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Three-dimensional AgNWs/RGO hydrogel electrode material and preparation method and application thereof

An electrode material and hydrogel technology, which is applied in the field of three-dimensional AgNWs/RGO hydrogel electrode material and its preparation, can solve the problems that the electrochemical performance of capacitors needs to be improved, the specific surface area of ​​electrode materials is reduced, and the electroactive sites are reduced. Achieve good application prospects, accelerate charge transfer kinetics, and excellent electrochemical performance

Inactive Publication Date: 2020-02-28
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Reduced graphene oxide (RGO) can be prepared from graphene oxide (GO) by chemical reduction, but the strong van der Waals force between graphene sheets will cause agglomeration, resulting in a large decrease in the specific surface area of ​​the electrode material, and the electroactive sites decrease, charge transfer is hindered
Therefore, stacked graphene sheets largely limit its direct application, and the electrochemical performance of graphene-based capacitors still needs to be improved.

Method used

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  • Three-dimensional AgNWs/RGO hydrogel electrode material and preparation method and application thereof
  • Three-dimensional AgNWs/RGO hydrogel electrode material and preparation method and application thereof
  • Three-dimensional AgNWs/RGO hydrogel electrode material and preparation method and application thereof

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Embodiment 1

[0033] This embodiment provides a method for preparing a three-dimensional AgNWs / RGO hydrogel electrode material for supercapacitors, the specific steps are as follows:

[0034] (1) Add 0.58g of surfactant polyvinylpyrrolidone to 20mL of ethylene glycol, and then add 0.3mL of CuCl with a concentration of 0.01mol / L 2 2H 2 O ethylene glycol solution and 1.6 mL of NaBr ethylene glycol solution with a concentration of 0.005 mol / L were used as control agents, and 0.59 g of silver nitrate was added to react at 175 °C for 13 min. After the reaction was completed, AgNWs were obtained by centrifuging and washing several times.

[0035] (2) Prepare a 1 mg / mL graphene oxide aqueous solution, and ultrasonically disperse it for 2 h; add 1.6 mL of AgNWs absolute ethanol solution with a concentration of 5 mg / mL to 25 mL of the above graphene oxide aqueous solution, and mix well to obtain solution A.

[0036] (3) Add 0.15 g of ascorbic acid to the solution A as a reducing agent, and place it...

Embodiment 2

[0044] This embodiment provides a method for preparing a three-dimensional AgNWs / RGO hydrogel electrode material for supercapacitors, the specific steps are as follows:

[0045] (1) Add 0.58g of surfactant polyvinylpyrrolidone to 20mL of ethylene glycol, and then add 0.3mL of CuCl with a concentration of 0.01mol / L 2 2H 2 O ethylene glycol solution and 1.6 mL of NaBr ethylene glycol solution with a concentration of 0.005 mol / L were used as control agents, and 0.59 g of silver nitrate was added to react at 175 °C for 13 min. After the reaction was completed, AgNWs were obtained by centrifuging and washing several times.

[0046] (2) Prepare a 1 mg / mL graphene oxide aqueous solution, and ultrasonically disperse it for 2 hours; add 0.8 mL of AgNWs absolute ethanol solution with a concentration of 5 mg / mL to 25 mL of the above graphene oxide aqueous solution, and mix well to obtain solution A.

[0047] (3) Add 0.15 g of ascorbic acid to the solution A as a reducing agent, and plac...

Embodiment 3

[0050] This embodiment provides a method for preparing a three-dimensional AgNWs / RGO hydrogel electrode material for supercapacitors, the specific steps are as follows:

[0051] (1) Add 0.58g of surfactant polyvinylpyrrolidone to 20mL of ethylene glycol, and then add 0.3mL of CuCl with a concentration of 0.01mol / L 2 2H 2 O ethylene glycol solution and 1.6 mL of NaBr ethylene glycol solution with a concentration of 0.005 mol / L were used as control agents, and 0.59 g of silver nitrate was added to react at 175 °C for 13 min. After the reaction was completed, AgNWs were obtained by centrifuging and washing several times.

[0052] (2) Prepare a 1 mg / mL graphene oxide aqueous solution and ultrasonically disperse it for 2 h; add 0.4 mL of AgNWs absolute ethanol solution with a concentration of 5 mg / mL to 25 mL of the above graphene oxide aqueous solution, and mix well to obtain solution A.

[0053] (3) Add 0.15 g of ascorbic acid as a reducing agent to the solution A, and place it ...

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Abstract

The invention discloses a three-dimensional AgNWs / RGO hydrogel electrode material and a preparation method and application thereof. The method comprises the steps: (1) uniformly mixing an AgNWs solution and a graphene oxide solution to obtain a mixed solution, wherein the mass ratio of AgNWs to graphene oxide is (0.1-10): (5-250); and (2) adding ascorbic acid into the mixed solution, carrying outreduction reaction at 50-100 DEG C for 8-15 hours, and carrying out dialyzing to obtain the three-dimensional AgNWs / RGO hydrogel electrode material. According to the prepared three-dimensional AgNWs / RGO hydrogel electrode material, stacking between RGO sheets is reduced; AgNWs can provide a shorter transmission path and more electroactive sites, so that charge transfer kinetics is accelerated, transmission of electrons and diffusion of ions are promoted, and excellent charge transmission characteristics are shown; and the preparation process is simple to operate and has a good application prospect in the field of energy.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a three-dimensional AgNWs / RGO hydrogel electrode material and its preparation method and application. Background technique [0002] As non-renewable energy sources such as coal and natural gas continue to be consumed, there is a growing need for more efficient energy storage devices. Supercapacitors are energy storage systems with high power density, fast charging and discharging, long life, and environmental friendliness, which can be used in many fields such as public transportation, wearable and portable consumer electronics, and so on. Therefore, continuous research is required to achieve high performance of materials and devices to meet the ever-increasing demands of consumer electronics. Graphene has attracted more and more attention in the field of energy storage because of its high specific surface area and good electrical properties. [0003] The graphene hy...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/32H01G11/86
CPCH01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 张鹏崔洁林志丹曹琳黄琴林怀俊李卫
Owner JINAN UNIVERSITY
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