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High-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material and preparation method and application thereof

A technology of nitrogen-doped graphene and bacterial cellulose, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem that the specific surface area is not fully utilized, the specific capacitance is not fully utilized, and the crystals are not directly connected. Connection and other issues to achieve the effect of enhancing the electron transfer rate, improving the defects of structural damage, and low cost

Active Publication Date: 2019-09-27
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene has stacking between sheets in practical applications, so that its specific surface area cannot be fully utilized. Moreover, the crystal defects of graphene prepared by chemical methods are inevitable, and the crystals are not directly connected, resulting in the failure of the inherent specific capacitance. full play

Method used

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  • High-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material and preparation method and application thereof
  • High-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material and preparation method and application thereof
  • High-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material and preparation method and application thereof

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preparation example Construction

[0035] The steps of the preparation method of bacterial cellulose-based flexible nitrogen-doped graphene polypyrrole supercapacitor electrode material of the present invention are as follows:

[0036] (1) Add nitrogen source to 50-100mL of 2mg·mL -1 In the graphene oxide (GO) dispersion, the time of mixing and ultrasonic dispersion is 1~2h; then the hydrothermal reaction is carried out in the range of 80℃~160℃ for 3~24h, after the reaction is completed, it is centrifuged, washed and dried to obtain nitrogen-doped reduced graphite oxide Alkenes, add water and mix well to make 1mg mL -1 Nitrogen-doped reduced graphene oxide dispersions.

[0037] The nitrogen source is aminoguanidine, urea or hydrazine hydrate-ammonia water; wherein:

[0038] When aminoguanidine is used, the mass ratio of aminoguanidine to graphene oxide is 0.6g:(0.1-0.2)g; and NaOH is used to adjust the pH to 11-13, and then the hydrothermal reaction is performed.

[0039] When urea is used, the mass ratio of...

Embodiment 1

[0051] (1) Mix 50mL of GO (2mg·mL -1 ) ultrasonic treatment, place in a 250mL three-necked flask, add 0.6g of aminoguanidine under high-speed stirring, adjust the pH to 12 (black viscous shape) with NaOH, stir and react at 80°C for 12h, centrifuge and wash with ethanol and deionized water after the reaction To neutral, dry to obtain aminoguanidine nitrogen-doped reduced graphene oxide, add water and mix evenly to make 1mgmL -1 Nitrogen-doped reduced graphene oxide dispersions.

[0052] (2) Py monomer (0.25mL) and p-toluenesulfonic acid (665mg) were slowly added to the prepared 50mL BC suspension (2.8mg·mL -1 ), ultrasonically dispersed for 1 h to form a Py / BC suspension.

[0053] (3) Transfer the Py / BC suspension to ice water and stir vigorously. Then, an aqueous solution of ferric chloride containing 973 mg of ferric chloride was added dropwise to the Py / BC suspension, and stirred continuously for 6 h to obtain a PPy / BC suspension at 0-5°C.

[0054] (4) After polymerizati...

Embodiment 2

[0062] (1) Mix 70mL of GO (2mg·mL -1 ), adjust the pH to 10 with ammonia water, add 2 mL of hydrazine hydrate, and stir for 10 minutes. Transfer to a reaction kettle, react at 80°C for 3 hours, and after the reaction is completed, wash with ethanol and deionized water to neutrality. Get hydrazine-ammonia nitrogen-doped reduced graphene oxide, add water and mix well to make 1mg mL -1 Nitrogen-doped reduced graphene oxide dispersions.

[0063] (2) Py monomer (0.25mL) and p-toluenesulfonic acid (665mg) were slowly added to the prepared 50mL BC suspension (2.8mg·mL -1 ), ultrasonically dispersed for 1 h to form a Py / BC suspension.

[0064] (3) Transfer the homogeneous Py / BC suspension to ice water and stir vigorously. Then, an aqueous solution of ferric chloride containing 973 mg of ferric chloride was added dropwise to the Py / BC suspension, and stirred continuously for 6 h to obtain a PPy / BC suspension at 0-5°C.

[0065] (4) After polymerization, 32 mL of 1 mg·mL -1 The nit...

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Abstract

The invention relates to a high-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material and a preparation method and application thereof. The preparation method comprises the following steps: adding a nitrogen source into graphene oxide dispersion liquid, and carrying out hydrothermal reaction to prepare nitrogen-doped reduced graphene oxide; adding a Py monomer and p-toluenesulfonic acid into the BC suspension, and performing uniform dispersing; adding a ferric chloride aqueous solution into the Py / BC suspension in an ice-water bath, and carrying out in-situ polymerization to form a PPy / BC suspension; adding the nitrogen-doped reduced graphene oxide dispersion liquid into the PPy / BC suspension liquid, and performing continuous reacting to obtain PPy / BC / N-rGO suspension liquid, and carrying out suction filtration and drying to obtain the high-specific-capacitance bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material. The material provided by the invention has high specific capacity of 605F / g at most under the current density of 1A / g, shows good electrochemical performances, and also has the characteristics of high strength and flexibility.

Description

technical field [0001] The invention relates to the technical field of new energy storage devices, in particular to a bacterial cellulose-based flexible nitrogen-doped graphene supercapacitor electrode material with high specific capacitance and its preparation method and application. Background technique [0002] With the rapid development of flexible electronic devices, energy storage devices for powering them have been extensively studied. Among common energy storage devices, supercapacitors are more in line with people's needs for modern technology products and high-quality green life, and in line with future development trends due to their fast charging and discharging that traditional batteries do not have, excellent flexibility, and environmental friendliness. , however, its low energy density restricts its application. Therefore, it is of great significance to develop a supercapacitor with high energy density. [0003] Electrode materials are the key components of ...

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 张素风周浩唐蕊华刘丽娜周秋生
Owner SHAANXI UNIV OF SCI & TECH
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