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Nano metal oxide/MXene heterostructure composite material and preparation method thereof

A nano-metal and heterostructure technology, applied in nanotechnology, structural parts, nanotechnology, etc., can solve the problems of serious MXene agglomeration, oxidative deterioration of MXene, and complicated preparation process, so as to increase the reactive area and improve the utilization rate , various effects

Inactive Publication Date: 2018-10-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the currently reported methods for preparing composite materials, the preparation effect of simple mixing and pumping or mechanical mixing and grinding is poor, and the MXene agglomeration is serious, and it is difficult to form a uniformly dispersed composite structure; while CVD method, hydrothermal method The preparation process of such methods is complicated, the cost is higher, and it is also easy to cause oxidative deterioration of MXene

Method used

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  • Nano metal oxide/MXene heterostructure composite material and preparation method thereof
  • Nano metal oxide/MXene heterostructure composite material and preparation method thereof
  • Nano metal oxide/MXene heterostructure composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Synthesis of MXenes

[0040] Add 0.99g LiF into a plastic bottle containing 10ml hydrochloric acid, stir for 5min to dissolve LiF, then add 1 gTi 3 AlC 2 , stir well. The obtained mixed solution was placed in a 35° C. constant temperature water bath, and stirred and etched for 24 hours. After the etching reaction, add water to the above product and centrifuge repeatedly for 4 times until the supernatant is pH ≈ 6, pour off the supernatant, add water again, sonicate for 30 minutes, and centrifuge for 1 hour to collect the upper solution to obtain the etched MXene solution;

[0041] Measure 5ml of the MXene solution, filter it with suction, dry it and weigh it to obtain a MXene concentration of 2.6mg / ml, and dilute the prepared MXene aqueous solution to 1 mg / ml;

[0042] (2) Synthesis of nano-metal oxide / MXene heterostructure composites

[0043] Take 70mg nanorod TiO 2 In a 500ml Erlenmeyer flask, add 500ml NMP, ultrasonically disperse for 1h,

[0044] Measure 2...

Embodiment 2

[0050] (1) Synthesis of MXenes

[0051] Add 0.99g LiF into a plastic bottle containing 10ml hydrochloric acid, stir for 5min to dissolve LiF, then add 1 gTi 3 AlC 2 , stir well. Put the obtained mixture into a 35°C constant temperature water bath, stir

[0052] Etching 24h. After the etching reaction, add water to the above product and centrifuge repeatedly for 4 times until the supernatant pH ≈ 6, pour off the supernatant, add water again, sonicate for 30 minutes, centrifuge for 1 hour, collect the upper solution, and obtain the etched MXene solution;

[0053] Measure 5ml of the MXene solution, filter it with suction, dry it and weigh it to obtain a MXene concentration of 2.6 mg / ml, and dilute the prepared MXene aqueous solution to 2 mg / ml;

[0054] (2) Synthesis of nano-metal oxide / MXene heterostructure composites

[0055] Take 70mg nanowire SnO 2 In a 500ml Erlenmeyer flask, add 500ml DMF, sonicate for 1h,

[0056] Measure 15ml of MXene aqueous solution, drop by drop...

Embodiment 3

[0062] (1) Synthesis of MXenes

[0063] Add 0.99g LiF into a plastic bottle containing 10ml hydrochloric acid, stir for 5min to dissolve LiF, then add 1 gTi 3 AlC 2 , stir well. The obtained mixed solution was placed in a 35° C. constant temperature water bath, and stirred and etched for 24 hours. After the etching reaction, add water to the above product and centrifuge repeatedly for 4 times until the supernatant pH ≈ 6, pour off the supernatant, add water again, sonicate for 30 minutes, centrifuge for 1 hour, collect the upper solution, and obtain the etched MXene solution;

[0064] Measure 5ml of the MXene solution, filter it with suction, dry it and weigh it to obtain a MXene concentration of 2.6mg / ml, and dilute the prepared MXene aqueous solution to 1 mg / ml;

[0065] (1) Synthesis of nano-metal oxide / MXene heterostructure composites

[0066] Take 70mg Fe 3 o 4 Put quantum dots in a 500ml Erlenmeyer flask, add 500ml THF, ultrasonically disperse for 1h,

[0067] Mea...

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Abstract

The invention provides a nano metal oxide / MXene heterostructure composite material and a preparation method thereof. According to the nano metal oxide / MXene heterostructure composite material, nano metal oxide is adsorbed on the surface of lamella MXene through van der waals force and evenly dispersed on a lamella base material to form the composite material of an integrated structure; metal oxideparticles with the size as 5 to 100nm occupies 10 to 90% of the total mass of the composite material; the nano metal oxide is one or several of TiO2, SnO2, Fe3O4, RuO2 and MnO2; the nano metal oxideis in a shape of one or several of a nanorod shape, a nanowire shape and a quantum dot shape. According to the nano metal oxide / MXene heterostructure composite material disclosed by the invention, thenano metal oxide is evenly dispersed on the MXene lamella, morphology is regular, a proportion is adjustable, and material conductivity is remarkably improved; the preparation method has the advantages of simpleness, lower cost and large-scale preparation; when being applied to lithium ion batteries or super capacitor composite materials, the nano metal oxide / MXene heterostructure composite material has excellent cycling performance and rate capability.

Description

technical field [0001] The invention relates to a nanometer metal oxide / MXene heterostructure composite material and a preparation method thereof. Background technique [0002] Metal oxide materials have high specific capacity, usually 2–3 times higher than that of porous carbon or graphite-based materials, and are a very promising class of electrode materials for secondary batteries and supercapacitors. However, electrode materials prepared from metal oxides usually suffer from low electrical conductivity and large volume expansion during charge and discharge, resulting in cycle stability and rate performance that still cannot meet the needs of practical applications. Combining metal oxides with highly conductive nano-carbon materials (graphene, carbon nanotubes, etc.), porous carbon materials, conductive polymers, etc. is an effective way to improve the electrochemical performance of metal oxides. [0003] Transition metal carbide or nitride, also known as MXene, is a new...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525H01G11/24H01G11/30H01G11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/46H01M4/362H01M4/485H01M4/62H01M4/624H01M10/0525Y02E60/10Y02E60/13
Inventor 徐斌刘一涛张鹏
Owner BEIJING UNIV OF CHEM TECH
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