Three-dimensional porous MXene/graphene composite membrane and preparation method and application thereof

A graphene composite, three-dimensional porous technology, applied in the field of electrode materials, can solve the problems of slow construction, increased cost, and decreased material performance.

Inactive Publication Date: 2020-07-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main construction methods are spray drying and electrospinning, but the above two methods require additional solvents, and the construction speed is slow, which increases the cost
Existing construction methods also use easy-to-remove templates to construct three-dimensional structures. The templates can be easily sublimated ice templates, sulfur templates, or polymer materials that are easy to pyrolyze, such as polystyrene, etc., but this method The introduced foreign template needs to be removed, and the removal time is long. At the same time, it may react with MXene during the removal process, resulting in a decrease in material performance

Method used

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  • Three-dimensional porous MXene/graphene composite membrane and preparation method and application thereof
  • Three-dimensional porous MXene/graphene composite membrane and preparation method and application thereof
  • Three-dimensional porous MXene/graphene composite membrane and preparation method and application thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of three-dimensional porous MXene / graphene composite membrane, comprises the following steps:

[0033] Provide the dispersion liquid of single-layer MXene and the dispersion liquid of single-layer graphene oxide;

[0034] After mixing the dispersion of single-layer MXene and the dispersion of single-layer graphene oxide, the obtained mixed dispersion is formed into a film to obtain a MXene / graphene oxide composite film;

[0035] The MXene / graphene oxide composite membrane is subjected to a self-propagating reduction reaction to obtain a three-dimensional porous MXene / graphene composite membrane.

[0036] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0037] The invention provides a dispersion liquid of single-layer MXene and a dispersion liquid of single-layer graphene oxide. In the present invention, the ...

Embodiment 1

[0072] (1) Preparation of a dispersion of monolamellar MXene

[0073] Mix 2gLiF with 20mL hydrochloric acid with a mass concentration of 9mol / L, and stir at a speed of 60r / min for 10min to obtain an etching solution;

[0074] 2 g of Ti with an average particle size of 50 μm 3 AlC 2 Mix with the etchant, after ultrasonic 5min under the power of 600W, the Ti 3 AlC 2 The mixture with the etching solution was placed in a constant temperature water bath at 35°C, and stirred and reacted at a speed of 60r / min for 24h; , the time is 10min), repeat the operation 8 times, pour off the supernatant to obtain MXene;

[0075] Mix 100 mg MXene with 100 mL deionized water, sonicate at 600 W for 30 min, centrifuge at 3000 relative centrifugal force for 1 h, collect the upper layer solution, and obtain a 1 mg / mL single-layer MXene dispersion.

[0076] (2) Preparation of a dispersion of monolithic graphene oxide

[0077] After mixing 3.5 g of graphite powder with an average particle size o...

Embodiment 2

[0086] (1) Preparation of a dispersion of monolamellar MXene

[0087] Mix 2gLiF with 20mL of hydrochloric acid with a mass concentration of 12mol / L, and stir at a speed of 90r / min for 10min to obtain an etching solution;

[0088] 2 g of Ti with an average particle size of 50 μm 3 AlC 2 Mix with the etchant, after ultrasonic 5min under the power of 600W, the Ti 3 AlC 2The mixture with the etching solution was placed in a constant temperature water bath at 35°C, and stirred and reacted at a speed of 90r / min for 24h; , the time is 10min), repeat the operation 8 times, pour off the supernatant to obtain MXene;

[0089] Mix 100mg of MXene with 100mL of deionized water, sonicate for 20min at a power of 600W, centrifuge at a relative centrifugal force of 3000 for 1h, collect the upper layer solution, and obtain a 1mg / mL single-layer MXene dispersion.

[0090] (2) Preparation of a dispersion of monolithic graphene oxide

[0091] After mixing 3.5 g of graphite powder with an aver...

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a three-dimensional porous MXene / graphene composite membrane and a preparation method and application thereof. The invention provides a preparation method of a three-dimensional porous MXene / graphene composite membrane. The preparation method comprises the following steps: providing a dispersion liquidof single-lamella MXene and a dispersion liquid of single-lamella graphene oxide; mixing the dispersion liquid of the single-lamella MXene and the dispersion liquid of the single-lamella graphene oxide to obtain a mixed dispersion liquid, and forming a membrane to obtain an MXene / graphene oxide composite membrane; and carrying out a self-propagating reduction reaction on the MXene / graphene oxidecomposite membrane to obtain the three-dimensional porous MXene / graphene composite membrane. According to the preparation method disclosed by the invention, the three-dimensional porous MXene / graphenecomposite membrane can be rapidly prepared, and the three-dimensional porous MXene / graphene composite membrane has relatively high specific capacitance and excellent rate capability when being applied to a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a three-dimensional porous MXene / graphene composite film and its preparation method and application. Background technique [0002] Supercapacitor is a high-power electrochemical energy storage device, because it only involves the enrichment and diffusion of charge on the electrode surface thin layer solution during charge and discharge, and does not involve ion migration inside the solid phase, so it has excellent large capacity. Current charge and discharge performance. Supercapacitors are widely used in sudden high-power occasions due to their rapid and efficient charging and discharging, such as starting power supply and braking energy recovery of large machinery. However, the existing carbon-based supercapacitors cannot meet the existing applications due to their low specific energy and limited by the low conductivity of carbon. Therefore, finding ne...

Claims

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Application Information

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IPC IPC(8): H01G11/28H01G11/34H01G11/86
CPCH01G11/28H01G11/34H01G11/86Y02E60/13
Inventor 徐斌缪佳炜
Owner BEIJING UNIV OF CHEM TECH
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