Preparation method of highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material

A nanosheet array, supercapacitor technology, applied in hybrid capacitor electrodes, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of low cycle stability, tedious electrode preparation process, orientation and poor conductivity

Inactive Publication Date: 2020-12-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem mainly solved by the present invention is to overcome defects such as large contact resistance brought by general electrode materials, cumbersome electrode preparation process, small specific surface area that can be in contact with electrolyte, low cycle stability, etc., and avoid the defects of general MOFs based Due to the disadvantages of low utilization of active sites and reduced catalytic activity due to poor orientation and electrical conductivity of the material, the Mn-doped Ni-MOF material is directly grown in situ on a conductive substrate to prepare a three-dimensional highly regular array of nano-arrays Structured electrode material, using its ultra-thin nanosheet structure and the synergistic effect between various metals, as a supercapacitor electrode material, shows extremely high electrochemical energy storage properties

Method used

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  • Preparation method of highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material
  • Preparation method of highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material
  • Preparation method of highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material

Examples

Experimental program
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Effect test

example 1

[0022] (1) Material preparation: MnCl 2 4H 2 O (0.45 mmol), Ni (NO 3 ) 2 6H 2 O (4.05 mmol), CO (NH 2 ) 2 (20 mmol) and NH 4 F (8 mmol), dissolved in 80 mL ultrapure water, stirred evenly, take a piece with a size of 4×6 cm 2 Nickel foam (NF) was pretreated with absolute ethanol, 5% dilute hydrochloric acid and deionized water for 10 min respectively;

[0023] (2) Hydrothermal reaction: Move the solution in step (1) and the treated NF into a 100 mL polytetrafluoroethylene-lined stainless autoclave, and seal the autoclave, place it in an oven at 120 °C Reaction for 6 h;

[0024] (3) Washing and drying: After the reaction in step (2) is completed, place the polytetrafluoroethylene autoclave in the air to cool to room temperature, take out the NF evenly covered by the product, wash it with deionized water and ethanol several times, and place it in the Dry in an oven at 70 °C for 3 hours to prepare the MnNi-LDH / NF precursor;

[0025] (4) Material preparation: C 8 h 4...

example 2

[0030] (1) Material preparation: MnCl 2 4H 2 O (0.225 mmol), Ni (NO 3 ) 2 6H 2 O (2.025 mmol), CO (NH 2 ) 2 (10 mmol) and NH 4 F (4 mmol), dissolved in 40 mL ultrapure water, stirred evenly, take a piece with a size of 2×3 cm 2 Nickel foam (NF) was pretreated with absolute ethanol, 5% dilute hydrochloric acid and deionized water for 10 min respectively;

[0031] (2) Hydrothermal reaction: Move the solution in step (1) and the treated NF into a 50 mL polytetrafluoroethylene-lined stainless autoclave, and seal the autoclave, place it in an oven at 120 °C Reaction for 6 h;

[0032] (3) Washing and drying: After the reaction in step (2) is completed, place the polytetrafluoroethylene autoclave in the air to cool to room temperature, take out the NF evenly covered by the product, wash it with deionized water and ethanol several times, and place it in the Dry in an oven at 70 °C for 3 hours to prepare the MnNi-LDH / NF precursor;

[0033] (4) Material preparation: C 8 h ...

example 3

[0038] (1) Material preparation: MnCl 2 4H 2 O (0.45 mmol), Ni (NO 3 ) 2 6H 2 O (4.05 mmol), CO (NH 2 ) 2 (20 mmol) and NH 4 F (8 mmol), dissolved in 80 mL ultrapure water, stirred evenly, take a piece with a size of 4×6 cm 2 Nickel foam (NF) was pretreated with absolute ethanol, 5% dilute hydrochloric acid and deionized water for 10 min respectively;

[0039] (2) Hydrothermal reaction: Move the solution in step (1) and the treated NF into a 100 mL polytetrafluoroethylene-lined stainless autoclave, and seal the autoclave, place it in an oven at 120 °C Reaction for 6 h;

[0040] (3) Washing and drying: After the reaction in step (2) is completed, place the polytetrafluoroethylene autoclave in the air to cool to room temperature, take out the NF evenly covered by the product, wash it with deionized water and ethanol several times, and place it in the Dry in an oven at 70 °C for 3 hours to prepare the MnNi-LDH / NF precursor;

[0041] (4) Material preparation: C 8 h 4...

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Abstract

The invention discloses a preparation method of a highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material (Mn0. 1-Ni-MOF / NF). Nickel nitrate hexahydrate is used as a nickel source, manganese chloride tetrahydrate is used as a manganese source, ammonium fluoride is used as a fluorine source and regulates the pH value of a precursor solution together with urea, foamed nickel is used as a conductive substrate, a MnNi-LDH / NF precursor is prepared by adopting a hydrothermal method, MnNi-LDH / NF is treated by adopting a solvothermal method to prepare Mn0.1-Ni-MOF / NF wihch is used for the supercapacitor self-support electrode material, and in a 6M KOH electrolyte, the current density is 2mA cm<2>, and extremely high area specific capacitance (16.2 F cm<2>) is shown, and the performance is far higher than that of an undoped NiMOF nanosheet array material. The novel energy storage material with high area specific capacitance, long cycle life and lowcost is constructed by fully utilizing the high specific surface area of the nano array structure and the synergistic effect among various metals.

Description

technical field [0001] The present invention relates to the material preparation of metal doping and three-dimensional highly regular array nano-array structure and its application to supercapacitor electrode materials, especially MnNi-LDH with in-situ growth of ultra-thin nano-sheet array structure on nickel foam (NF) / NF precursor, followed by solvothermal treatment to prepare Mn 0.1 -Ni-MOF / NF, and the application of this material in the field of electrochemical energy storage. High-performance supercapacitor electrode materials can be prepared using only a simple, controllable, and economical synthesis method. Background technique [0002] The impending depletion of fossil fuels and growing environmental concerns have driven the exploration of green and renewable energy sources with high energy output ( Chem. Soc. Rev. , 2015, 44, 5148–5180). However, typical clean energy sources, such as solar energy, wind energy, and tidal energy, are actually intermittent and requi...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30B01J31/22C08G83/00
CPCB01J31/2239B01J2531/847C08G83/008H01G11/24H01G11/30Y02E60/13
Inventor 姚亚东郑登超文豪
Owner SICHUAN UNIV
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