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MnO2 nanobelt/nitrogen-doped graphene aerogel composite material for supercapacitor as well as preparation method and application of MnO2 nanobelt/nitrogen-doped graphene aerogel composite material

A nitrogen-doped graphene, supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problem of damage to the conductivity and structural stability of composite materials, poor conductivity and structural stability of composite materials , graphene-carbon skeleton structural integrity damage and other problems, to achieve the effect of being conducive to rapid transmission, improving electrochemical performance, and excellent supercapacitor performance

Active Publication Date: 2021-09-07
SHANDONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, MnO used in supercapacitors 2 The preparation method of / graphene composite material mainly contains following several kinds: 1, through KMnO 4 Reduced by the reducing carbon skeleton of graphene to generate MnO 2 Preparation of composite materials, for example: Chinese patent documents CN111463020A, CN110534355A, CN109390161A, CN110581028A, CN109192529A, CN108172408A, etc. all use the reducing carbon skeleton of graphene to convert KMnO 4 Reduction to MnO 2 , to get MnO 2 / graphene composite material, but the above method is in the reduction process, the integrity of the graphene carbon skeleton structure is destroyed, resulting in damage to the electrical conductivity and structural stability of the composite material; 2, through MnO 2 Nanomaterials and graphene are directly mixed to prepare composite materials, such as: Chinese patent documents CN110739159A, CN111653435A, CN111732095A, CN107026026A, CN109065367A, CN107887179A, CN108455573A, but in the above method, MnO 2 There is a lack of strong chemical bonding with graphene, and the advantages of graphene cannot be fully utilized, and the resulting composite material has poor electrical conductivity and structural stability; 3. Composite materials are prepared by electrochemical deposition, for example: Chinese patent documents CN111710534A, CN110970234A , CN107316752A, etc. use the electrochemical deposition method to MnO 2 Deposited on graphene materials, but the electrodeposition method cannot guarantee MnO 2 The dispersion uniformity of nanomaterials and the need for electrodeposition devices restrict the promotion of preparation methods

Method used

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  • MnO2 nanobelt/nitrogen-doped graphene aerogel composite material for supercapacitor as well as preparation method and application of MnO2 nanobelt/nitrogen-doped graphene aerogel composite material
  • MnO2 nanobelt/nitrogen-doped graphene aerogel composite material for supercapacitor as well as preparation method and application of MnO2 nanobelt/nitrogen-doped graphene aerogel composite material
  • MnO2 nanobelt/nitrogen-doped graphene aerogel composite material for supercapacitor as well as preparation method and application of MnO2 nanobelt/nitrogen-doped graphene aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of MnO for supercapacitor 2 The preparation method of nanobelt / nitrogen-doped graphene airgel composite material comprises steps as follows:

[0046] (1) To 7.5mL concentration is 5.3mg mL -1 Add 12.5mL of Tris-HCl buffer solution (concentration is 0.1mol L -1 , pH is 8.5), fully stirred and mixed evenly, then added 20mg of dopamine, ultrasonicated for 40min, oscillated for 10min, after mixing evenly, the resulting mixture was transferred to a 50mL autoclave, and reacted at 180°C for 12h; after the reaction was completed, poly Dopamine-reduced graphene oxide hydrogel, the obtained polydopamine-reduced graphene oxide hydrogel was washed 5 times with pure water, freeze-dried at -65°C for 72h, and then heat-treated at 800°C for 3h under Ar atmosphere, The obtained nitrogen-doped graphene airgel is denoted as NGA.

[0047] (2) Add 30.0mg of the nitrogen-doped graphene airgel obtained in step (1) into 50mL with a concentration of 2.6mg mL -1 KMnO 4 In the solutio...

Embodiment 2

[0064] A kind of MnO for supercapacitor 2 The preparation method of the nanobelt / nitrogen-doped graphene airgel composite is as described in Example 1, except that the reaction time in step (3) is 21 min.

[0065] The MnO prepared in this example 2 SEM images of nanobelt / nitrogen-doped graphene airgel composites Figure 9 As shown in a, from Figure 9 a It can be seen that MnO 2 Nanoribbons grow uniformly on nitrogen-doped graphene aerogels.

[0066] The MnO prepared in this example 2 The nanoribbon / nitrogen-doped graphene airgel composite was tested for electrochemical performance, and it was assembled into a solid-state ASC for performance testing. The method is as described in Example 1.

[0067] In a three-electrode system, at 0.5A g -1 Current density, MnO 2 The specific capacitance of the nanoribbon / nitrogen-doped graphene airgel composite is 647.5 F g -1 . MNRs / NGA / / AC ASC at 0.5A g -1 The specific capacitance corresponding to the current density is 158.2Fg -...

Embodiment 3

[0069] A kind of MnO for supercapacitor 2 The preparation method of the nanobelt / nitrogen-doped graphene airgel composite is as described in Example 1, except that the reaction time in step (3) is 14 minutes.

[0070] The MnO prepared in this example 2 SEM images of nanobelt / nitrogen-doped graphene airgel composites Figure 9 As shown in b, from Figure 9 b It can be seen that the MnO 2 Nanoribbons grow uniformly on nitrogen-doped graphene aerogels.

[0071] The MnO prepared in this example 2 The nanoribbon / nitrogen-doped graphene airgel composite was tested for electrochemical performance, and it was assembled into a solid-state ASC for performance testing. The method is as described in Example 1.

[0072] In a three-electrode system, at 0.5A g -1 Current density, MnO 2 The specific capacitance of the nanoribbon / nitrogen-doped graphene airgel composite is 643.1 F g -1 . MNRs / NGA / / AC ASC at 0.5A g -1 The specific capacitance corresponding to the current density is 15...

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Abstract

The invention provides a MnO2 nanobelt / nitrogen-doped graphene aerogel composite material for a supercapacitor as well as a preparation method and application of the MnO2 nanobelt / nitrogen-doped graphene aerogel composite material. According to the method, nitrogen-doped graphene aerogel with a large specific surface and a hierarchical pore structure is prepared through a hydrothermal reaction, then KMnO4 is adsorbed, MnSO4 is added to reduce the KMnO4 adsorbed on the nitrogen-doped graphene aerogel, and the MnO2 nanobelt with a high surface unit cell exposure ratio is obtained. Due to strong chemical bonding between the MnO2 nanobelt and the nitrogen-doped graphene aerogel, the structural stability and the cycling stability are improved; the rapid transmission of electrons is facilitated, and the electrochemical performance is improved. The MnO2 nanobelt / nitrogen-doped graphene aerogel composite material with the protected carbon skeleton has super capacitor performance such as excellent specific capacitance, specific energy, specific power and cycling stability.

Description

technical field [0001] The invention relates to a kind of MnO for supercapacitor 2 The nanobelt / nitrogen-doped graphene airgel composite material and its preparation method and application belong to the technical field of supercapacitor energy storage materials. Background technique [0002] As a new type of energy storage device, supercapacitors have the advantages of high energy density, long cycle life, and short charging time. The field has broad application prospects. [0003] MnO 2 Has a theoretical specific capacitance (1370.0F g -1 ), excellent electrochemical performance, and low cost, are widely used in supercapacitor electrode materials. However, MnO 2 Poor conductivity leads to low capacitive performance, which limits its further application in the field of supercapacitors. Graphene has the advantages of good electrical conductivity and large theoretical specific surface area, and nitrogen doping can provide p electrons to the π electron system of graphene,...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/24H01G11/32H01G11/30H01G11/86
CPCH01G11/46H01G11/24H01G11/32H01G11/30H01G11/86Y02E60/13
Inventor 张人杰姜日娟谢贝贝张勇
Owner SHANDONG UNIV
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