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Rapid preparation method of NiMoO4/C nanofibers

A nanofiber and fast technology, applied in the field of electrochemistry, can solve the problems of insufficient electrochemical stability, unavailable capacitance, poor rate performance, etc., and achieve good cycle stability, easy process operation, and controllable finished products Effect

Active Publication Date: 2017-05-31
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiMoO prepared by hydrothermal method 4 And its loaded products often have problems such as large resistance, poor rate performance, and insufficient electrochemical stability, or the products obtained by loading are often loaded unevenly or only on the surface. In the electrochemical performance test, regardless of the resistance There is still a lot of room for improvement in cycle stability.
And the NiMoO obtained after loading 4 Compounds are faced with the problem that the specific capacitance cannot be exerted

Method used

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  • Rapid preparation method of NiMoO4/C nanofibers
  • Rapid preparation method of NiMoO4/C nanofibers
  • Rapid preparation method of NiMoO4/C nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Weigh (NH 4 ) 6 Mo 7 o 24 4H 2 O 0.3708g, Ni(Ac) 2 4H 2 O 0.5226g, citric acid 0.3152g, join in 10ml DMF solvent, ultrasonic vibration 10min, stir to obtain green transparent dispersion solution, the mass percentage that metal salt solute accounts for total solution is 7.5%;

[0019] Step 2: Add 1.3g of PVP in a mass percentage of 10.8% of the total solution to the green transparent dispersion solution obtained in Step 1, and stir until uniform and transparent to obtain a green transparent liquid to be reacted. The stirring time is 9 hours;

[0020] Step 3: Electrospinning the green transparent liquid to be reacted obtained in Step 2, the distance between the positive and negative poles of electrospinning is 15cm, the electric field is 17kV, and the spinning speed is 0.04mm / min to obtain a light green polymer metal salt Composite fibers were vacuum dried in a vacuum oven at 50°C for 12 hours;

[0021] Step 4: Calcinate the vacuum-dried product of step 3 i...

Embodiment 2

[0024] Step 1: Weigh (NH 4 ) 6 Mo 7 o 24 4H 2 O 0.4943g, Ni(Ac) 2 4H 2 O 0.6967g, citric acid 0.4203g, join in 10ml DMF solvent, ultrasonic vibration 15min, stir to obtain green transparent dispersion solution, the mass percentage that metal salt solute accounts for total solution is 9.6%;

[0025] Step 2: Add 1.3g of PVP in a mass percentage of 10.5% of the total solution to the green transparent dispersion solution obtained in Step 1, and stir until uniform and transparent to obtain a green transparent liquid to be reacted. The stirring time is 10 hours;

[0026] Step 3: Electrospinning the green transparent liquid to be reacted obtained in Step 2. The distance between the positive and negative poles of electrospinning is 20cm, the electric field is 15kV, and the spinning speed is 0.05mm / min to obtain a light green polymer metal salt Composite fibers were vacuum dried in a vacuum oven at 50°C for 12 hours;

[0027] Step 4: Calcinate the vacuum-dried product of step 3 ...

Embodiment 3

[0030] Step 1: Weigh (NH 4 ) 6 Mo 7 o 24 4H 2 O 0.6179g, Ni(Ac) 2 4H 2O 0.8709g, citric acid 0.5254g, join in 10ml DMF solvent, ultrasonic vibration 20min, stir to obtain green transparent dispersion solution, the mass percent of metal salt solute accounting for total solution is 11.7%;

[0031] Step 2: Add 1.3g of PVP in a mass percentage of 10.2% of the total solution to the green transparent dispersion solution obtained in Step 1, and stir until uniform and transparent to obtain a green transparent liquid to be reacted. The stirring time is 11 hours;

[0032] Step 3: Electrospinning the green transparent liquid to be reacted obtained in Step 2. The distance between the positive and negative poles of electrospinning is 20cm, the electric field is 12kV, and the spinning speed is 0.05mm / min to obtain a light green polymer metal salt Composite fibers were vacuum dried in a vacuum oven at 50°C for 12 hours;

[0033] Step 4: Calcinate the vacuum-dried product of step 3 in ...

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Abstract

The invention discloses a preparation method of a nanocomposite, and particularly provides a rapid preparation method of NiMoO4 / C nanofibers. The rapid preparation method of the NiMoO4 / C nanofibers comprises the following steps: step 1, (NH4)6Mo7O24.4H2O, Ni(Ac)2.4H2O and citric acid are added to a DMF solvent, the mixture is ultrasonically oscillated and stirred, and a disperse solution is obtained; step 2, PVP is added to the disperse solution and stirred to be uniform, and a to-be-reacted solution is obtained; step 3, the obtained to-be-reacted solution is subjected to electrospinning, and polymer metal salt composite fibers are obtained and dried in a vacuum manner; step 4, the product dried in a vacuum manner is calcined in air and decomposed at a high temperature, and the NiMoO4 / C nanofibers are obtained. A NiMoO4 / C nanocomposite with good continuity can be prepared with the method for preparing the NiMoO4 / C nanofibers through electrospinning. The product has excellent electrochemical performance, and electrical conductivity and cycle performance of the product are improved by introducing C, so that the product has better application prospect in the field of energy storage.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, and relates to a preparation method of a nanocomposite material, which rapidly prepares NiMoO 4 / C nanofibers. Background technique [0002] In recent years, nanomaterials with special microscopic morphology have broad application prospects due to their important characteristics such as small size effect, surface and interface effect, and quantum size effect, and are favored by researchers. As a mixed metal oxide nanomaterial, molybdate has the advantages of abundant resources, simple preparation, good stability, and environmental friendliness. The optimization and improvement of performance plays an important role in the fields of catalysts, magnetic materials, sensors, photoluminescence, and energy storage. NiO 4 The preparation of nanomaterials mainly includes sol-gel method, solid-phase synthesis method, hydrothermal synthesis method, co-precipitation method, combustion method, im...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/00
CPCD01D5/0015D01F9/08
Inventor 朱俊武张健力汪信李严温丰胡入丹张悦钱惺悦
Owner NANJING UNIV OF SCI & TECH
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