situ preparation of Co-MOF / NF with a three-dimensional structure on nickel foam (NF) by cobalt-based-metal-organic framework (Co-MOF), and the application of the material in the field of electrochemical energy storage. High-performance Co-MOF / NF supercapacitor electrode materials can be prepared by only a simple and environmentally friendly one-step solvothermal method. Background technique [0002] Metal-organic framework (MOF) is a crystalline material with a porous network structure formed by coordination between metal ions or metal oxide clusters and organic ligands. It has various structures, high porosity, large specific surface area, and easy function It is favored in many fields such as gas adsorption or storage, drug separation, optoelectronics, and catalysis ( J. Mater. Chem. A, 2016, April, 19078–19085; ACS Appl. Mater. Interfaces, 2016, 8, 4585−4591.). In recent years, it has also been gradually applied...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/86H01G11/26
CPCY02E60/13H01G11/30H01G11/26H01G11/86
Inventor 姚亚东马敏王伟怡
Owner SICHUAN UNIV
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