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Co-Ni bimetallic selenide/graphene composite electrode material

An electrode material and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of poor cycle stability, low specific capacitance, and low specific capacity, and improve the performance of supercapacitors. The effect of high specific capacitance and improved conductivity

Inactive Publication Date: 2019-01-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The performance of supercapacitors is closely related to the electrode materials used. The three commonly used electrode materials (carbon materials, metal oxides / hydroxides, and conductive polymers) have their own advantages and disadvantages: the production process of carbon materials is simple, low in price, and recyclable. Good performance, but low specific capacity; metal oxides / hydroxides and conductive polymers have high specific capacity, but high cost and poor cycle stability
Carbon materials (activated carbon, graphene, carbon fiber, etc.) have excellent electrical conductivity and cycle stability, but low specific capacitance

Method used

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  • Co-Ni bimetallic selenide/graphene composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of preparation method of cobalt-nickel double metal selenide / graphene composite electrode material, concrete steps are:

[0026] (1) Weigh 10 mg of graphene oxide (GO, self-made) and add it to 50 mL of ethylene glycol, and disperse ultrasonically for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0027] (2) Weigh 0.3 g of polyvinylpyrrolidone (PVP), 125 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 124 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixed solution to a round bottom flask and place it on an oil bath at 150°C for 5 hours in an oil bath. Finally, after it was naturally cooled to room temperature, it was centrifuged and washed 4 times with absolute ethanol, and the washed product was dried in an electric blast drying oven;

[0028] (3) Weigh 15 mg of the centrifuged-dried product in step (2), 100 mg of sod...

Embodiment 2

[0030] A kind of preparation method of cobalt-nickel double metal selenide / graphene composite electrode material, concrete steps are:

[0031] (1) Weigh 5 mg of graphene oxide (GO, self-made) and add it to 30 mL of ethylene glycol, and ultrasonically disperse for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0032] (2) Weigh 0.5 g of polyvinylpyrrolidone (PVP), 250 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 250 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixture to a round bottom flask and place it on an oil bath at 250°C for 1 hour in an oil bath. Finally, after it was naturally cooled to room temperature, it was centrifuged and washed 5 times with absolute ethanol, and the washed product was placed in an electric blast drying oven to dry;

[0033] (3) Weigh 30 mg of the centrifuged-dried product in step (2), 250 mg of sodi...

Embodiment 3

[0035] A kind of preparation method of cobalt-nickel double metal selenide / graphene composite electrode material, concrete steps are:

[0036] (1) Weigh 20 mg of graphene oxide (GO, self-made) and add it to 100 mL of ethylene glycol, and ultrasonically disperse for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0037] (2) Weigh 0.1 g of polyvinylpyrrolidone (PVP), 60 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 70 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixture to a round bottom flask and place it on an oil bath at 200°C for 1 hour in an oil bath. Finally, after it was naturally cooled to room temperature, it was centrifuged and washed 5 times with absolute ethanol, and the washed product was placed in an electric blast drying oven to dry;

[0038] (3) Weigh 50 mg of the centrifuged-dried product in step (2), 300 mg of sodium...

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Abstract

The invention discloses a cobalt-nickel bimetallic selenide / graphene composite electrode material, and belongs to the preparation field of electrode material for supercapacitors. A manufacture methodcomprises that follow steps: adding graphene oxide (GO) into ethylene glycol solution, ultrasonic dispersing, and uniformly dispersing GO in the ethylene glycol solution; Adding polyvinylpyrrolidone(PVP), cobalt acetate tetrahydrate and nickel acetate tetrahydrate into the GO dispersion, ultrasonic dispersing and dissolving, transferring it to a round bottom flask for oil bath reaction and centrifugal washing and drying; After centrifugal washing and drying after oil bath, the product was hydrothermally selenized with sodium selenite and hydrazine hydrate to obtain Co-Ni bimetallic selenide / graphene composite electrode material. A large number of uniform size Co-Ni-Se nanosheets were uniformly loaded on graphene substrate, and the prepared electrode materials had high specific capacitance and excellent rate performance.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for supercapacitors, and in particular relates to a cobalt-nickel double metal selenide / graphene composite electrode material and a preparation method thereof. Background technique [0002] Supercapacitors can be used in energy storage devices, power Power systems and many electronic devices have attracted extensive attention from industry and academia. The performance of supercapacitors is closely related to the electrode materials used. The three commonly used electrode materials (carbon materials, metal oxides / hydroxides, and conductive polymers) have their own advantages and disadvantages: the production process of carbon materials is simple, low in price, and recyclable. Good performance, but low specific capacity; metal oxides / hydroxides and conductive polymers have high specific capacity, but high cost and poor cycle stability. Studies have shown that the combination of t...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 陈奇俤祝雪双蔡道平詹红兵
Owner FUZHOU UNIV
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