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Preparation method for supercapacitor material MoO2/graphene/g-C3N4

A technology of supercapacitors and graphene, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, nanotechnology for materials and surface science, etc., can solve the problem of insufficient performance of supercapacitor electrodes and the cost of precursor carbon materials High, unstable structure and other issues, to achieve the effect of improving cycle charge and discharge stability, good cycle stability, and low cost

Active Publication Date: 2018-03-27
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the existing single-phase MoO 2 Due to the problems of unstable structure, low specific capacity, high cost of precursor carbon materials, and insufficient excellent performance of composited with carbon materials for supercapacitor electrodes, the present invention provides a supercapacitor material MoO 2 / graphene / g-C 3 N 4 The preparation method of this method is low in cost, and the obtained composite material significantly improves the specific capacity of the supercapacitor, and has good cycle charge and discharge stability

Method used

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  • Preparation method for supercapacitor material MoO2/graphene/g-C3N4

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Embodiment 1

[0032] 14 mg of graphene oxide microchips were dispersed in 14 ml of deionized water for 30 min using a cell pulverizer to obtain a 1 mg / ml graphene oxide dispersion. Dissolve 0.84g of sodium molybdate dihydrate and 2.1g of sodium salicylate in 28ml of deionized water, stir magnetically for 10 minutes to fully dissolve it, and mix it with the graphene oxide dispersion to obtain a mixed solution. Mo in solution 2+ The molar ratio to the capping agent is 1:4, and the concentration of the capping agent in the mixed solution is 0.3mol / L. Then use hydrochloric acid to adjust the pH to 1.5, transfer it to a 100ml hydrothermal kettle for hydrothermal reaction, heat it at 180°C for 24 hours, and after natural cooling, centrifuge at 5000rpm for 10min, wash with deionized water and ethanol three times, Dry in vacuum at ℃ for 24h. If this is done, and then directly annealed, MoO can be obtained 2 Composite graphene material, graphene accounts for MoO 2 3.1% of the mass of composite g...

Embodiment 2

[0035] 10 mg of graphene oxide microchips were dispersed in 15 ml of deionized water for 0.5 h using a cell pulverizer to obtain a 0.67 mg / ml graphene oxide dispersion. Dissolve 0.84g of sodium molybdate dihydrate and 2.1g of sodium salicylate in 31ml of deionized water respectively, stir magnetically for 10min to fully dissolve it, and then mix it with the graphene oxide dispersion to obtain a mixed solution. Mo in solution 2+ The molar ratio to the capping agent is 0.5:5, and the concentration of the capping agent in the mixed solution is 0.28mol / L. The pH was adjusted to 1.5 with hydrochloric acid, transferred to a 50ml hydrothermal kettle, heated at 180°C for 24h, cooled naturally, centrifuged at 5000rpm for 10min, washed with deionized water and ethanol three times, and dried in vacuum at 80°C for 24h. If you do this, you can get MoO by annealing directly. 2 Composite graphene material, graphene accounts for MoO 2 2.2% of the mass of composite graphene. The vacuum-dri...

Embodiment 3

[0038] 22 mg of graphene oxide microchips were dispersed in 20 ml of deionized water for 0.5 h using a cell grinder to obtain a 1.1 mg / ml graphene oxide dispersion. Dissolve 0.84g of sodium molybdate dihydrate and 2.1g of sodium salicylate in 20ml of deionized water, stir magnetically for 10min to fully dissolve it, and then mix it with the graphene oxide dispersion to obtain a mixed solution. Mo in solution 2+ The molar ratio to the capping agent is 1.5:3, and the concentration of the capping agent in the mixed solution is 0.33mol / L. The pH was adjusted to 1.5 with hydrochloric acid, transferred to a 50ml hydrothermal kettle, heated at 180°C for 24h, naturally cooled, centrifuged at 5000rpm for 10min, washed with deionized water and ethanol three times, and dried in vacuum at 80°C for 24h. If this is done, and then directly annealed, MoO can be obtained 2 Composite graphene material, graphene accounts for MoO 2 4.7% of the mass of composite graphene. The vacuum-dried samp...

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Abstract

The invention discloses a preparation method for a supercapacitor material MoO2 / graphene / g-C3N4, and belongs to the technical field of composite material preparation. The method comprises the following steps: 1), scattering oxidized graphene into deionized water, employing a cell pulverizer for smashing, adding mixed solution composed of a molybdenum salt precursor and an end-capping reagent, carrying out the stirring of the mixed solution, enabling the mixed solution to be uniform, and obtaining an oxidized graphene-molybdenum salt-sodium salt mixed solution system; 2), adjusting pH value andthen carrying out the hydro-thermal reaction in a reaction still; 3), employing water and ethyl alcohol for cleaning, carrying out the low-temperature vacuum drying, and obtaining an MoO2 composite oxidized graphene material; 4), mechanically mixing the MoO2 composite oxidized graphene material with a carbon and nitrogen precursor, carrying out the high-temperature calcination of the mixture under the protective atmosphere of high temperature argon gas, cooling the mixture to the room temperature, and then obtaining the MoO2 / graphene / g-C3N4 composite material. The method is simple and feasible, and is low in cost. The specific capacity of an obtained composite material supercapacitor is remarkably enlarged, and the composite material supercapacitor is good in cyclic charging and discharging stability.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a supercapacitor material MoO 2 / graphene / g-C 3 N 4 method of preparation. Background technique [0002] A supercapacitor is a new type of capacitor, also called an electric double layer capacitor or a farad capacitor. It does not undergo chemical reactions during the energy storage process and is a green energy source. The capacity of the supercapacitor is generated by the electric double layer formed by ion conduction, and the capacity of the Farad level is achieved in a small volume. Compared with batteries, no special charging circuit and control discharge circuit are needed, overcharging and overdischarging will not have a negative impact on its life, the number of charging and discharging can reach 500,000 times, the internal resistance is small, and the power density is the number of lithium-ion batteries. More than ten times, it can discharge wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/36H01G11/30B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00H01G11/30H01G11/36H01G11/46
Inventor 张以河白李琦孙黎张雨
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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