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a nb 2 o 5 Preparation method and application of nanorods

A nanorod and reaction kettle technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of cumbersome synthesis methods, poor uniformity of nanorods, and high required temperature, and achieve shortened ion diffusion paths and fast charging. Discharge process, uniform effect of nanorod structure

Active Publication Date: 2022-05-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As another example, in 2018, Yan Haibo et al. used potassium fluoroniobate as the source of niobium, and prepared Nb by hydrothermal method. 2 o 5 , although this method uses a single reagent, the temperature required in the process is too high, and the requirements for the instrument are more stringent
Overall, the current Nb 2 o 5 The synthesis method of nanorods is generally cumbersome and has the characteristics of high cost or high energy consumption, and the synthesized Nb 2 o 5 Nanorods have poor uniformity
This to some extent restricts the Nb 2 o 5 Application and popularization of nanorods in industrial production

Method used

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Experimental program
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Effect test

Embodiment 1

[0043] A kind of Nb provided by this embodiment 2 o 5 The preparation method of nano rod, comprises the following steps:

[0044] (1) First add 2 g Nb 2 AlC was placed in 20ml of hydrofluoric acid with a mass fraction concentration of 50%, and etched at room temperature for 90 hours;

[0045](2) Centrifuge the liquid etched in step (1), and wash it repeatedly with deionized water and absolute ethanol until the pH is 6;

[0046] (3) Pour off the supernatant of the product obtained in step (2), remove the lower precipitate and dry it in a vacuum oven to obtain multilayer MXenes;

[0047] (4) The multilayer niobium-based MXenes obtained in step (3) were placed in tetramethylammonium hydroxide solution, and heated and stirred at 25 °C for 24 hours;

[0048] (5) Use a centrifuge to centrifuge the solution obtained in step (4), pour off the upper liquid obtained for the first time, add deionized water to the centrifuge tube, and then sonicate or shake vigorously to redisperse th...

Embodiment 2

[0053] A kind of Nb provided by this embodiment 2 o 5 The preparation method of nano rod, comprises the following steps:

[0054] (1) First add 2 g Nb 2 AlC was placed in 20 ml of 50% hydrofluoric acid and etched at room temperature for 90 hours.

[0055] (2) Centrifuge the liquid etched in step (1), and wash it repeatedly with deionized water and absolute ethanol until the pH is 6;

[0056] (3) Pour off the supernatant of the product obtained in step (2), remove the lower precipitate and dry it in a vacuum oven to obtain multilayer MXenes;

[0057] (4) The multilayer niobium-based MXenes obtained in step (3) were placed in tetramethylammonium hydroxide solution, and heated and stirred at 35 °C for 24 hours;

[0058] (5) Use a centrifuge to centrifuge the solution obtained in step (4), pour off the upper liquid obtained for the first time, add deionized water to the centrifuge tube, and then sonicate or shake vigorously to redisperse the lower layer of MXenes. After centr...

Embodiment 3

[0063] A kind of Nb provided by this embodiment 2 o 5 The preparation method of nano rod, comprises the following steps:

[0064] (1) First add 2 g Nb 2 AlC was placed in 20 ml of 50% hydrofluoric acid and etched at room temperature for 90 hours;

[0065] (2) Centrifuge the liquid etched in step (1), and wash it repeatedly with deionized water and absolute ethanol until the pH is 6;

[0066] (3) Pour off the supernatant of the product obtained in step (2), remove the lower precipitate and dry it in a vacuum oven to obtain multilayer MXenes;

[0067] (4) The multilayer niobium-based MXenes obtained in step (3) were placed in tetramethylammonium hydroxide solution, and heated and stirred at 55 °C for 6 hours;

[0068] (5) Use a centrifuge to centrifuge the solution obtained in step (4), pour off the upper liquid obtained for the first time, add deionized water to the centrifuge tube, and then sonicate or shake vigorously to redisperse the lower layer of MXenes. After centri...

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Abstract

The invention belongs to the technical field of nanomaterial preparation and the field of new energy, in particular to a kind of Nb 2 o 5 Preparation methods and applications of nanorods. The Nb 2 o 5 The diameter and length of the nanorods are 20-100 nm and 100-900 nm, respectively. The preparation method is that multi-layer MXenes are placed in tetramethylammonium hydroxide solution, heated and stirred, and the obtained upper layer solution is a few-layer MXenes solution. The few-layer niobium-based MXenes solution is transferred to a reaction kettle, heated, cooled, centrifuged, and dried to obtain the final product. The invention adopts a simple hydrothermal method to convert two-dimensional MXenes materials into one-dimensional nanorods, and the nanorods have a uniform structure and a high degree of crystallization. When used as a negative electrode material for lithium-ion capacitors, due to the nano-sized structure, the ion diffusion path can be shortened, thereby showing a faster charge-discharge process and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of nanomaterial technology and the field of new energy, in particular to a kind of Nb 2 o 5 Preparation methods and applications of nanorods. [0002] technical background [0003] Lithium-ion capacitor is a new type of electrochemical energy storage device. The positive electrode is made of porous carbon material of electric double layer capacitor, and the negative electrode is made of embedded lithium-ion battery negative electrode material, so it has the dual characteristics of both battery and capacitor. Compared with lithium-ion batteries, it has higher power density and more stable cycle performance, and compared with electric double layer capacitors, it has higher energy density. At present, the biggest problem in lithium-ion capacitors is the unbalanced reaction kinetics between positive and negative electrodes. Finding a high-power negative electrode material is the key to solving this problem. [0004] Two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00H01G11/06H01G11/24H01G11/46H01G11/50B82Y30/00B82Y40/00
CPCC01G33/00H01G11/06H01G11/24H01G11/46H01G11/50B82Y30/00B82Y40/00C01P2004/16C01P2004/64C01P2004/62C01P2002/30Y02E60/13
Inventor 原长洲秦理刘洋侯林瑞徐森炀
Owner UNIV OF JINAN