CN111524721A - Preparation process and product of modified graphene with super-capacitive performance - Google Patents
Preparation process and product of modified graphene with super-capacitive performance Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 8
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000007248 oxidative elimination reaction Methods 0.000 claims abstract description 5
- 239000000047 product Substances 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000000502 dialysis Methods 0.000 claims description 7
- 238000010335 hydrothermal treatment Methods 0.000 claims description 6
- -1 nitrogen-containing compound Chemical class 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000012286 potassium permanganate Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims description 2
- 239000004202 carbamide Substances 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- KBLZDCFTQSIIOH-UHFFFAOYSA-M tetrabutylazanium;perchlorate Chemical compound [O-]Cl(=O)(=O)=O.CCCC[N+](CCCC)(CCCC)CCCC KBLZDCFTQSIIOH-UHFFFAOYSA-M 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- 239000007772 electrode material Substances 0.000 abstract description 12
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 125000005842 heteroatom Chemical group 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000002484 cyclic voltammetry Methods 0.000 description 4
- LOKCTEFSRHRXRJ-UHFFFAOYSA-I dipotassium trisodium dihydrogen phosphate hydrogen phosphate dichloride Chemical compound P(=O)(O)(O)[O-].[K+].P(=O)(O)([O-])[O-].[Na+].[Na+].[Cl-].[K+].[Cl-].[Na+] LOKCTEFSRHRXRJ-UHFFFAOYSA-I 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000002953 phosphate buffered saline Substances 0.000 description 3
- 238000001132 ultrasonic dispersion Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/32—Carbon-based
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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Abstract
The invention discloses a preparation process of modified graphene with super-capacitive performance, which comprises the following steps: 1) preparing nitrogen-doped reduced graphene oxide; 2) oxidative cleavage and grafting of MnO to N-RGO2(ii) a 3) For MnO grafted2Carrying out hydrothermal deoxidation on the oxidized and cut N-RGO; concentrating and drying to obtain the modified graphene material. The invention relates to a method for preparing graphene oxide by mixing graphene with heteroatom N and metal oxide MnO2Grafting the graphene and the graphene, and then stripping the graphene into graphene quantum dots by a hydrothermal deoxidation method so as to be used as a capacitance electrode material. The process not only solves the problems of easy accumulation and incomplete reduction of the graphene, but also effectively improves the specific capacitance capacity of the modified graphene in the aspect of application of the graphene as a super-capacitance electrode material, and has good cycle stability.
Description
Technical Field
The invention belongs to a capacitor electrode material, and particularly relates to a preparation process of modified graphene with super-capacitive performance.
Background
The super capacitor is a novel energy storage element which is researched more at present, and has the excellent characteristics of large specific capacitance, high cycle stability, rapid charging and discharging process and the like, so that the super capacitor is widely applied to the aspects of electric energy storage and conversion. The electrode material of the super capacitor is the core technology of the super capacitor.
The graphene has excellent conductivity, flexibility and mechanical property and a large specific surface area, and can be used as an electrode material of a double-layer super capacitor. However, graphene oxide or reduced graphene oxide are easy to stack in the preparation process, and the dispersibility and surface wettability of the graphene material in the electrolyte are affected. The effective specific surface area and the conductivity of the graphene material are reduced. Therefore, avoiding graphene stacking is one of the technical difficulties in preparing graphene-based supercapacitors with high energy density and high power density.
The graphene serving as a novel nano material has good conductivity and a large specific surface area, and can be used as an electrode material of a super capacitor. However, the existing research shows that the double-layer capacitance cannot be fully exerted due to the characteristic that graphene is easy to aggregate. The graphene is modified and compounded by other conductive substances, so that the unique advantages of the graphene can be kept, and other performances such as the conductivity, the cycling stability and the like of the electrode material can be improved.
In view of the above technical current situation, the exploration of the application potential of graphene as a supercapacitor electrode material is still a research hotspot of the technology in the field, and particularly the exploration of the highest electrochemical efficiency, the optimal performance and the lowest cost of the electrode material can be realized in view of the synthesis process of composite materials.
Disclosure of Invention
Aiming at the technical defects that graphene is easy to accumulate and the double-electric-layer capacitance cannot be fully exerted in the prior art, the invention aims to provide a preparation process of modified graphene with super-capacitive performance, which can effectively solve the problem of graphene accumulation and improve the super-capacitive performance.
In order to achieve the above object, the present invention specifically provides the following technical solutions:
1. a preparation process of modified graphene with super-capacitive performance comprises the following steps:
1) preparing nitrogen-doped reduced graphene oxide;
taking graphene oxide as a raw material, and using a nitrogen-containing compound as a nitrogen source to carry out nitrogen doping on the graphene oxide to obtain nitrogen-doped reduced graphene oxide, wherein the label of the nitrogen-doped reduced graphene oxide is N-RGO;
2) oxidizing and cutting N-RGO and grafting MnO 2;
putting N-RGO in concentrated nitric acid or concentrated sulfuric acid to realize chemical oxidative cleavage, and further adding KMnO4To realize MnO2Grafting is introduced into the oxidized and cut N-RGO;
3) for MnO grafted2Carrying out hydrothermal deoxidation on the oxidized and cut N-RGO;
and (3) carrying out de-oxidation on the oxidized and cut N-RGO in a hydrothermal environment, removing impurity ions by dialysis with a dialysis bag, and concentrating and drying to obtain the modified graphene material.
Preferably, the nitrogen-containing oxide in step 1) is one or more of N-methylpyrrolidone, urea, ammonia water, ammonium oxalate or tetrabutylammonium perchlorate.
Preferably, the specific process in the step 1) is as follows: preparing graphene oxide into a GO solution by using deionized water, preparing a nitrogen-containing compound solution by using deionized water, mixing the two solutions, and carrying out hydrothermal treatment at 160-200 ℃ for 10-14 h.
Preferably, the GO solution has a concentration of 0.2mg/ml, the nitrogen-containing compound solution has a concentration of 0.5mg/ml, and the two are mixed in a volume ratio of 1: 1.
Preferably, the specific process in the step 2) is as follows: weighing N-RGO20mg prepared in the step 1), putting into 100mL deionized water, ultrasonically dispersing for 2h, dropwise adding 5mL concentrated sulfuric acid, continuously ultrasonically dispersing for 0.5h, and then adding 50mL0.2M KMnO4The aqueous solution is stirred and reacted for 12 hours to realize MnO2The graft is introduced into the oxidatively cleaved N-RGO.
Preferably, the specific process in the step 3) is as follows: performing hydrothermal treatment on the product obtained in the step 2) at 180 ℃ for 12h, putting the product into a dialysis bag, dialyzing the product with deionized water for 24h, changing water every 6h, and then putting the product into an oven to dry the product at 80 ℃ for 4h to obtain the final product.
2. The modified graphene with the super-capacitive performance is prepared according to the process.
The invention has the beneficial effects that: the invention relates to a method for preparing graphene oxide by mixing graphene with heteroatom N and metal oxide MnO2Grafting the graphene and the graphene, and then stripping the graphene into graphene quantum dots by a hydrothermal deoxidation method so as to be used as a capacitance electrode material. The process not only solves the problems of easy accumulation and incomplete reduction of the graphene, but also effectively improves the specific capacitance capacity of the modified graphene in the aspect of application of the graphene as a super-capacitance electrode material, and has good cycle stability.
Drawings
FIG. 1 is a cyclic voltammogram of modified graphene deposited on a copper electrode for different scan cycles;
FIG. 2 is a plot of cyclic voltammetry for copper electrodes deposited with modified graphene films at different scan speeds;
fig. 3 is a constant current charge and discharge curve diagram of the modified graphene film.
Detailed Description
The technical solution of the present invention will be further described with reference to the drawings and specific examples in the specification:
example 1
The modified graphene is prepared by the following steps:
1) preparing nitrogen-doped reduced graphene oxide;
dispersing 20mg of graphene oxide in 100mL of deionized water, and performing ultrasonic dispersion for 0.5h to prepare a GO solution of 0.2 mg/mL; then, 50mg of N-methylpyrrolidone was weighed and dispersed in 100mL of deionized water to dissolve it, and a 0.5mg/mL N-methylpyrrolidone solution was prepared. Mixing the prepared GO solution and the N-methylpyrrolidone solution 1:1, mixing, and carrying out hydrothermal treatment at 180 ℃ for 12h to obtain nitrogen-doped reduced graphene oxide which is marked as N-RGO;
2) oxidative cleavage and grafting of MnO to N-RGO2；
The N-RGO20mg prepared in the first step is weighed and put into 100mL deionized water for ultrasonic dispersion for 2 h. 5mL of concentrated sulfuric acid is added dropwise, and ultrasonic dispersion is continued for 0.5 h. Then 50mL0.2M KMnO was added4Aqueous solution. Stirring and reacting for 12h to realize MnO2Grafting is introduced into the oxidized and cut N-RGO;
3) for MnO grafted2Carrying out hydrothermal deoxidation on the oxidized and cut N-RGO;
and (3) carrying out hydrothermal treatment on the product obtained in the second step at 180 ℃ for 12h, then putting the product into a dialysis bag, dialyzing the product for 24h with deionized water, changing water every 6h, then putting the product into an oven, drying the product for 4h at 80 ℃, concentrating and drying the product to obtain the modified graphene material.
In the preparation process, the phenomenon that graphene is easy to accumulate in the prior art is avoided, and the whole process is easy to operate.
The modified graphene material prepared in example 1 is deposited on a copper electrode in an electrodeposition manner, and the specific electrodeposition steps are as follows: 0.1g of modified graphene material is weighed and placed into 100mL of Phosphate Buffered Saline (PBS) (pH9.8), and ultrasonic stripping is carried out for 3 hours, so as to obtain uniform and stable modified graphene dispersion liquid. The dispersion liquid is used as an electrolyte, and a three-electrode system is adopted on an electrochemical workstation CHI660C (Shanghai Chenghua), a copper electrode is used as a working electrode, a platinum foil electrode is used as an auxiliary electrode, and a Saturated Calomel Electrode (SCE) is used as a reference electrode, so that the modified graphene is electrodeposited on the copper electrode. Scanning potential range: 1.5-0.6V, scan speed: 50mv.s-1The number of scanning turns: 1-15 circles.
FIG. 1 is a cyclic voltammogram of modified graphene deposited on a copper electrode for different scan cycles; as can be seen from fig. 1, an oxidation peak appears near-0.3V, and a reduction peak appears near-0.02V, corresponding to the reaction process of the residual GO in the modified graphene that is reduced to graphene. The scanning response peak current is obviously increased along with the increase of the number of scanning turns, the CV area is increased, and the modified graphene is continuously deposited on the electrode, and the capacitance of the film is also increased along with the increase of the number of scanning turns. Further, as can be seen from the figure, the oxidation peak potential tends to move negatively and the reduction peak potential tends to move positively as the number of scanning turns increases, so that the peak potential difference slightly increases as the number of scanning turns increases. This indicates that as the number of cycles increases, the thickness of the deposited modified graphene film increases, with a slight decrease in the conductivity of the film.
Fig. 2 shows CV test charts of the prepared modified graphene film at different scanning speeds, and the electrolytic solution system is PBS solution of 0.067M, pH ═ 9.8. The experiment still adopts a three-electrode system, the prepared copper electrode deposited with the modified graphene film is used as a working electrode, the platinum foil electrode is used as a counter electrode, and the saturated calomel electrode is used as a reference electrode. As can be seen from fig. 2, the CV curve is a rectangle similar to the standard, and no redox peak appears, indicating that the prepared graphene film has typical electric double layer capacitance characteristics and good reversibility; with the increase of the scanning speed, the scanning response current platform is increased, the rectangular area of the CV curve is increased, and the film has the characteristics of good multiplying power performance, good high-current rapid charging and discharging stability and high capacitance retention rate.
Figure 3 shows the modified graphene membrane prepared at 0.5ma-2Charge-discharge curve of 5 cycles at the charge current density of (a). As can be seen from fig. 3, the single charge-discharge curve is in an approximately standard isosceles triangle shape, the symmetry is good, and the voltage changes linearly with time, which indicates that the modified graphene film has typical double-layer capacitance performance, and is consistent with the cyclic voltammetry test result. And the curve of repeated charge and discharge for many times is basically unchanged, which shows that the charge and discharge performance of the film is stable, the reversibility is good, and the capacitance retention rate is high (the experimental result shows that the capacitance retention rate of 50 repeated charge and discharge is approximately 100%). In addition, as can be seen from fig. 3, the charge and discharge time of the film is very fast, which indicates that the prepared modified graphene film has good charge and discharge performance.
The experiments further prove that the modified graphene has higher specific capacitance capacity and good cycle stability in the application aspect of being used as the super-capacitor electrode material.
Finally, the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A preparation process of modified graphene with super-capacitive performance is characterized by comprising the following steps:
1) preparing nitrogen-doped reduced graphene oxide;
taking graphene oxide as a raw material, and using a nitrogen-containing compound as a nitrogen source to carry out nitrogen doping on the graphene oxide to obtain nitrogen-doped reduced graphene oxide, wherein the label of the nitrogen-doped reduced graphene oxide is N-RGO;
2) oxidative cleavage and grafting of MnO to N-RGO2；
Putting N-RGO in concentrated nitric acid or concentrated sulfuric acid to realize chemical oxidative cleavage, and further adding KMnO4To realize MnO2Grafting is introduced into the oxidized and cut N-RGO;
3) for MnO grafted2Carrying out hydrothermal deoxidation on the oxidized and cut N-RGO;
and (3) carrying out de-oxidation on the oxidized and cut N-RGO in a hydrothermal environment, removing impurity ions by dialysis with a dialysis bag, and concentrating and drying to obtain the modified graphene material.
2. The process according to claim 1, wherein the nitrogen-containing oxide in step 1) is one or more of N-methylpyrrolidone, urea, ammonia, ammonium oxalate or tetrabutylammonium perchlorate.
3. The preparation process of the modified graphene with the super-capacitive performance according to claim 1, wherein the specific process in the step 1) is as follows: preparing graphene oxide into a GO solution by using deionized water, preparing a nitrogen-containing compound solution by using deionized water, mixing the two solutions, and carrying out hydrothermal treatment at 160-200 ℃ for 10-14 h.
4. The preparation process of the modified graphene with the super-capacitive performance, according to claim 3, wherein the concentration of the GO solution is 0.2mg/ml, the concentration of the nitrogen-containing compound solution is 0.5mg/ml, and the two are mixed in a volume ratio of 1: 1.
5. The preparation process of the modified graphene with the super-capacitive performance according to claim 1, wherein the specific process in the step 2) is as follows: weighing N-RGO20mg prepared in the step 1), putting into 100mL deionized water, ultrasonically dispersing for 2h, dropwise adding 5mL concentrated sulfuric acid, continuously ultrasonically dispersing for 0.5h, and then adding 50mL0.2M KMnO4The aqueous solution is stirred and reacted for 12 hours to realize MnO2The graft is introduced into the oxidatively cleaved N-RGO.
6. The preparation process of the modified graphene with the super-capacitive performance according to claim 1, wherein the specific process in the step 3) is as follows: performing hydrothermal treatment on the product obtained in the step 2) at 180 ℃ for 12h, putting the product into a dialysis bag, dialyzing the product with deionized water for 24h, changing water every 6h, and then putting the product into an oven to dry the product at 80 ℃ for 4h to obtain the final product.
7. Modified graphene with super-capacitive properties prepared by the process of any one of claims 1 to 6.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930992A (en) * | 2012-11-12 | 2013-02-13 | 上海交通大学 | Preparation method of composite electrode materials of graphene doping nitrogen and manganese dioxide |
| US20140087192A1 (en) * | 2012-09-24 | 2014-03-27 | Agency For Science, Technology And Research | Conducting polymer/graphene-based material composites, and methods for preparing the composites |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140087192A1 (en) * | 2012-09-24 | 2014-03-27 | Agency For Science, Technology And Research | Conducting polymer/graphene-based material composites, and methods for preparing the composites |
| CN102930992A (en) * | 2012-11-12 | 2013-02-13 | 上海交通大学 | Preparation method of composite electrode materials of graphene doping nitrogen and manganese dioxide |
Non-Patent Citations (2)
| Title |
|---|
| 吕生华等: "石墨烯基超级电容器的研究进展", 《功能材料》 * |
| 葛烨楠等: "聚苯胺接枝石墨烯复合材料的制备及电化学性能", 《印染助剂》 * |
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