Preparation method of silicotungstic acid/silicon dioxide polyvinyl alcohol proton exchange membrane

A proton exchange membrane and polyvinyl alcohol technology, applied in electrochemical generators, fuel cell parts, fuel cells, etc., can solve the problems of high swelling rate, low alcohol resistance, low methanol permeability, etc., and achieve swelling Low rate, enhanced conductivity, and reduced permeability

Inactive Publication Date: 2010-07-28
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

However, methanol is used as fuel in direct methanol fuel cells, so the proton exchange membrane in the battery is required not only to have high proton conductivity, but also to have very low methanol permeability, which makes the widely used perfluorosulfur Acid proton exchange membranes are no longer suitable
In order to obtain proton exchange membranes suitable for direct methanol fuel cells, it has been proposed to use silicotungstic acid doped polyvinyl alcohol composite membranes, but due to the uneven distribution of silicotungstic acid agglomeration in the membrane, the swelling of the membrane produced by this method High rate, low alcohol resistance

Method used

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  • Preparation method of silicotungstic acid/silicon dioxide polyvinyl alcohol proton exchange membrane
  • Preparation method of silicotungstic acid/silicon dioxide polyvinyl alcohol proton exchange membrane

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Embodiment

[0013] Dissolve 20 grams of polyvinyl alcohol in 150 milliliters of water to form a polymer solution A, heat the polymer solution A to 90°C, and stir at this temperature for 2 hours to obtain a solution B, then lower the temperature of the solution B to 60°C, Add 2.5g of silicon tetrachloride and 2.5g of sodium tungstate to solution B, stir at 60°C for 2 hours and then cool down to room temperature to form a uniform solution C; pour solution C on a polytetrafluoroethylene plate and Dry to form a film, the film thickness is controlled at 0.12mm, and the drying temperature is 50°C to obtain a silicotungstic acid / silica polyvinyl alcohol proton exchange membrane. Soak the membrane in deionized water for 12 hours before use. The electrical conductivity was measured by the two-electrode AC impedance method, and the swelling behavior of the film was characterized by the degree of swelling (SD). First, the dry film was cut into a rectangular diaphragm (with an area of ​​S d ), immer...

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Abstract

The invention relates to a preparation method of a silicotungstic acid / silicon dioxide polyvinyl alcohol proton exchange membrane, belonging to the field of battery electrolyte materials. The preparation method comprises the following steps of: firstly solving the polyvinyl alcohol in deionized water to prepare a macromolecular solution, adding silicon compounds and sodium tungstate to the prepared solution, heating and mixing to form a solution, pouring the solution on a polytetrafluoroethylene glass plate and drying to form a membrane, and then obtaining the required silicotungstic acid / silicon dioxide polyvinyl alcohol proton exchange membrane. The prepared proton exchange membrane has great proton conductivity and low methanol permeability and is convenient for the large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a silicotungstic acid / silica polyvinyl alcohol proton exchange membrane, belonging to the field of battery electrolyte materials. Background technique [0002] In a proton exchange membrane fuel cell, a proton exchange membrane is generally used as an electrolyte, and the currently widely used proton exchange membrane is mainly a perfluorosulfonic acid ion exchange membrane (Nafion membrane) produced by DuPont of the United States. This proton exchange membrane has good proton conductivity, but because it is a perfluorinated ion exchange membrane, the production cost is relatively expensive, especially the barrier property of this proton exchange membrane to liquid fuels such as methanol is poor, which is not conducive to the production of organic fuels. Battery. [0003] In order to solve this problem, some new proton exchange membranes have been developed, such as silicotungstic acid doped polyvinyl al...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L29/04C08K3/36C08K3/34H01M8/02H01M2/16H01M8/1018H01M8/1041
CPCY02E60/50Y02E60/12
Inventor 郭贵宝安胜利韩二丁
Owner INNER MONGOLIA UNIV OF SCI & TECH
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