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Vanadium oxide nanosheet and preparation method of two-dimensional composite material of vanadium oxide nanosheet and MXene

A technology of vanadium oxide and composite materials, applied in chemical instruments and methods, vanadium oxide, carbide, etc., can solve the problems of low yield, unsatisfactory product shape, limited energy storage capacity of composite materials, etc., and achieve wide layer spacing , good universality and high yield, good shape characteristics

Pending Publication Date: 2022-03-11
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing vanadium oxide nanosheets to solve the problems of low yield and unsatisfactory product form in the preparation method of vanadium oxide nanosheets
[0008] Another object of the present invention is to provide a method for preparing a two-dimensional composite material of vanadium oxide nanosheets and MXene, so as to solve the problem of limited energy storage capacity of existing composite materials

Method used

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  • Vanadium oxide nanosheet and preparation method of two-dimensional composite material of vanadium oxide nanosheet and MXene
  • Vanadium oxide nanosheet and preparation method of two-dimensional composite material of vanadium oxide nanosheet and MXene
  • Vanadium oxide nanosheet and preparation method of two-dimensional composite material of vanadium oxide nanosheet and MXene

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Embodiment 1

[0052] Step A-Step D of this embodiment is the process of preparing vanadium oxide nanosheets (HVO-NS).

[0053] Step E-step G is to prepare the two-dimensional composite material (V 5 o 12 ·nH 2 O@MXene) process, because the raw material of the latter is prepared by the aforementioned steps, so it is carried out as a whole test in the embodiment.

[0054] A preparation method of vanadium oxide nanosheets, prepared according to the following steps:

[0055] Step A, vanadium source dispersion;

[0056] Weigh 2g of V as the source of vanadium 2 o 5 ·H 2 O was added to 450 mL of deionized water to form 0.022 mol / L of V 2 o 5 Suspension, then add 45mL of 30% hydrogen peroxide solution and 8 drops of ethylene glycol (measured to be about 0.4mL), then transfer the mixture into a water bath, and carry out constant temperature magnetic stirring at 60 °C For 2 hours, the vanadium source was evenly dispersed.

[0057] Step B, nucleation and growth of vanadium oxide;

[0058] ...

Embodiment 2

[0073] The difference with Example 1 is:

[0074] The vanadium source that weighs in the step A is the V of 2.133g 2 o 5 , the added deionized water is 250mL, finally forming V with a molar concentration of 0.047mol / L 2 o 5 Suspension; add hydrogen peroxide to a volume of 190mL; add 12 drops of ethylene glycol (measured to be about 0.6mL); in a water bath, carry out constant temperature magnetic stirring at 50°C for 3 hours to uniformly disperse the vanadium source.

[0075] In step B, the temperature of the water bath heating is 50° C., and the temperature is kept for 20 hours.

[0076] In step C, the temperature for heat preservation is 50° C.; the time for constant temperature ultrasonication is 1 hour; the centrifugation index of the suspension is: the rotating speed is 3000 r / min, and the time is 0.5 hour.

[0077] Similarly, the obtained upper layer suspension is the successfully exfoliated vanadium oxide nanosheets (HVO-NS), accounting for about 75%-85% of the total...

Embodiment 3

[0084] The difference with Example 1 is:

[0085] The vanadium source that weighs in the step A is the V of 2.133g 2 o 5 , the added deionized water is 450mL, finally forming a molar concentration of 0.026mol / L V 2 o 5 Suspension; add hydrogen peroxide to a volume of 90mL; add 9 drops of ethylene glycol (measured to be about 0.5mL); in a water bath, perform constant temperature magnetic stirring at 50°C for 3.5 hours to disperse the vanadium source evenly.

[0086] In step B, the temperature of the water bath heating is 50° C., and the temperature is kept for 30 hours.

[0087] In step C, the temperature for heat preservation is 50° C.; the time for constant temperature ultrasonication is 3 hours; the centrifugation index of the suspension is: rotation speed 1500 r / min, time 1 hour.

[0088] Similarly, the obtained upper layer suspension is the successfully exfoliated vanadium oxide nanosheets (HVO-NS), accounting for about 75%-85% of the total mass of vanadium oxide. The...

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Abstract

The invention discloses a vanadium oxide nanosheet and a preparation method of a two-dimensional composite material of the vanadium oxide nanosheet and MXene. The preparation method of the vanadium oxide nanosheet comprises the following steps: dispersing a vanadium source, nucleating and growing vanadium oxide, preparing a vanadium oxide (V5O12.nH2O) nanosheet, and freeze-drying a product. The preparation method of the two-dimensional composite material of the vanadium oxide nanosheets and the MXene comprises the following steps: pre-treating the vanadium oxide nanosheets with positive electricity, self-assembling and compounding the vanadium oxide nanosheets with positive electricity and the MXene nanosheets with negative electricity, centrifugally washing and freeze-drying. According to the preparation method of the vanadium oxide nanosheet, a template agent does not need to be added any more, and the yield of the obtained nanosheet can be increased to 75% or above. When the two-dimensional composite material of the vanadium oxide nanosheet and the MXene is applied to an aqueous zinc ion battery, due to the interface effect of the composite material, the actual capacity exceeding the theoretical capacity of V5O12.nH2O is shown.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion battery materials, and in particular relates to a preparation method of a vanadium oxide nanosheet and a two-dimensional composite material thereof and MXene. Background technique [0002] In the field of aqueous zinc-ion batteries, methods for preparing vanadium oxide nanoarrays and ultrathin titanium carbide nanosheets have been published in Chinese patents CN105271407A "A Vanadium Oxide Nanoarray and Its Preparation Method" and CN109569494A "A MXene-Ti 3 C 2 The preparation method and application of nanosheets are respectively disclosed in ". [0003] The former forms vanadium oxide nanosheets and then self-assembles to form vanadium oxide nanoarrays through hydrothermal synthesis. However, this method needs to be completed under the action of a specific template agent, and the so-called self-stacking of vanadium oxide nanoarrays is serious. , Thick sheets and long preparation cy...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01B32/921C01B32/914C01B32/19B82Y30/00B82Y40/00H01M4/36H01M4/48H01M10/36
CPCC01G31/02C01B32/921C01B32/914C01B32/19B82Y30/00B82Y40/00H01M4/362H01M4/48H01M10/36H01M2004/028C01P2002/72C01P2004/04C01P2004/03C01P2004/64C01P2004/80Y02E60/10
Inventor 黄娟娟肖保全陈杰杨文静胡长发彭尚龙闫德
Owner LANZHOU UNIVERSITY
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