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Nitrogen-doped carbon/titanium dioxide composite nanofibers carrier preparation method

A technology of composite nanofibers and titanium dioxide, which is applied in catalyst carriers, chemical instruments and methods, chemical characteristics of fibers, etc., can solve the problems of reducing catalyst activity, electrical conductivity, uneven distribution, weak interaction, etc., and achieves good application prospects. The effect of improving corrosion resistance and simple method

Inactive Publication Date: 2016-12-21
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In such a preparation process, the interaction between titanium dioxide and carbon fiber is very weak, and the distribution of titanium dioxide on the carbon fiber support is not uniform
In addition, the coverage of titanium dioxide on the surface of carbon fibers reduces the active sites on the surface of carbon fibers, which inevitably reduces the activity and electrical conductivity of the catalyst.

Method used

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  • Nitrogen-doped carbon/titanium dioxide composite nanofibers carrier preparation method
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  • Nitrogen-doped carbon/titanium dioxide composite nanofibers carrier preparation method

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Embodiment 1

[0034] seefigure 1 , the present invention discloses a method for preparing a nitrogen-doped carbon / titania composite nanofiber carrier, the preparation method comprising:

[0035] Step S1. Preparation of tetrabutyl titanate solution: add tetrabutyl titanate to glacial acetic acid in a low-humidity environment, seal and stir to form a solution; wherein, the concentration of tetrabutyl titanate ranges from 0.01 to 0.5 g / ml, sealed and stirred for 15-60 minutes;

[0036] Step S2. Preparation of polyvinylpyrrolidone solution: dissolve polyvinylpyrrolidone in ethanol at room temperature to form a transparent viscous solution; wherein the concentration of polyvinylpyrrolidone ethanol solution is 10-20 wt.%, magnetically stirred for 6-8 hours, polyvinylpyrrolidone The average molecular weight ranges from 40,000 to 1,500,000 (K30 to K90), and the concentration of the prepared solution depends on the molecular weight of the selected polyvinylpyrrolidone. The higher the molecular weig...

Embodiment 2

[0041] A preparation method of nitrogen-doped carbon / titanium dioxide composite nanofiber carrier, the preparation method comprising:

[0042] Mix the glacial acetic acid solution of tetrabutyl titanate and the ethanol solution of polyvinylpyrrolidone in an appropriate proportion, prepare a composite fiber material by electrospinning technology, and then carbonize the material at high temperature in an ammonia atmosphere to obtain nitrogen-doped carbon / Titanium dioxide composite fibers.

Embodiment 3

[0044] A preparation method of nitrogen-doped carbon / titanium dioxide composite nanofiber carrier, said preparation method comprising the steps of:

[0045] (1) Preparation of tetrabutyl titanate solution: take 0.1 g of tetrabutyl titanate and add it to 2 ml of glacial acetic acid, prepare a solution with a volume mass fraction of 0.05 g / ml, and stir magnetically for 15 min;

[0046] (2) Preparation of polyvinylpyrrolidone solution: Dissolve 1g of polyvinylpyrrolidone K90 in 8ml of ethanol to prepare a solution with a volume mass fraction of 13.5wt.%, and magnetically stir for 6 hours to obtain a transparent solution;

[0047] (3) Preparation of the composite solution: mix the tetrabutyl titanate solution obtained in step (1) and the polyvinylpyrrolidone solution obtained in step (2), and magnetically stir for 20 minutes at room temperature to obtain a light yellow transparent viscous liquid;

[0048] (4) Preparation of composite nanofiber membrane: Add the composite solution ...

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Abstract

The invention reveals a nitrogen-doped carbon / titanium dioxide composite nanofibers carrier preparation method. The preparation method comprises the following steps: mixing an acetate acid gracial solution of tetrabutyl titanate and an ethanol solution of polyvinylpyrrolidone according to a proper proportion, preparing a composite fibrous material through a static spinning technology, and performing high-temperature carbonization on the fibrous material under ammonia gas atmosphere to obtain the nitrogen-doped carbon / titanium dioxide composite nanofibers. According to the invention, integrated preparation of titanium dioxide, carbon and the composite nanofibers is realized, and organic fusion of a carbon material and titanium dioxide is realized. The composite material has high specific surface and porosity, charge characteristics of the composite material can be adjusted through doping of the nitrogen atoms, corrosion resistant performance and conductivity of a catalyst carrier is increased, the catalyst carrier is excellent, material transmission is improved, and the method has good application prospect in a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells and relates to a method for preparing a fiber carrier, in particular to a method for preparing a nitrogen-doped carbon / titanium dioxide composite nanofiber carrier. Background technique [0002] Proton exchange membrane fuel cell is a new type of power generation device that directly converts chemical energy in fuel and oxidant into electrical energy. The preferred power supply for mobile electronic equipment and communication base stations. [0003] Catalyst is the key material of proton exchange membrane fuel cell, which plays a decisive role in battery performance, life and cost. At present, the commonly used platinum-based catalysts are carbon-supported Pt series, such as Pt / C, Pt-Ru / C and other catalysts. This series of catalysts uses the high specific surface area and good conductivity of carbon powder to improve the stability and catalytic activity of the catalyst and reduce the cost o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/18D01F8/10D01F1/10B01J27/24B01J35/06B01J32/00H01M4/90
CPCH01M4/9075D01F1/10D01F8/10D01F8/18B01J27/24B01J35/58Y02E60/50
Inventor 赵新生王敏李建伟魏永生
Owner XUZHOU NORMAL UNIVERSITY
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