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Two-dimensional layered nitrogen-doped Ti<3>C<2> ''paper'' nanocomposite and preparation method therefor, and method for preparing composite electrode by employing nanocomposite

A nano-composite material, two-dimensional layered technology, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing and other directions, can solve problems such as low specific capacitance, and achieve the effects of expanding layer spacing, improving utilization, and low cost

Active Publication Date: 2016-11-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is worth noting that in organic electrolytes, alkaline electrolytes, and neutral electrolytes, the specific capacitance of the material is lower than that in acidic electrolytes because there is no nitrogen involved in the pseudocapacitive reaction.

Method used

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  • Two-dimensional layered nitrogen-doped Ti&lt;3&gt;C&lt;2&gt; ''paper'' nanocomposite and preparation method therefor, and method for preparing composite electrode by employing nanocomposite
  • Two-dimensional layered nitrogen-doped Ti&lt;3&gt;C&lt;2&gt; ''paper'' nanocomposite and preparation method therefor, and method for preparing composite electrode by employing nanocomposite
  • Two-dimensional layered nitrogen-doped Ti&lt;3&gt;C&lt;2&gt; ''paper'' nanocomposite and preparation method therefor, and method for preparing composite electrode by employing nanocomposite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites involves:

[0031] Step 1: Two-dimensional layered Ti 3 C 2 Preparation of nanomaterials;

[0032] Synthesize two-dimensional layered Ti according to the method of patent 201410812056.7 3 C 2 nanomaterials;

[0033] Step 2: Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites;

[0034] First, take 300mg of Ti from Step 2 3 C 2 Add the nano-powder to 10 g of urea aqueous solution with a mass concentration of 50%, and stir evenly at 60°C;

[0035] Then, add ultrapure water to dilute to Ti 3 C 2 500 times the mass, with a frequency of 60Hz, ultrasonic dispersion for 6h;

[0036] Secondly, centrifuge and wash with ultrapure water and absolute ethanol, centrifuge at 5000rpm for 4min each time to obtain separated solids, and dry them in vacuum at 80°C to obtain two-dimensional layered Ti 3 C 2 "Paper" nanomaterials;

[0037] Again, put Ti 3 ...

Embodiment 2

[0046] Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites involves:

[0047] Step 1: Two-dimensional layered Ti 3 C 2 Preparation of nanomaterials;

[0048] Synthesize two-dimensional layered Ti according to the method of patent 201410812056.7 3 C 2 nanomaterials;

[0049] Step 2: Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites;

[0050] First, take 1000mg of Ti from step 2 3 C 2 The nano-powder is added to 30 g of urea aqueous solution with a mass concentration of 50%, and stirred evenly at 50°C;

[0051] Then, add ultrapure water to dilute to Ti 3 C 2 300 times the mass, with a frequency of 40Hz, ultrasonic dispersion for 4h;

[0052] Secondly, centrifuge and wash with ultrapure water and absolute ethanol, centrifuge at 7000rpm for 3min each time to obtain separated solids, and dry them in vacuum at 60°C to obtain two-dimensional layered Ti 3 C 2 "Paper" nanomaterials;

[0053] Again, p...

Embodiment 3

[0061] Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites involves:

[0062] Step 1: Two-dimensional layered Ti 3 C 2 Preparation of nanomaterials;

[0063] Synthesize two-dimensional layered Ti according to the method of patent 201410812056.7 3 C 2 nanomaterials;

[0064] Step 2: Two-dimensional layered nitrogen-doped Ti 3 C 2 Preparation of "paper" nanocomposites;

[0065] First, take 1800mg of Ti from Step 2 3 C 2 The nano-powder is added to 50 g of urea aqueous solution with a mass concentration of 50%, and stirred evenly at 70°C;

[0066] Then, add ultrapure water to dilute to Ti 3 C 2 700 times the mass, with a frequency of 80Hz, ultrasonic dispersion for 5h;

[0067] Secondly, centrifuge and wash with ultrapure water and absolute ethanol, centrifuge at 4000rpm for 4min each time to obtain separated solids, and dry them in vacuum at 120°C to obtain two-dimensional layered Ti 3 C 2 "Paper" nanomaterials;

[0068] Again, ...

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Abstract

The invention discloses a two-dimensional layered nitrogen-doped Ti<3>C<2> ''paper'' nanocomposite and a preparation method therefor, and a method for preparing a composite electrode by employing the nanocomposite. The Ti<3>C<2> nanomaterial is used as a substrate; the two-dimensional layered nitrogen-doped Ti<3>C<2> ''paper'' nano composite electrode material is prepared by steps of urea chemical stripping, thermal treatment and nitrogen doping; and the composite electrode material is applied to an electrochemical capacitor. Compared with other reported preparation methods, the method provided by the invention can control the layered stripping and the nitrogen element doping of a laminated sheet in a convenient, rapid, environment-friendly and safe manner; the Ti<3>C<2> is stripped by urea, so that the number of layers of the Ti<3>C<2> nanosheets can be reduced and the spacing between the layers can be enlarged; therefore, the specific surface area is enlarged; the Ti<3>C<2> nanosheets are further layered through nitrogen doping, so that the conductivity of the material is improved, and the utilization rate of the pseudocapacitance active site is increased; and finally, the specific capacity, the rate capability and other electrochemical performances of the Ti<3>C<2> composite electrode are enhanced.

Description

technical field [0001] The invention belongs to the field of nano functional materials and electrochemical energy storage devices, in particular to a two-dimensional layered nitrogen-doped Ti 3 C 2 "Paper" nanocomposite material, method for its preparation, and method for preparing composite electrodes using the material. Background technique [0002] Two-dimensional layered transition metal carbide Ti 3 C 2 Nanomaterials are based on the use of ternary layered Ti 3 AlC 2 The difference in the force between the compound layers is obtained by peeling off the Al layer by corrosion. This kind of nanomaterial has a two-dimensional structure similar to graphene (Graphene), which is called MXene. MXene has a unique graphene-like structure, large specific surface area, good electrical conductivity, hydrophilicity and other properties, making it widely used in adsorption, photocatalysis, lithium-ion batteries, solar cells, biosensors, etc. As a new type of energy storage mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 阙文修杨晨辉汤袆尹行天杨亚威阙美丹
Owner XI AN JIAOTONG UNIV
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