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Composite type proteon exchange film for high-temp. direct methanol fue cell and preparation process thereof

A methanol fuel cell and proton exchange membrane technology, applied in fuel cells, battery electrodes, lead-acid battery electrodes, etc., can solve the problems of high price, high methanol permeability, poor proton conductivity at high temperature, etc., and achieve low membrane cost, The effect of simple preparation process

Inactive Publication Date: 2002-12-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing Nafion membrane used in direct methanol fuel cells not only has the problem of high price, but also has poor proton conductivity at high temperature, high permeability of methanol to the membrane, and these two shortcomings also decrease with the increase of temperature. Increase and other problems, not suitable for high temperature direct methanol fuel cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Silica powder with a particle size of 7.5 nm was doped with phosphotungstic acid equivalent to 30% by weight of the silica powder, and mixed uniformly. Weigh 100 parts by weight of polyvinylidene fluoride and 60 parts by weight of silica doped with phosphotungstic acid, dissolve the polyvinylidene fluoride in N-methylpyrrolidone to form a polymer solution, and add 30% phosphotungsten to it. Acidic silica, shaken uniformly with ultrasonic waves for 20 minutes; spread the mixed solution on the surface of a petri dish, heat it at 80 °C for 20 minutes, dry it at room temperature for 15 hours to form a film, and finally heat the film at 160 °C 10 minutes is sufficient, and the obtained film is sample 1. The membranes were soaked in deionized water at 80°C for 3 hours before use. A comparison of the high temperature methanol permeation of sample 1 with Nafion membranes is shown in Table 1.

Embodiment 2

[0032] The silica powder with a particle size of 7.5 nm was mixed with silicotungstic acid equivalent to 45% by weight of the silica powder, and mixed uniformly. Weigh 100 parts by weight of polyvinylidene fluoride and 60 parts by weight of silica doped with phosphotungstic acid, dissolve polyvinylidene fluoride in N-methylpyrrolidone to form a polymer solution, and add 45% phosphotungsten to it Acidic silica, shaken with ultrasonic waves for 20 minutes; spread the mixed solution on the surface of a petri dish, heat it at 90°C for 5 minutes, dry it at room temperature for 15 hours to form a film, and finally press the film at 160°C for 10 minutes That's it. The membranes were soaked in deionized water at 80°C for 3 hours before use.

Embodiment 3

[0034] Phosphotungstic acid equivalent to 30% by weight of the silica powder was mixed into the silica powder with a particle size of 12 nm, and the mixture was uniformly mixed. Weigh 100 parts by weight of polyvinylidene fluoride and 70 parts by weight of silica powder doped with phosphotungstic acid, dissolve polyvinylidene fluoride in N-methylpyrrolidone to form a polymer solution, and add 30% phosphotungsten to it The acid silica was uniformly shaken with ultrasonic waves for 10 minutes; the mixed solution was spread on the surface of the petri dish, heated at 25 °C for 40 minutes, dried at room temperature for 24 hours to form a film, and finally the film was hot-pressed at 170 °C for 3 minutes. The membranes were soaked in deionized water at 80°C for 3 hours before use.

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Abstract

This invention relates to electric chemical fuel battery technology, the raw material of the compound proton exchange film with millimicron micropore structure used in the high temperature direct, carbinol fuel battery is processed with PVDF and PVA added by mixed inorganic multi-element acid millimicron ceramic powder by doctoblade hot pressure, brie-coated, rolling process or imprenated methods. The carbinol permeability at 80-180 deg.c in smaller than Nafion film with good performance of cardinal resistance, available in the operation at high temperature (above 100deg.c) of direct carbinolfuel battery proton exchange film.

Description

technical field [0001] The present invention relates to electrochemical fuel cell technology, more particularly to a proton exchange membrane for high temperature direct methanol fuel cell, and also relates to a method for preparing the membrane. Background technique [0002] In today's world, the exhaust emission of fuel vehicles has become one of the main sources of environmental pollution. The development of electric vehicles with electric energy as the power source is an effective means to reduce the exhaust emissions of fuel vehicles and reduce the degree of environmental pollution. The fuel cell with "zero emission" feature is the most promising new energy source to replace the existing fuel engine as a vehicle power source. Among the various types of fuel cells, in addition to the general advantages of other fuel cells, direct methanol fuel cells (DMFC) also have the advantages of abundant and readily available fuel sources, low price, easy transportation and storage,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/14H01M4/88H01M4/94H01M8/1046H01M8/1048H01M8/1069
CPCY02E60/10Y02E60/50
Inventor 周震涛何燕
Owner SOUTH CHINA UNIV OF TECH
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