Water system asymmetric supercapacitor based on porous carbon nitride/graphene/nickel disulfide and carbon nitride/graphene and preparation method thereof

A supercapacitor and nickel disulfide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor capacitance and cycle stability, high specific capacitance, low electron mobility volume change electrode structure, etc. , to achieve the effect of no capacity attenuation, high energy density, and stable cycle

Active Publication Date: 2020-02-18
XI AN JIAOTONG UNIV
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Problems solved by technology

Pseudocapacitive cathode materials based on metal compounds exhibit excellent reversible redox reaction characteristics in aqueous electrolyte (alkaline), and have the advantages of high specific capacitance, low cost, easy

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  • Water system asymmetric supercapacitor based on porous carbon nitride/graphene/nickel disulfide and carbon nitride/graphene and preparation method thereof
  • Water system asymmetric supercapacitor based on porous carbon nitride/graphene/nickel disulfide and carbon nitride/graphene and preparation method thereof
  • Water system asymmetric supercapacitor based on porous carbon nitride/graphene/nickel disulfide and carbon nitride/graphene and preparation method thereof

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[0046] Preparation method of aqueous asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide as positive electrode material and carbon nitride / graphene as negative electrode material, using porous layered porous carbon nitride / graphene / disulfide Nickel is the positive electrode material, and the carbon nitride / graphene of the porous structure is the negative electrode material. The specific preparation steps are as follows:

[0047] (1) Preparation of cathode material carbon nitride / graphene / nickel disulfide

[0048] The cellulose powder is dispersed in the N,N-dimethylacetamide solvent, and under the conditions of heating and stirring, it reacts with small organic molecules to obtain a modified cellulose dispersion solution; , N-dimethylformamide dispersion, stir evenly, and then disperse into water through centrifugation, separation, washing, and obtain a modified cellulose-modified graphene aqueous solution. The graphene aqueous solution was adde...

Example Embodiment

[0058] Example 1

[0059] Preparation and characterization of carbon nitride / graphene / nickel disulfide material: Disperse 0.5 mmol of cellulose powder in N,N-dimethylacetamide solvent, add 5 mmol of succinic anhydride, and stir at 80 °C for a period of time. , and then dropwise added 40 mL of 2 mg / mL graphene N,N-dimethylformamide dispersion, stirred at room temperature for a period of time, filtered, washed, and then dispersed into water to obtain a modified cellulose-modified graphene aqueous solution. Dissolve 1 g of melamine in an acidic aqueous solution of pH 1, stir for 30 minutes, add 20 mg of modified cellulose-modified graphene dispersed in water, stir evenly, dry, and then calcine at 550 °C for 4 h to obtain g-C 3 N 4 / Graphene composites. Take 30mg of g-C 3 N 4 / Graphene was first sonicated for 2h under the power of 250W in N,N-dimethylformamide solution, then filtered, washed, and then dispersed in 15mL of aqueous solution, followed by 15mL of 0.6mmol nickel ni...

Example Embodiment

[0068] Example 2

[0069] Preparation of carbon nitride / graphene / nickel disulfide material: Disperse 0.5mmol of cellulose powder in N,N-dimethylacetamide solvent, add 4mmol of citric acid, stir and react at 80°C for a period of time, then dropwise Add 80 mL of 0.5 mg / mL graphene dispersion in N,N-dimethylformamide, and after stirring at room temperature for a period of time, filter, wash and redisperse in water to obtain an aqueous solution of modified cellulose modified graphene. Dissolve 0.2 g of melamine in an acidic solution with a pH of 2, stir for 30 minutes, add 20 mg of modified cellulose-modified graphene dispersed in water, stir evenly, dry, and then calcine at a high temperature of 500 ° C for 6 hours to obtain g-C 3 N 4 / Graphene composites. 15mg g-C 3 N 4 / Graphene was first sonicated for 4h under the power of 250W in N,N-dimethylformamide solution, then filtered, washed, and then dispersed in 30mL of water, followed by ethylene glycol solution with 0.6mmol n...

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Abstract

The invention discloses a water system asymmetric supercapacitor based on porous carbon nitride/graphene/nickel disulfide and carbon nitride/graphene and a preparation method thereof. The positive electrode material is obtained in a way that a one-step calcination method is utilized to obtain a g-C3N4/graphene as the substrate and NiS2 is further loaded to obtain porous layered structure carbon nitride/graphene/nickel disulfide, and the negative electrode material is three-dimensional porous structure carbon nitride/graphene prepared by a solvothermal method. The working voltage of the assembled water system asymmetric supercapacitor is 1.6 V. When the energy density is 56Wh kg-1, the power density reaches 800W kg-1, and there is almost no attenuation of the capacity after 10000 cycles. The high specific energy is realized and the supercapacitor has the characteristics of high specific power, low preparation cost, environmental protection and high practical application value.

Description

technical field [0001] The invention belongs to the technical field of asymmetric supercapacitor electrode materials, and specifically relates to a water-based asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide and carbon nitride / graphene and a preparation method thereof. Background technique [0002] Supercapacitor is an important electrochemical energy storage device. Due to its advantages such as fast charge and discharge speed, long cycle life, high energy density and power density, it has broad applications in many fields such as green energy, transportation, electronic information, etc. application prospects. According to the different types of supercapacitor electrolyte, it can be divided into aqueous and organic supercapacitors. Aqueous supercapacitors are safer than organic systems, and have low preparation costs and are environmentally friendly. In addition, according to the structure of supercapacitors, they can also be divided in...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/86Y02E60/13
Inventor 魏巍巫云萍
Owner XI AN JIAOTONG UNIV
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