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Method for preparing porous molybdenum carbide nanofiber by adopting electrostatic spinning

An electrospinning and nanofiber technology, applied in the field of nanomaterials, can solve the problems of insufficient reaction, harsh conditions, low yield, etc., and achieves low cost of process conditions, simple and easy-to-control preparation conditions, good application and industrialization prospects. Effect

Inactive Publication Date: 2015-02-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods for preparing precursor nanowires have problems such as harsh conditions, insufficient reaction, low yield, and small output.

Method used

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  • Method for preparing porous molybdenum carbide nanofiber by adopting electrostatic spinning
  • Method for preparing porous molybdenum carbide nanofiber by adopting electrostatic spinning
  • Method for preparing porous molybdenum carbide nanofiber by adopting electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing porous molybdenum carbide nanofibers by electrospinning, comprising the steps of:

[0033] (1) 1.24 grams of ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in 5ml distilled water to obtain ammonium molybdate solution (the molar concentration of molybdenum atom is about 1.4mol / L);

[0034] (2) 20 gram PVA powders are dissolved in 100 gram hot water, are made into the PVA solution of 20wt%;

[0035] (3) Ammonium molybdate solution is added to dissolve in 6.2 grams of PVA solution, and the mass ratio of PVA and ammonium molybdate in the mixed solution is about 1:1;

[0036] (4) Move the mixed solution to a syringe, install it on an electrospinning micropump, and connect the needle of the syringe to a high-voltage power supply;

[0037] (5) Regulate micropump injection speed 0.1ml / h, set high voltage 15kV, continue spinning for 1 hour, obtain white electrospun fiber on negative electrode collection plate, as figure 1 and figure 2 ...

Embodiment 2

[0043] A method for preparing porous molybdenum carbide nanofibers by electrospinning, comprising the steps of:

[0044] (1) 1.86 grams of ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H2 O is dissolved in 5ml distilled water to obtain ammonium molybdate solution (the molar concentration of molybdenum atom is about 2.1mol / L);

[0045] (2) 20 gram PVA powders are dissolved in 100 gram hot water, are made into the PVA solution of 20wt%;

[0046] (3) Ammonium molybdate solution is added to dissolve in 6.2 grams of PVA solution, and the mass ratio of PVA and ammonium molybdate in the mixed solution is about 2:1;

[0047] (4) Move the mixed solution to a syringe, install it on an electrospinning micropump, and connect the needle of the syringe to a high-voltage power supply;

[0048] (5) Adjust the micropump injection speed to 0.1ml / h, set high voltage 15kV, continue spinning for 1 hour, and obtain white electrospun fibers on the negative electrode collecting plate;

[0049] (6) Pu...

Embodiment 3

[0051] A method for preparing porous molybdenum carbide nanofibers by electrospinning, comprising the steps of:

[0052] (1) 0.62 grams of ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in 5ml distilled water to obtain ammonium molybdate solution (the molar concentration of molybdenum atom is about 0.7mol / L);

[0053] (2) 20 gram PVA powders are dissolved in 100 gram hot water, are made into the PVA solution of 20wt%;

[0054] (3) Add the ammonium molybdate solution to 6.2 grams of PVA solution for dissolving, so that the mass ratio of PVA and ammonium molybdate in the mixed solution is about 1:2;

[0055] (4) Move the mixed solution to a syringe, install it on an electrospinning micropump, and connect the needle of the syringe to a high-voltage power supply;

[0056] (5) Adjust the micropump injection speed to 0.1ml / h, set high voltage 15kV, continue spinning for 1 hour, and obtain white electrospun fibers on the negative electrode collecting plate;

[0057...

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Abstract

The invention discloses a method for preparing a porous molybdenum carbide nanofiber by adopting electrostatic spinning, and belongs to the technical field of nano materials. The method comprises the following steps: with water-soluble molybdate as a molybdenum source, and a water-soluble high-molecular polymer as a carbon source, dissolving and evenly mixing the water-soluble molybdate and the water-soluble high-molecular polymer at room temperature; and preparing a molybdate nano fiber by adopting an electrostatic spinning method; burning in an inert atmosphere or a reducing atmosphere; and simultaneously achieving high-temperature thermal decomposition, reduction and carbonization, so as to obtain the porous molybdenum carbide nanofiber in one step. According to the method, cheap molybdate and water-soluble high-molecular polymer are taken as raw materials; the method is artfully combined with a relatively mature electrostatic spinning technology in industry; and the method is high in preparation efficiency and product quality, low in cost, simple and easy to control, friendly to environment, free of pollution, and suitable for industrial production, and has important application value and industrial prospect in a plurality of fields such as catalysts, electrode materials, super capacitors and sensors.

Description

technical field [0001] The invention relates to a method for preparing nanofibers, in particular to a method for preparing porous molybdenum carbide nanofibers by electrospinning, and belongs to the technical field of nanomaterials. Background technique [0002] Molybdenum carbide has high melting point, high hardness, good electrical and thermal conductivity and extremely high thermal and chemical stability. In recent years, it has become one of the most promising catalytic materials due to its unique noble metal-like electronic structure and catalytic performance, anti-sulfur and anti-carbon deposition properties. In particular, molybdenum raw materials are relatively cheap and easy to obtain, which is of great significance in saving precious metal resources and reducing the cost of catalytic reactions. At present, the application of carbide catalysts represented by transition metals such as molybdenum in methanol fuel cells, hydrodesulfurization and hydrodenitrogenation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D01F6/56D01F6/66D01D5/00
Inventor 赵丽萍
Owner SHANGHAI JIAO TONG UNIV
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