Graphene/WSe2/NiFe-LDH aerogel and preparation thereof

A graphene and aerogel technology, applied in the field of graphene/WSe2/NiFe-LDH aerogel and its preparation, can solve the problems of volume shrinkage of active substances, poor cycle stability, and unsatisfactory performance, and reduce the Agglomeration, excellent electrochemical performance, easy mass production effect

Active Publication Date: 2019-01-15
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the in-depth research on the structure and performance of LDH, it has been found that this kind of material has both electric double layer and pseudocapacitance properties, showing attractive development prospects in the field of energy storage, but due to the During the charge and discharge process, the metal elements in the electrode material continue to undergo oxidation-reduction reactions, causing the volume of the active material to shrink and expand, resulting in poor cycle stability.
[0006] Although the above materials show certain supercapacitive properties when used as individual electrode materials, their performance is not ideal.

Method used

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  • Graphene/WSe2/NiFe-LDH aerogel and preparation thereof
  • Graphene/WSe2/NiFe-LDH aerogel and preparation thereof
  • Graphene/WSe2/NiFe-LDH aerogel and preparation thereof

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preparation example Construction

[0040] like figure 1 Shown, the N, S co-doped graphene / WSe of preferred embodiment of the present invention 2 The preparation method of / NiFe-LDH comprises:

[0041] S1, ultrasonically disperse graphite oxide in deionized water to prepare a graphene oxide lamellar dispersion. Preferably, the concentration of the prepared graphene oxide dispersion is 0.5-3mg mL -1 , more preferably 2mg mL -1 .

[0042] Specifically, the graphite oxide is prepared by the following method:

[0043] S11, under ice bath and vigorous stirring, NaNO 3 Dissolve in concentrated sulfuric acid until NaNO 3 completely dissolved.

[0044] For example: adding concentration to the three-necked reaction flask is 98% concentrated sulfuric acid (H 2 SO 4 ), and the reaction bottle was placed in an ice-water bath and stirred at 150rpm, adding NaNO 3 , continue to stir under the ice-water bath. Wherein, the concentrated sulfuric acid and NaNO 3 The weight ratio is: 60:1~100:1.

[0045] S12, maintain i...

Embodiment 1

[0073] A N, S co-doped graphene / WSe 2 / NiFe-LDH preparation method, such as figure 1 shown, including:

[0074] (1) Preparation of graphene oxide (GO) dispersion: disperse 100 mg of the graphite oxide prepared above in 100 mL of deionized water, and sonicate for 1 hour to obtain a tan GO lamellar dispersion with a GO concentration of 2 mg mL -1 .

[0075] (2) Ultra-thin WSe 2 Preparation of nanosheet dispersion: 20 mg bulk WSe 2 Add 4 mL of isopropanol (IPA) / water (V / V, 6 / 4) mixed solvent with a volume fraction of 60%, put it into an ultrasonic instrument and perform ultrasonic vibration treatment with a power of 200W and a frequency of 40kHz 4 Hours, the temperature was kept at room temperature during sonication by adding circulating cooling water. Subsequently, the sonicated solution was centrifuged at 4000 rpm for 20 min to remove unstripped bulk WSe at the bottom 2 , the supernatant obtained is two-dimensional WSe 2 Nanosheets, the concentration of which is about 0....

Embodiment 2

[0086] The reaction and operating conditions of this embodiment and embodiment 1 are basically the same, the difference is that the reducing agent L-cysteine ​​in embodiment 1 is replaced by ascorbic acid.

[0087] The prepared graphene / WSe 2 / Layered NiFe-LDH airgel is tested, and the prepared graphene / WSe 2 / Layered NiFe-LDH airgel has good rate performance, good pseudocapacitive characteristics, and the capacitance value retention rate: 91.5%.

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Abstract

The invention relates to a graphene / WSe2 / NiFe-LDH aerogel and a preparation method thereof. The preparation method comprises following steps: mixing graphene oxide sheet dispersion liquid and WSe2 nano sheet dispersion liquid; adding at least one of a reducing agent, a crosslinking agent, and a pH adjuster, evenly mixing, carrying out reactions to obtain graphene / WSe2 hydrogel, freeze-drying the hydrogel to obtain graphene / WSe2 aerogel; soaking the graphene / WSe2 aerogel in NiFe-LDH nano sheet dispersion liquid to prepare graphene / WSe2 / NiFe-LDH hydrogel, and carrying out freeze-drying to obtaingraphene / WSe2 / NiFe-LDH aerogel. The provided N,S co-doped graphene / WSe2 / NiFe-LDH (N,S co-doped graphene / tungsten diselenide / NiFe-LDH) preparation method is simple, the cost is low, and the preparedN,S co-doped graphene / WSe2 / NiFe-LDH has excellent electrochemical properties such as large specific capacitance, good cycle performance, small internal resistance, and the like.

Description

technical field [0001] The invention relates to an electrode material, in particular to a graphene / WSe 2 / NiFe-LDH airgel and its preparation method. Background technique [0002] With the rapid development of the economy and the increase of the global population, the continuous deterioration of the environment and the increasing scarcity of energy have aroused widespread concern from people from all walks of life around the world. The search for sustainable, clean and efficient renewable energy materials has undoubtedly become a hot spot of concern. Among them, supercapacitor is a new type of energy storage device. It has the advantages of high power density, long cycle life, fast charging and discharging process, and low cost. It has become a research hotspot and has good application prospects in various fields. The quality of its performance mainly depends on the selection of electrode materials, so it is of great significance to prepare suitable electrode materials. St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B19/00C01G53/00H01G11/30H01G11/36
CPCH01G11/30H01G11/36C01B19/007C01B32/184C01G53/00C01P2006/40C01P2002/72C01P2004/03Y02E60/13
Inventor 徐小威贾润萍燕飞刘珂丁学渊
Owner SHANGHAI INST OF TECH
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