Method for preparing phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane

A polyvinylidene fluoride and proton exchange membrane technology, which is used in fuel cell parts, fuel cells, electrical components, etc., can solve problems such as uneven distribution of agglomeration and loss of heteropolyacids, and avoid agglomeration, loss, and swelling. The effect of reducing the degree of alcohol resistance and good resistance to alcohol

Inactive Publication Date: 2014-12-10
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because heteropolyacids are easily soluble in water, under the operating conditions of DMFC, heteropolyacids are easily lost with the water generated by the electrodes, and the agglomeration is unevenly distributed in the membrane.

Method used

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  • Method for preparing phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane
  • Method for preparing phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 20g of polyvinylidene fluoride in 380g of dimethyl sulfoxide to form solution A; heat solution A to 60°C, stir for 2 hours to obtain solution B, cast solution B on a clean glass plate and dry it in vacuum at 70°C to obtain Film; put the film in 6mol / L sodium hydroxide solution, treat it in an oil bath at 60°C for 8 hours, take it out, wash it repeatedly with water until neutral, and dry it at 105°C to form a film; dissolve 10g of dry film in A mixture of 190g dimethyl sulfoxide and 21.6mL water forms a solution C; heat the solution C to 80°C, stir for 2 hours, then drop the temperature to 70°C, add 2 g of sodium tungstate and 1.25g of concentrated phosphoric acid, and stir for 2 Cool down after 1 hour, heat up the vacuum oil bath to 130°C, stir for 1.5 hours until all the water in the solution evaporates, and then cool down to room temperature to form solution D; pour solution D on a polytetrafluoroethylene plate, and vacuum dry at 90°C to obtain Phosphotungsti...

Embodiment 2

[0034] Dissolve 15g of polyvinylidene fluoride in 240g of dimethyl sulfoxide to form solution A, heat solution A to 50°C, stir for 2 hours to obtain solution B, cast solution B on a clean glass plate and dry it in vacuum at 60°C film; put the film in 7mol / L sodium hydroxide solution, treat it in an oil bath at 70°C for 9 hours, take it out, wash it repeatedly with water until neutral, and dry it at 110°C to form a film; dissolve 8g of dry film in A mixture of 128g dimethyl sulfoxide and 13mL water forms solution C; heat solution C to 85°C, stir for 2 hours, then lower the temperature to 60°C, add 1.25g sodium tungstate and 0.88g concentrated phosphoric acid, stir for 2 hours After cooling down, the vacuum oil bath was heated to 110°C, and stirred for 1 hour until all the water in the solution evaporated, and then cooled to room temperature to form solution D; pour solution D on a polytetrafluoroethylene plate, and vacuum dry at 95°C to obtain phosphorus Tungstic acid-polyvinyl...

Embodiment 3

[0036] Dissolve 10g of polyvinylidene fluoride in 180g of dimethyl sulfoxide to form solution A, heat solution A to 60°C, stir for 2 hours to obtain solution B, cast solution B on a clean glass plate and dry it in vacuum at 80°C Film; put the film in 7mol / L sodium hydroxide solution, treat it in an oil bath at 80°C for 10 hours, take it out, wash it repeatedly with water until neutral, and dry it at 115°C to form a film; dissolve 6g of dry film in A mixture of 108g dimethyl sulfoxide and 10mL water forms solution C; heat solution C to 90°C, stir for 2.5 hours, then lower the temperature to 65°C, add 0.71g sodium tungstate and 0.41g concentrated phosphoric acid, stir for 2 hours After cooling down, the vacuum oil bath was heated to 120°C, and stirred for 2 hours until all the water in the solution evaporated, and then cooled to room temperature to form solution D; pour solution D on a polytetrafluoroethylene plate, and vacuum dry at 95°C to obtain phosphorus Tungstic acid-polyv...

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Abstract

The invention discloses a method for preparing a phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane and belongs to the field of battery electrolyte materials. Firstly polyvinylidene fluoride is dissolved in a dimethyl sulfoxide to obtain a macromolecular solution, the solution is coated to form a membrane, the membrane is processed in an alkaline liquor and then cleanly washed by deionized water to obtain a modified membrane, the modified membrane is dissolved in a mixed liquor of the dimethyl sulfoxide and water, a strong phosphoric acid and sodium tungstate are added to obtain a mixture, the mixture is heated and stirred to obtain a solution, and the solution is poured on a polytetrafluoroethylene glass pane and dried to obtain the phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane. The prepared composite proton exchange membrane is good in proton conduction, low in methanol permeability, swelling degree and cost and convenient to massively produce.

Description

technical field [0001] The invention relates to a preparation method of a phosphotungstic acid-polyvinylidene fluoride composite proton exchange membrane, belonging to the field of battery electrolyte materials. Background technique [0002] As a new type of clean and renewable energy, direct methanol fuel cell (DMFC) can provide more than 10 times higher energy than secondary batteries due to its simple structure, low operating temperature and pressure requirements, and high energy density (about 6000Wh / Kg). electricity, and has the advantage of not requiring a reformer, and has broad application prospects in the fields of automobiles and portable electronic devices. At present, it has received more and more attention, and it is the green energy most likely to realize commercial application. [0003] As the core material of direct methanol fuel cells, the proton exchange membrane acts as a selective conductor from the cathode to the anode, while it blocks fuel and oxidant....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08J7/00C08L27/16C08K3/32H01M2/16H01M8/02H01M8/1069
CPCY02E60/50
Inventor 郭贵宝班辉安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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