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Polysiloxane- and polyphosphonic acid-doped chitosan high-temperature proton exchange film and preparation method thereof

A proton exchange membrane, polysiloxane technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, solid electrolyte fuel cells, etc. Time and other issues, to achieve the effect of low cost, avoiding the decline of electrical conductivity, and alleviating the problem of hydrolysis

Inactive Publication Date: 2015-04-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrical conductivity and mechanical properties of the film are lower than those of the commercialized Nafion film, and the film making process takes a long time, so it is not suitable for industrial production

Method used

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  • Polysiloxane- and polyphosphonic acid-doped chitosan high-temperature proton exchange film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A polysiloxane polyphosphonic acid doped chitosan high-temperature proton exchange membrane, which is prepared according to the following steps:

[0029] At room temperature, dissolve 0.1g chitosan powder in 20mL, 1% (v / v) acetic acid aqueous solution to configure 0.5wt% chitosan acetic acid aqueous solution, and fully stir to dissolve it evenly; weigh 0.9855 g2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and 0.09968g aminotrimethylene phosphonic acid (silicon, phosphorus molar ratio is 4.0:1.0), and they were dissolved in 10mL deionized water to prepare Siloxane solution and organic polyphosphonic acid solution; add the prepared siloxane solution to the above-mentioned chitosan solution at room temperature, and continue to stir for 2 hours; put the obtained mixed solution into an ice-water mixing bath, slowly drop Add organic polyphosphonic acid solution and continue stirring for 12 hours to obtain a sol; pour the sol into a polytetrafluoroethylene mold, dry it in vacuu...

Embodiment 2

[0031] A polysiloxane polyphosphonic acid doped chitosan high-temperature proton exchange membrane, which is prepared according to the following steps:

[0032] At room temperature, dissolve 0.4g chitosan powder in 20mL, 2% (v / v) acetic acid aqueous solution to configure 2wt% chitosan acetic acid aqueous solution, and fully stir to make it dissolve evenly; weigh 0.9454g gamma- (2,3-Glycidoxypropoxy)propyltrimethoxysilane and 0.2060g hydroxyethylidene diphosphonic acid (silicon, phosphorus molar ratio is 4.0:2.0), and dissolved in 10mL deionized water respectively into a siloxane solution and an organic polyphosphonic acid solution; add the prepared siloxane solution to the above-mentioned chitosan solution at room temperature, and continue to stir for 3 hours; put the obtained mixed solution into an ice-water mixing bath, slowly Add organic polyphosphonic acid solution dropwise, and keep stirring for 15 hours to obtain a sol; pour the sol into a polytetrafluoroethylene mold, d...

Embodiment 3

[0034] A polysiloxane polyphosphonic acid doped chitosan high-temperature proton exchange membrane, which is prepared according to the following steps:

[0035]At room temperature, 0.6g chitosan powder was dissolved in 20mL, 3% (v / v) acetic acid aqueous solution to configure 3wt% chitosan acetic acid aqueous solution, and fully stirred to make it dissolve evenly; weighed 0.9855g2- (3,4-epoxycyclohexyl)ethyltrimethoxysilane and 0.2991g aminotrimethylene phosphonic acid (silicon, phosphorus molar ratio is 4.0:3.0), and they were dissolved in 20mL deionized water to prepare silicon oxide alkane solution and organic polyphosphonic acid solution; add the prepared siloxane solution to the above-mentioned chitosan solution at room temperature, and continue to stir for 4 hours; put the obtained mixed solution into an ice-water mixing bath, and slowly add organic Polyphosphonic acid solution was continuously stirred for 18 hours to obtain a sol; the sol was poured into a polytetrafluor...

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Abstract

The invention relates to a polysiloxane- and polyphosphonic acid-doped chitosan high-temperature proton exchange film and a preparation method thereof. The polysiloxane- and polyphosphonic acid-doped chitosan high-temperature proton exchange film is the product obtained through the following steps: (1) preparing chitosan solution; (2) preparing organic polyphosphonic acid solution and polysiloxane solution; (3) adding the polysiloxane solution in the chitosan solution at room temperature, and adequately and uniformly stirring to obtain the mixed solution; (4) placing the mixed solution in an ice-water mixed bath, slowly dropwise adding the organic polyphosphonic acid solution, after that, continuously stirring to obtain a sol; and (5) pouring the sol in a polytetrafluoroethylene die disc, drying and then carrying out heat treatment, cooling and then peeling to obtain the polysiloxane- and polyphosphonic acid-doped chitosan high-temperature proton exchange film. The preparation method disclosed by the invention is simple in preparation process and moderate in reaction conditions; moreover, the prepared high-temperature proton exchange film still has high proton conductivity under a high-temperature and low-humidity condition and even a water-free condition.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a polysiloxane polyphosphonic acid-doped chitosan high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a type of fuel cell system that uses a proton exchange membrane as an electrolyte. This type of fuel cell is also often referred to as a solid polymer fuel cell. The proton exchange membrane is the core component of the fuel cell, which directly affects the performance and life of the battery. Proton exchange membranes for PEMFC need to have high H + It also needs to have good proton conductivity and certain mechanical strength under high temperature and low humidity working conditions. [0003] At present, the commonly used proton exchange membrane materials include polymers such as perfluorosulfonic acid polymers, polyaryletherketones, polyetheretherketones, chitosan and pol...

Claims

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Application Information

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IPC IPC(8): H01M8/10H01M8/02H01M8/0239H01M8/106
CPCH01M8/10H01M8/1018Y02E60/50Y02P70/50
Inventor 高山俊尹珊珊沈春晖李伟李慧琳
Owner WUHAN UNIV OF TECH
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