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
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[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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