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Porous graphene/nickelous hydroxide/polyaniline composite electrode material and preparation method thereof

A technology of porous graphene and nickel hydroxide, applied in the fields of nanocomposite materials and electrochemistry, can solve the problems of large capacity attenuation, low specific capacitance and power density of supercapacitors, etc., and achieve reduced grain size and excellent electrochemical performance. , the effect of long service life

Active Publication Date: 2013-06-12
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific capacitance and power density of the supercapacitor prepared by the above method are still far lower than their theoretical values, and there is a large capacity decay when the current is charged and discharged.

Method used

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  • Porous graphene/nickelous hydroxide/polyaniline composite electrode material and preparation method thereof
  • Porous graphene/nickelous hydroxide/polyaniline composite electrode material and preparation method thereof
  • Porous graphene/nickelous hydroxide/polyaniline composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of graphene oxide: Weigh 1g of graphite powder (Tianjin Kemiou Chemical Reagent Co., Ltd.) and add it to 25mL of 98wt% concentrated sulfuric acid, cool to 0°C in an ice-salt bath, add 2.5g of potassium permanganate, and heat to 30 ℃, 60rpm stirring reaction for 2h, add 200mL water, then add 3mL30wt% hydrogen peroxide to react until the solution is bright yellow, centrifuge and wash at 600rpm, put the obtained solid into water, disperse for 1h under ultrasonic power of 300W, frequency of 40Hz, and then , treated at a microwave power of 700W and a frequency of 2KHz for 1h, filtered and dried to obtain graphene oxide.

[0047] (2) Weigh 1g of graphene oxide prepared in step (1), add 3g of sodium hydroxide, and heat in a tube furnace at 760°C under nitrogen protection for 1h to obtain porous graphene; the specific surface area of ​​porous graphene is 350m 2 / g; its conductivity is 60S·m -1 ; The weight loss within 900°C is 4wt%.

[0048] (3) Add 0.5 g of t...

Embodiment 2

[0052] (1) Weigh 1g of graphene oxide prepared in Example 1, add 4g of potassium hydroxide, and heat in a tube furnace at 800°C under nitrogen protection for 1h to obtain porous graphene; the specific surface area of ​​porous graphene is 370m 2 / g; its conductivity is 50S·m -1 ; The weight loss within 900°C is 4.5wt%.

[0053] (2) Add 0.5 g of the porous graphene prepared above and 2.5 g of nickel chloride into 500 mL of water, sonicate for 50 min at a power of 300 W, then add 3 g of potassium hydroxide, and stir at 85 ° C for 7 h. After the reaction, centrifuge to obtain a solid product, wash the solid with deionized water until neutral, and dry to obtain porous graphene / nickel hydroxide, wherein the particle size of nickel hydroxide is 50nm. The porous graphene / nickel hydroxide is a black powder solid, has no special smell, is non-volatile, insoluble in water, and exists thermally stably at 240°C.

[0054] (3) Add 45 mL of 0.30 mol / L aniline solution (1 mol / L hydrochloric ...

Embodiment 3

[0057] (1) Weigh 1g of graphene oxide prepared in Example 1, add 5g of calcium hydroxide, and heat in a tube furnace at 850°C under nitrogen protection for 1.5h to obtain porous graphene; the specific surface area of ​​porous graphene is 390m 2 / g; its conductivity is 40S·m- 1 ; The weight loss within 900°C is 5wt%.

[0058] (2) Add 0.5 g of the porous graphene prepared above and 2.5 g of nickel sulfate into 500 mL of water, sonicate for 60 min at a power of 400 W, then add 3 g of calcium hydroxide, and stir at 80 ° C for 8 h. After the reaction, centrifuge to obtain a solid product, wash the solid with deionized water until neutral, and dry to obtain porous graphene / nickel hydroxide, wherein the particle size of nickel hydroxide is 70nm. The porous graphene / nickel hydroxide is a black powder solid, has no special smell, is non-volatile, insoluble in water, and exists thermally stably at 240°C.

[0059] (3) Add 50mL of 0.25mol / L aniline solution (1mol / L hydrochloric acid as ...

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Abstract

The invention discloses a porous graphene / nickelous hydroxide / polyaniline composite electrode material and a preparation method thereof, belonging to the technical field of nano composite materials and electrochemistry. The composite electrode material is composited by porous graphene, nickelous hydroxide and polyaniline, and has a porous structure; the nickelous hydroxide is deposited on the porous graphene by the binding effect of holes; the polyaniline is combined with the surface of the graphene by pi-pi mutual effect and is deposited on the surface of the porous graphene. The particle diameter of the nickelous hydroxide is 20-150nm; the specific surface area of the porous graphene is 350-450m<2> / g, the conductivity is 20-60S.m-1, and the weight loss in the temperature of 900 DEG C is 4-6wt%. The obtained porous graphene / nickelous hydroxide / polyaniline composite electrode material has the advantages that the oxidation and reduction performances are good, the specific capacitance is up to 2480F / g, and after the charging and discharging circulate for 2000 times, the specific capacitance is maintained to be about 90% still.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and electrochemistry, and in particular relates to a porous graphene / nickel hydroxide / polyaniline composite electrode material and its preparation method and application. Background technique [0002] Facing the severe challenges of the gradual decrease of world energy and the gradual increase of human energy demand, the development and preparation of new energy storage devices has become one of the effective ways to solve this problem. Among them, the supercapacitor has become a future star in the energy field due to its unique and excellent properties such as high power density, long cycle life and low preparation cost. It can also be widely used in the fields of environment, transportation and electronic information. Its beautiful The application prospect makes the research in this field attract more and more attention (Candelaria, Stephanie L, Shao Y Y, et al. Nanostructured ca...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/38H01G11/48H01G11/86
Inventor 谭绍早张劲林蔡祥麦文杰黄浪欢谢瑜珊
Owner JINAN UNIVERSITY
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