CN113539697A - Reduced graphene oxide/conductive polymer composite gel and preparation method thereof - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 132
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- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 13
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
Abstract
The invention provides reduced graphene oxide/conductive polymer composite gel and a preparation method thereof, wherein the preparation method comprises the following steps: s1, adjusting the pH value of the dopamine hydrochloride solution to 8-9, and marking as a solution A; s2, adding a conductive polymer into the graphene oxide aqueous dispersion, stirring and performing ultrasonic treatment to uniformly disperse the conductive polymer, and marking as a solution B; s3, adding the solution A into the solution B, uniformly stirring, carrying out hydrothermal reaction, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel. The dopamine is coated on the surfaces of the graphene oxide and the conductive polymer and is polymerized into polydopamine, so that the mutual dispersion of the graphene oxide and the conductive polymer is promoted, and the electrical property of the composite gel is improved; in addition, the electrochemical properties of the composite gel can be regulated and controlled by controlling the proportion of each component.
Description
Technical Field
The invention relates to the technical field of conductive polymers, in particular to reduced graphene oxide/conductive polymer composite gel and a preparation method thereof.
Background
In recent years, due to the rapid development of intelligent portable electronic products, electric vehicles, and clean environmental awareness, the demand for high-energy, sustainable, and environmentally friendly electrochemical energy storage devices has increased greatly. Due to the advances in machine learning, artificial intelligence, the internet of things, and functionality of these smart devices, their power consumption has increased many times. In order to meet the requirement of the emerging intelligent electronic field on energy storage, the design and development of efficient high-energy flexible electrode materials become necessary. The conductive polymer hydrogel becomes an intelligent soft substance with wide application. The three-dimensional structure of the hydrogel increases the specific surface area of the hydrogel, so that the hydrogel is beneficial to fully contacting with electrolyte, the specific capacitance is improved, and the hydrogel becomes a prospect material of a capacitor.
Graphene is a single atomic layer that can be extended to tens of microns in lateral dimension at any time, with its structure spanning the typical dimensions of general chemistry and material science. Graphene can be considered a non-traditional soft material with properties of polymers, colloids, films, and amphiphilic molecules. Among a plurality of conductive high polymer materials, the nitrogen-containing functional polymers such as polyaniline and polypyrrole have the advantages of high flexibility, various nitrogen oxides, adjustable electrical property, good stability, easiness in electrochemical polymerization film formation and the like. Graphene is combined with polyaniline or polypyrrole, and the graphene is used as a framework, so that the composite gel can be assembled.
However, since graphene is very prone to agglomeration, in the compounding process, conductive polymers are usually difficult to be uniformly loaded on the surface of graphene, and the electrode material can fully exert the characteristics of large specific surface area and the like of graphene only through uniform compounding. Therefore, the method has important research significance for more deeply exploring the compounding process of the graphene and the conductive high polymer material, optimizing the electrochemical performance of the graphene and the conductive high polymer material and the like.
Disclosure of Invention
In view of the above, the present invention provides a reduced graphene oxide/conductive polymer composite gel and a preparation method thereof, which solve the problem of poor electrochemical performance caused by poor dispersibility of graphene and conductive polymer in the existing composite gel.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method of reduced graphene oxide/conductive polymer composite gel comprises the following steps:
s1, adjusting the pH value of the dopamine hydrochloride solution to 8-9, and marking as a solution A;
s2, adding a conductive polymer into the graphene oxide aqueous dispersion, stirring and performing ultrasonic treatment to uniformly disperse the conductive polymer, and marking as a solution B;
s3, adding the solution A into the solution B, uniformly stirring, carrying out hydrothermal reaction, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
In the above technical solution, optionally, in S1, the adjusted pH of the dopamine hydrochloride solution is adjusted by using a trihydroxymethane solution.
In the above technical solution, optionally, the concentration of the trihydroxymethane solution is 2 mg/mL.
In the foregoing technical solution, optionally, in S2, the conductive polymer is polypyrrole or polyaniline.
In the above technical solution, optionally, in S2, the mass ratio of the conductive polymer to the graphene oxide aqueous dispersion is (1-2): (1-4).
In the above technical solution, optionally, in S2, the stirring and ultrasound time is 30-45 min.
In the above technical solution, optionally, in S3, the volume ratio of the solution a to the solution B is 1: (4-8).
In the above technical scheme, optionally, in S3, the hydrothermal reaction temperature is 90-100 ℃, and the reaction time is 10-12 h.
In the above technical solution, optionally, the graphene oxide aqueous dispersion is prepared by the steps of:
adding graphene oxide into a cellulose nanocrystal water dispersion liquid with the concentration of 1-10mg/ml, performing ultrasonic dispersion treatment, and then standing for layering to obtain the graphene oxide water dispersion liquid.
The invention also aims to provide the reduced graphene oxide/conductive polymer composite gel, which is prepared by the preparation method of the reduced graphene oxide/conductive polymer composite gel.
Compared with the prior art, the reduced graphene oxide/conductive polymer composite gel and the preparation method thereof provided by the invention have the following advantages:
(1) the dopamine is coated on the surfaces of the graphene oxide and the conductive polymer and is polymerized into polydopamine, so that the mutual dispersion of the graphene oxide and the conductive polymer is promoted, and the electrical property of the composite gel is improved; in addition, the electrochemical properties of the composite gel can be regulated and controlled by controlling the proportion of each component.
(2) The reduced graphene oxide/conductive polymer composite gel provided by the invention is simple in preparation method, free of organic solvent and free of pollution to the environment; no special instrument is needed, and the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a method for preparing a reduced graphene oxide/conductive polymer composite gel according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, the examples given are intended to illustrate the invention and are not intended to limit the scope of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The terms "comprising," "including," "containing," and "having" are intended to be inclusive, i.e., that additional steps and other ingredients may be added without affecting the result.
Graphene is a two-dimensional plane with sp carbon atoms2The hybrid forms are connected with each other to form a carbon material with a thickness of a monoatomic layer, and carbon atoms of the carbon material are arranged in a hexagonal honeycomb shape. Due to its special structural properties, graphene has many excellent physical and chemical properties, such as high mechanical strength, good electrical and thermal conductivity, and large specific surface area, its electrical resistivity is very low, and the rate of electron migration is very fast, which make graphene suitable as an electrode material in a supercapacitor. Under the hydrothermal condition, the graphene oxide nanosheets can be arranged along the direction of a flow field under the action of fluid shear force to form gel.
In order to further improve the performance of the gel, the inventor creatively compounds the graphene and the conductive polymer to form the composite gel, so as to improve the electrical property of the conductive gel and expand the application field of the graphene. However, graphene is prone to agglomeration in the compounding process, so that the specific surface area ratio is low, and ions are not easy to enter between graphene layers, thereby affecting the electrochemical performance.
In order to further solve the above problem, with reference to fig. 1, an embodiment of the present invention provides a method for preparing reduced graphene oxide/conductive polymer composite gel, including the following steps:
s1, adjusting the pH value of the dopamine hydrochloride solution to 8-9, and marking as a solution A;
s2, adding a conductive polymer into the graphene oxide aqueous dispersion, stirring and performing ultrasonic treatment to uniformly disperse the conductive polymer, and marking as a solution B;
and S3, adding the solution A into the solution B, uniformly stirring, carrying out hydrothermal reaction, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
According to the preparation method, a dopamine hydrochloride solution is added, under an alkaline condition, dopamine is coated on the surfaces of graphene oxide and conductive polymers and is polymerized into poly-dopamine, and mutual dispersion of the graphene oxide and the conductive polymers is promoted; and then reducing and oxidizing the graphene in a hydrothermal reaction by using aniline to obtain reduced graphene oxide/conductive polymer composite gel. And as the graphene has larger specific surface area, high electric conductivity, high thermal conductivity and good mechanical property, the graphene is introduced into the conductive gel, so that the mechanical property of the composite gel can be improved, and the conductive performance of the composite gel can be enhanced.
In the preparation process, the steps are simple, the reaction conditions are mild, complex equipment is not needed, an organic solvent is not needed in the preparation process, the preparation method is environment-friendly, the content of each component in the composite gel is adjustable, and the applicability is wide.
In step S1, the pH of the dopamine hydrochloride solution may be adjusted by various common means, and preferably, in the embodiment of the present invention, a trihydroxymethane solution is used as a buffer solution to adjust the pH of the dopamine hydrochloride solution, wherein the concentration of the trihydroxymethane solution is 2 mg/mL.
In step S2, the conductive polymer is polypyrrole or polyaniline. Polypyrrole or polyaniline has higher specific capacity and higher conductivity, and is an ideal electrode component material.
Wherein the mass ratio of the conductive polymer to the graphene oxide aqueous dispersion is (1-2): (1-4).
Specifically, step S2 is: and taking 10mL of graphene oxide aqueous dispersion with the concentration of 2-4mg/mL, adding 5-40mg of conductive polymer into the graphene oxide aqueous dispersion, stirring for 10-15min, and performing ultrasonic treatment for 20-25min to uniformly disperse the graphene oxide aqueous dispersion, wherein the solution is marked as solution B.
Furthermore, the source of the graphene oxide aqueous dispersion is not limited, and the graphene oxide aqueous dispersion can be selected from commercially available graphene oxides, or graphene oxide can be prepared by oxidation reaction using graphite as a raw material, so as to prepare the graphene oxide aqueous dispersion. Preferably, in an embodiment of the present invention, the preparing step of the graphene oxide aqueous dispersion includes:
adding graphene oxide into a cellulose nanocrystalline water dispersion liquid with the concentration of 1-10mg/ml, performing ultrasonic dispersion treatment, and then standing for layering to obtain the graphene oxide water dispersion liquid.
In step S3, the volume ratio of solution a to solution B is 1: (4-8), the reaction temperature is 90-100 ℃, and the reaction time is 10-12 h.
Specifically, step S3 is: and adding 2-5mL of the solution A into the solution B, stirring for 10-15min for thermal reaction, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
The invention also aims to provide the reduced graphene oxide/conductive polymer composite gel, which is prepared by the preparation method of the reduced graphene oxide/conductive polymer composite gel. The composite gel is coated on the surfaces of the graphene oxide and the conductive polymer by dopamine, and is polymerized into polydopamine, so that the mutual dispersion of the graphene oxide and the conductive polymer is promoted, the system is more stable, and the prepared composite gel can simultaneously show the excellent characteristics of the graphene and the conductive polymer, so that the reduced graphene oxide/conductive polymer composite gel is suitable for the fields of supercapacitors, mobile wearable devices and the like.
On the basis of the above embodiment, the present invention is further illustrated below by combining a preparation method of reduced graphene oxide/conductive polymer composite gel. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are examples of experimental procedures not specified under specific conditions, generally according to the conditions recommended by the manufacturer. Unless otherwise indicated, percentages and parts are by mass.
Example 1
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which specifically comprises the following steps:
1) regulating the pH value of a hydrochloric acid dopamine solution with the concentration of 2mg/mL to 8 by using a trihydroxymethane solution, and marking as a solution A;
2) taking 10mL of graphene oxide aqueous dispersion with the concentration of 2mg/mL, adding 5mg of polyaniline into the graphene oxide aqueous dispersion, stirring for 10min, and carrying out ultrasonic treatment for 20min to uniformly disperse the polyaniline, and marking as a solution B;
3) and adding 2mL of the solution A into the solution B, stirring for 10min, carrying out low-temperature hydrothermal reaction at 95 ℃ for 10h, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
The invention adopts low-temperature hydrothermal reaction to synthesize gel, thereby greatly reducing energy consumption and ensuring relatively safe experimental process.
The reduced graphene oxide/conductive polymer composite gel prepared in example 1 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 1 was measured to be 280F/g at a scanning rate of 5 mV/s.
Example 2
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which is different from the embodiment 1 in that:
in the step 1), regulating the pH value of a dopamine hydrochloride solution with the concentration of 2mg/mL to 8.5 by using a trihydroxymethane solution, and marking as a solution A;
in the step 2), 10mL of graphene oxide aqueous dispersion with the concentration of 2mg/mL is taken, 10mg of polyaniline is added into the graphene oxide aqueous dispersion, stirring is carried out for 15min, ultrasonic treatment is carried out for 10min, and the solution is uniformly dispersed and marked as a solution B;
the remaining steps and parameters were the same as in example 1.
The reduced graphene oxide/conductive polymer composite gel prepared in example 2 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 2 was measured to be 375F/g at a scanning rate of 5 mV/s.
Example 3
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which is different from the embodiment 1 in that:
in the step 2), taking 10mL of graphene oxide aqueous dispersion with the concentration of 3mg/mL, adding 20mg of polyaniline into the graphene oxide aqueous dispersion, stirring for 10min, and performing ultrasonic treatment for 20min to uniformly disperse the polyaniline, wherein the solution is marked as a solution B;
in the step 3), 2mL of the solution A is added into the solution B, the mixture is stirred for 10min, and then the low-temperature hydrothermal reaction is carried out for 12h at the temperature of 95 ℃;
the remaining steps and parameters were the same as in example 1.
The reduced graphene oxide/conductive polymer composite gel prepared in example 3 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 3 was 465F/g when the scanning rate was 5 mV/s.
Example 4
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which comprises the following steps:
1) regulating the pH value of a hydrochloric acid dopamine solution with the concentration of 2mg/mL to 9 by using a trihydroxymethane solution, and marking as a solution A;
2) taking 10mL of graphene oxide aqueous dispersion with the concentration of 2mg/mL, adding 40mg of polyaniline into the graphene oxide aqueous dispersion, stirring for 20min, and carrying out ultrasonic treatment for 10min to uniformly disperse the polyaniline, wherein the solution is marked as solution B;
3) and adding 2mL of the solution A into the solution B, stirring for 10min, then carrying out low-temperature hydrothermal reaction at 95 ℃ for 12h, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
The reduced graphene oxide/conductive polymer composite gel prepared in example 4 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, silver chloride electrode as reference electrode, platinum electrode as counter electrode, and oxygen is reducedThe sheet pressed by the graphene/conductive polymer composite gel is used as a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 4 was 485F/g when the scanning rate was 5 mV/s.
Example 5
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which is different from the embodiment 1 in that:
in the step 2), 10mL of graphene oxide aqueous dispersion with the concentration of 2.5mg/mL is taken, 5mg of polypyrrole is added into the graphene oxide aqueous dispersion, the mixture is stirred for 10min and subjected to ultrasonic treatment for 20min to be uniformly dispersed, and the mixture is marked as a solution B;
the remaining steps and parameters were the same as in example 1.
The reduced graphene oxide/conductive polymer composite gel prepared in example 5 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 3 was 365F/g when the scanning rate was 5 mV/s.
Example 6
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which is different from the embodiment 1 in that:
in the step 1), regulating the pH value of a dopamine hydrochloride solution with the concentration of 2.5mg/mL to 8 by using a trihydroxymethane solution;
in the step 2), 10mL of graphene oxide aqueous dispersion with the concentration of 3mg/mL is taken, and 10mg of polypyrrole is added into the graphene oxide aqueous dispersion;
in the step 3), carrying out low-temperature hydrothermal reaction for 10h at the temperature of 100 ℃;
the remaining steps and parameters were the same as in example 1.
The reduced graphene oxide/conductive polymer composite gel prepared in example 6 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 3 was measured to be 315F/g at a scanning rate of 5 mV/s.
Example 7
The embodiment provides a preparation method of reduced graphene oxide/conductive polymer composite gel, which is different from the embodiment 1 in that:
in the step 1), regulating the pH value of a dopamine hydrochloride solution with the concentration of 3mg/mL to 8 by using a trihydroxymethane solution;
in the step 2), taking 10mL of graphene oxide aqueous dispersion with the concentration of 3mg/mL, adding 20mg of polypyrrole into the graphene oxide aqueous dispersion, stirring for 10min, and performing ultrasonic treatment for 20min to uniformly disperse the polypyrrole, wherein the solution is marked as a solution B;
in the step 3), carrying out low-temperature hydrothermal reaction for 12h at the temperature of 100 ℃;
the remaining steps and parameters were the same as in example 1.
The reduced graphene oxide/conductive polymer composite gel prepared in example 7 was subjected to electrochemical testing under the following conditions: 1m H2SO4The solution is electrolyte, the silver chloride electrode is a reference electrode, the platinum electrode is a counter electrode, and a sheet formed by pressing the reduced graphene oxide/conductive polymer composite gel is a working electrode.
The specific capacitance of the reduced graphene oxide/conductive polymer composite gel prepared in example 7 was measured to be 310F/g at a scanning rate of 5 mV/s.
Through the above embodiment, it can be found that the electrochemical performance of the reduced graphene oxide/conductive polymer composite gel can be regulated and controlled by controlling parameters such as the concentration and the pH value of the dopamine hydrochloride solution, the addition amount of polypyrrole, the hydrothermal reaction condition, and the like, and specific data are shown in table 1:
TABLE 1 specific capacitance of reduced graphene oxide/conductive Polymer composite gels prepared in examples 1 to 7
As can be seen from table 1, in examples 1 to 4, the added conductive polymer was polyaniline, and the specific capacitance was proportional to the content of the conductive polymer. However, from the overall test data, the performance is best when the polyaniline content is 20 mg. In examples 5 to 7, polypyrrole was added as the conductive polymer, and the specific capacitance was inversely proportional to the conductive polymer. The best performance is obtained when the polypyrrole content is 5 mg.
Comparative example 1:
comparative example 1 provides a method for preparing a reduced graphene oxide/conductive polymer composite, comprising the steps of:
1) taking 10mL of graphene oxide aqueous dispersion with the concentration of 2mg/mL, adding a conductive polymer into the graphene oxide aqueous dispersion, stirring for 10min, and performing ultrasonic treatment for 10min to uniformly disperse the conductive polymer;
2) and then carrying out low-temperature hydrothermal reaction for 12h at the temperature of 95 ℃ to obtain the reduced graphene oxide/conductive polymer composite material.
No formed gel was found. This is because dopamine is self-polymerized into polydopamine under alkaline conditions, and after the polydopamine is attached to the surface of graphene oxide, the polydopamine forms a bridge between the graphene oxide and the conductive polymer, so that the polydopamine is more likely to gel. On the contrary, it is difficult to gel.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A preparation method of reduced graphene oxide/conductive polymer composite gel is characterized by comprising the following steps:
s1, adjusting the pH value of the dopamine hydrochloride solution to 8-9, and marking as a solution A;
s2, adding a conductive polymer into the graphene oxide aqueous dispersion, stirring and performing ultrasonic treatment to uniformly disperse the conductive polymer, and marking as a solution B;
s3, adding the solution A into the solution B, uniformly stirring, carrying out hydrothermal reaction, taking out a product, washing with deionized water, and freeze-drying to obtain the reduced graphene oxide/conductive polymer composite gel.
2. The method according to claim 1, wherein in S1, the adjusted dopamine hydrochloride solution is adjusted in pH using a trihydroxymethane solution.
3. The method of claim 2, wherein the concentration of the trihydroxymethane solution is 2 mg/mL.
4. The method according to claim 1, wherein in S2, the conductive polymer is polypyrrole or polyaniline.
5. The preparation method according to claim 2, wherein in S2, the mass ratio of the conductive polymer to the graphene oxide aqueous dispersion is (1-2): (1-4).
6. The method according to any one of claims 1 to 5, wherein the stirring and ultrasonic treatment are performed for 30 to 45min in S2.
7. The method according to claim 6, wherein in S3, the volume ratio of solution A to solution B is 1: (4-8).
8. The preparation method according to claim 7, wherein the hydrothermal reaction temperature in S3 is 90-100 ℃ and the reaction time is 10-12 h.
9. The preparation method according to claim 1, wherein the graphene oxide aqueous dispersion is prepared by a method comprising:
adding graphene oxide into a cellulose nanocrystal water dispersion liquid with the concentration of 1-10mg/ml, performing ultrasonic dispersion treatment, and then standing for layering to obtain the graphene oxide water dispersion liquid.
10. A reduced graphene oxide/conductive polymer composite gel, which is prepared by the method for preparing a reduced graphene oxide/conductive polymer composite gel according to any one of claims 1 to 9.
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