A kind of graphene composite hydrogel and its preparation and application

A graphene composite and composite hydrogel technology, which is applied in the preparation/purification of carbon, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve the problem of weakened energy storage capacity and insufficient flexibility of all-solid supercapacitors, etc. problem, to achieve the effect of improved capacitance performance, good cycle stability, and fast electron transmission

Active Publication Date: 2021-08-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a graphene composite hydrogel and its preparation and application to overcome the defects of insufficient flexibility of all solid-state supercapacitors and weakened energy storage capacity in low temperature or extreme environments in the prior art

Method used

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  • A kind of graphene composite hydrogel and its preparation and application
  • A kind of graphene composite hydrogel and its preparation and application
  • A kind of graphene composite hydrogel and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Dissolve 1.8g of phenol into 45mL of sodium hydroxide aqueous solution (1M), and mix with 6.3mL of formaldehyde solution (37wt%), add 45mL of F127 solution with a concentration of 64mg / mL, heat to 66°C and stir for 2 hours , followed by adding 150 mL of water to continue the reaction for 18 hours. After the reaction is complete, dilute the solution 3 times and put it into a hydrothermal kettle at a high temperature of 130°C for 24 hours to obtain phenolic resin prepolymer nanospheres. After washing and drying, they are calcined with melamine at 900°C for 2 hours to obtain nitrogen-doped mesoporous carbon nanospheres.

[0037] (2) Add 1 mg of the above-mentioned mesoporous carbon nanospheres to 1 mL of graphene oxide solution containing 2 mg / mL, and conduct ultrasonic treatment with a probe for 1 h to obtain a uniform dispersion.

[0038] (3) Sodium ascorbate solution (50 μL, concentration 1M) was added to the dispersion in step (2), and hydrothermally reacted at 100...

Embodiment 2

[0041] According to Example 1, the mass of the mesoporous carbon nanospheres in step (2) was modified to 2 mg, and the rest were the same as in Example 1 to obtain a graphene composite (N-MCN@GH) hydrogel.

[0042] Pure graphene (GH) hydrogel is the same as Example 1 except that no mesoporous carbon nanospheres are added.

[0043] figure 2 a-c shows the peak of nitrogen element, which proves that nitrogen-doped mesoporous carbon nanospheres are embedded in the graphene network, figure 2 d shows that the specific surface area of ​​N-MCN@GH is 742m 2 / g, GH specific surface area is 125m 2 / g, which proves that the addition of mesoporous carbon nanospheres can effectively increase the specific surface area of ​​the composite, which is conducive to the immersion of the electrolyte.

Embodiment 3

[0045] The graphene composite hydrogel in embodiment 2 is directly pressed on the current collector stainless steel mesh (500 mesh) under 10MPa pressure, and utilizes polymer electrolyte PVA / H 2 SO 4 (The PVA concentration is 10wt%, the sulfuric acid concentration is 1M), the electrolyte is coated on the electrode, and after drying, the two electrodes are stacked to form a flexible all-solid supercapacitor.

[0046] The pure graphene (GH) hydrogel in Example 2 was assembled into a GH supercapacitor according to the above method.

[0047] Place the above capacitor under the solar simulator (0.36W / cm 2 ), and a low-temperature environment was simulated by a constant temperature water bath under the capacitor, and its electrochemical performance was tested under light conditions, such as Image 6 As shown, it shows that the N-MCN@GH electrode has a stronger absorption capacity for light, which is because the embedding of mesoporous carbon nanospheres can improve the absorption ...

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Abstract

The invention relates to a graphene composite hydrogel and its preparation and application. The composite hydrogel includes graphene and mesoporous carbon nanospheres. The preparation method comprises: dispersing graphene oxide and mesoporous carbon nanospheres in water, using a probe to sonicate until the dispersion is even, to obtain a dispersion liquid, and adding a weak reducing agent for hydrothermal reaction. The all-solid-state supercapacitor assembled by the composite hydrogel has high specific capacitance and volume energy density, good flexibility, and can significantly improve its capacitive performance under sunlight irradiation.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrodes and their preparation and application, in particular to a graphene composite hydrogel and its preparation and application. Background technique [0002] The rapid development of technologies such as wearable devices, e-textiles, mobile devices, and implanted electronics has brought the electronics field into an era of diversified smart devices. Such portable devices require independent energy storage and power supply systems, and require good mechanical stability. Therefore, it is of great significance to develop multifunctional self-powered flexible wearable smart devices. Currently, flexible self-powered devices include: flexible lithium-ion batteries, fuel cells, and supercapacitors. Among them, supercapacitors are becoming an important class of energy storage systems due to their fast charging and discharging, high power density, and long cycle life. Flexible flexible supercapacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/24H01G11/26H01G11/44H01G11/86C01B32/05
CPCC01B32/05H01G11/24H01G11/26H01G11/30H01G11/36H01G11/44H01G11/86Y02E60/13
Inventor 王义赵明宇
Owner DONGHUA UNIV
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