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A graphene/wse 2 /nife-ldh aerogel and its preparation

A graphene and aerogel technology, which is 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 achieves reduction of Agglomeration, excellent electrochemical performance, easy mass production effect

Active Publication Date: 2022-08-05
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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  • A graphene/wse <sub>2</sub> /nife-ldh aerogel and its preparation
  • A graphene/wse <sub>2</sub> /nife-ldh aerogel and its preparation
  • A graphene/wse <sub>2</sub> /nife-ldh aerogel and its preparation

Examples

Experimental program
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preparation example Construction

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

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

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

[0043] S11, in an ice bath with vigorous stirring, the NaNO 3 Dissolved in concentrated sulfuric acid until NaNO 3 completely dissolved.

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

[0045] S12, maintain the ice bath, add graphite pow...

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 ultrasonicate for 1 hour to obtain a tan GO sheet dispersion with a GO concentration of 2 mg mL -1 .

[0075] (2) Ultra-thin WSe 2 Preparation of nanosheet dispersion: 20 mg of bulk WSe 2 Add 4mL volume fraction of 60% isopropanol (IPA) / water (V / V, 6 / 4) mixed solvent, put it into a sonicator, sonicate at a power of 200W and a frequency of 40kHz 4 h, the temperature during sonication was kept at room temperature by adding circulating cooling water. Subsequently, the sonicated solution was centrifuged at 4000 rpm for 20 minutes to remove the unstripped bulk WSe at the bottom. 2 , the supernatant obtained is the two-dimensional WSe 2 Nanosheets, the concentration of which is about 0.5 mg / mL is tested for use.

[0076] (3) Prepa...

Embodiment 2

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

[0087] Prepared graphene / WSe 2 / Layered NiFe-LDH aerogel was tested, and the obtained graphene / WSe 2 / Layered NiFe-LDH aerogel has good rate performance, good pseudocapacitance characteristics, and the capacitance value retention rate: 91.5%.

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Abstract

The present invention relates to a kind of graphene / WSe 2 / NiFe-LDH aerogel and preparation method thereof, said method comprising: mixing graphene oxide sheet dispersion liquid and WSe 2 Mix the nanosheet dispersion, add at least one of a reducing agent, a crosslinking agent and a pH adjuster, mix evenly, and react to obtain graphene / WSe 2 Hydrogel, freeze-dried to obtain graphene / WSe 2 Aerogel; the graphene / WSe 2 Aerogels soaked in NiFe‑LDH nanosheet dispersion to prepare graphene / WSe 2 / NiFe‑LDH hydrogel, freeze-dried to obtain graphene / WSe 2 / NiFe‑LDH aerogel. The N, S co-doped graphene / WSe prepared by the invention 2 / NiFe-LDH (N,S co-doped graphene / tungsten diselenide / nickel-iron double hydroxide) preparation method, the preparation is simple, the cost is low, and the prepared N, S co-doped graphene / WSe 2 / NiFe‑LDH has excellent electrochemical properties such as large specific capacitance, good cycle performance, and low internal resistance.

Description

technical field [0001] The invention relates to an electrode material, in particular to a graphene / WSe 2 / NiFe-LDH aerogel and preparation method thereof. Background technique [0002] With the rapid development of the economy and the increase of the global population, the deteriorating environment and the increasing scarcity of energy have attracted widespread attention 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 people's attention. Among them, supercapacitor is a new type of energy storage device, which 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 very important to prepare suitable electrode materials. Stud...

Claims

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Application Information

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Patent Type & Authority Patents(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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