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Hydrophilic polythiophene grafted oxidized graphene supercapacitor electrode material and preparation method thereof

A technology for supercapacitors and electrode materials, which is applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc. Effect of surface area, excellent specific capacitance

Active Publication Date: 2019-02-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention introduces the pseudocapacitive material polythiophene into the graphene sheet structure to form a composite material, and utilizes the synergistic effect of the two to improve the shortcomings of low specific capacitance and low energy density of single graphene and single polythiophene as electrode materials, and at the same time improve the cycle. stability

Method used

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  • Hydrophilic polythiophene grafted oxidized graphene supercapacitor electrode material and preparation method thereof
  • Hydrophilic polythiophene grafted oxidized graphene supercapacitor electrode material and preparation method thereof
  • Hydrophilic polythiophene grafted oxidized graphene supercapacitor electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Add graphene oxide (25mg) into a solution of thionyl chloride (5mL), ultrasonically disperse for 40min, and then heat and reflux for 4 hours. After the reaction is completed, the excess thionyl chloride is distilled off to obtain surface acid chlorinated Graphene oxide.

[0024] (2) Hydrophilic polythiophene (n=1, 25 mg) was dissolved in anhydrous tetrahydrofuran, then acid-chlorinated graphene oxide was added, and ultrasonically dispersed for 40 min.

[0025] (3) Triethylamine (5 mL) was added into the reaction system as an acid-binding agent. The mixture was stirred and reacted at room temperature under nitrogen protection for 24 hours. After the reaction, it was centrifuged, washed with ethanol and deionized water for 3 times, and dried in vacuum for 24 hours to obtain a polythiophene (n=1) grafted graphene oxide composite material.

[0026] (4) Preparation of electrode material: Grind the composite material finely, then mix it with the mass ratio of composite m...

Embodiment 2

[0029] (1) Add graphene oxide (25 mg) into a solution of thionyl chloride (10 mL), ultrasonically disperse it for 20 minutes, and then heat and reflux for 4 hours. After the reaction is completed, the excess thionyl chloride is distilled off to obtain surface acid chlorinated Graphene oxide.

[0030] (2) Hydrophilic polythiophene (n=2, 25 mg) was dissolved in anhydrous tetrahydrofuran, followed by addition of acid-chlorinated graphene oxide, and ultrasonically dispersed for 40 min.

[0031] (3) Triethylamine (10 mL) was added into the reaction system as an acid-binding agent. The mixture was stirred and reacted at room temperature under nitrogen protection for 36 hours. After the reaction, it was centrifuged, washed with ethanol and deionized water three times, and dried in vacuum for 24 hours to obtain a graphene oxide composite material grafted with polythiophene (n=2).

[0032] (4) Preparation of electrode material: Grind the composite material finely, then mix it with the...

Embodiment 3

[0035] (1) Add graphene oxide (25 mg) into a solution of thionyl chloride (10 mL), ultrasonically disperse it for 20 minutes, and then heat and reflux for 4 hours. After the reaction is completed, the excess thionyl chloride is distilled off to obtain surface acid chlorinated Graphene oxide.

[0036] (2) Hydrophilic polythiophene (n=4, 25 mg) was dissolved in anhydrous tetrahydrofuran, followed by addition of acid-chlorinated graphene oxide, and ultrasonically dispersed for 40 min.

[0037] (3) Triethylamine (10 mL) was added into the reaction system as an acid-binding agent. The mixture was stirred and reacted at room temperature under nitrogen protection for 36 hours. After the reaction, it was centrifuged, washed with ethanol and deionized water for 3 times, and dried in vacuum for 24 hours to obtain a graphene oxide composite material grafted with polythiophene (n=4).

[0038] (4) Preparation of electrode material: Grind the composite material finely, then mix it with the...

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Abstract

The invention discloses a hydrophilic polythiophene grafted oxidized graphene supercapacitor electrode material and a preparation method thereof. According to the method, long-chain alkoxy alcohol amino substituted polythiophene and oxidized graphene are used as raw materials and grafted through esterification to prepare hydrophilic polythiophene grafted oxidized graphene nanosheets. The compositeelectrode material is controllable morphologically, polythiophene is uniformly grafted on the oxidized graphene, and large specific surface area, excellent electrical conductivity, stable chemical properties and the like are realized. By synergistic effects of polythiophene and oxidized graphene, contraction and expansion of active substances in charging and discharging processes can be effectively retarded, the specific capacitance is increased, current impedance is reduced, and cycle stability is improved. The material can be used as an ideal new-energy device electrode material for supercapacitors, high-performance electro-catalytic materials, lithium ion batteries and the like.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a supercapacitor electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the continuous consumption of fossil energy, and the increasing environmental pollution, it is becoming more and more important to study a high-efficiency, low-cost, environmentally friendly, and high-performance energy conversion and storage system. Due to the advantages of high capacitance, high energy density, long cycle life, fast charging and discharging, and environmental friendliness, supercapacitors have gradually replaced traditional petrochemical raw materials. To meet the needs of life, the development of lightweight and flexible energy storage devices with high energy density, high cycle stability and low cost has become the main choice of new energy. [0003] The performance of supercapacitors mainly depends on the super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/48B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/36H01G11/48Y02E60/13
Inventor 李月琴周敏雅夏宗彪龚强
Owner NANJING FORESTRY UNIV
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