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Polystyrene sulfonate film for low-temp. direct methanol fuel cell and preparation process thereof

A technology of polystyrene sulfonic acid membrane and methanol fuel cell, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of complex raw material preparation process, restrictions on large-scale application, and high production cost, and solve the problem of methanol permeation Difficulty, high proton conductivity, low production cost

Inactive Publication Date: 2004-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the perfluorosulfonic acid membrane, although it has better alcohol resistance, there are still defects such as complex preparation process of raw materials, high price, and high production cost of the membrane, which still restricts its application in direct methanol fuel. Large-scale applications in the field of batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of acyl sulfuric acid complex salt: mix acetic anhydride and 1,2-dichloroethane at a ratio of 1:2.0 and place in a test tube to prepare a solution, and pass nitrogen gas for protection. Freeze this solution, then add concentrated sulfuric acid under the protection of nitrogen, and cover and seal it for later use.

[0036]Dissolve 20 g of polystyrene in 200 ml of 1,2-dichloroethane to form a polymer solution and place it in a reflux device. Under the protection of nitrogen, the solution was heated to 60° C., 0.038 mol of prefabricated acetylsulfate complex salt solution was injected into the solution, and the sulfonation reaction was carried out under stirring and reflux at this temperature for 2 hours. Finally, 10 ml of 2-propanol was added to stop the reaction. The resulting solution was cooled, concentrated by vacuum evaporation, and the concentrated solution was added dropwise by injection into 1.5 L of distilled water to precipitate a polymer. The poly...

Embodiment 2

[0039] Preparation of acyl sulfate complex salt: Methyl propionate and 1,2-dichloroethane were mixed in a ratio of 1:2.5 and placed in a test tube to prepare a solution, which was protected by nitrogen gas. Freeze this solution, then add concentrated sulfuric acid under the protection of nitrogen, and cover and seal it for later use.

[0040] Dissolve 20 g of polystyrene in 200 ml of 1,2-dichloroethane to form a polymer solution and place it in a reflux device. Under the protection of nitrogen, the solution was heated to 85° C., 0.034 mol of prefabricated propionylsulfuric acid complex salt solution was injected into the solution, and the sulfonation reaction was carried out under stirring and reflux at this temperature for 3 hours. Finally, 10 ml of 2-propanol was added to stop the reaction. The resulting solution was cooled, concentrated by vacuum evaporation, and the concentrated solution was added dropwise by injection into 1.5 L of distilled water to precipitate a polyme...

Embodiment 3

[0043] Preparation of acylsulfate complex salt: mix ethyl formate and 1,2-dichloroethane at a ratio of 1:0.5 and place in a test tube to prepare a solution, and pass through argon for protection. Freeze this solution, then add concentrated sulfuric acid under the protection of argon, and cover and seal it for later use.

[0044] Dissolve 2 g of polystyrene in 200 ml of 1,2-dichloroethane to form a polymer solution and place it in a reflux device. Under the protection of argon, the solution was heated to 85° C., 0.029 mol of acylsulfuric acid complex salt solution was injected into the solution, and the sulfonation reaction was carried out under stirring and reflux at this temperature for 0.5 hours. Finally, 1 ml of 2-propanol was added to stop the reaction. The resulting solution was cooled, concentrated by vacuum evaporation, and the concentrated solution was added dropwise into 0.1 L of distilled water by injection to precipitate a polymer. The polymer precipitate was then...

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Abstract

The present invention uses industrial polystyrene as raw material, under the protection of inert gas uses complex of acidylating agent and concentrated sulfuric acid as sulfonating agent to make sulfonation, and utilizes dector-blade casting process or other membrane-forming process to prepare polystyrene sulfoacid membrane with low sulfonation degree. Said invention utilizes the control of sulfonation extent of polystyrene sulfoacid membrane and distribution of sulfoacid group to implement modification or polystyrene sulfoacid membrane, on the primise of that the protein conductivity of the membrane is not affected, the permeability of the methyl alcohol in the membrane is reduced, and the alcohol-resistance of membrane material is raised. It can be used as new type protein exchange membrane of two-temp. direct methyl alcohol fuel cell.

Description

technical field [0001] The present invention relates to electrochemical fuel cell technology, and more specifically refers to polystyrene sulfonic acid membranes for low-temperature direct methanol fuel cells. The invention also relates to its preparation method. Background technique [0002] Fuel cell is a new chemical power source with high performance and no pollution to the environment. Today, as environmental protection is paid more and more attention to, the research and development of fuel cells has attracted the attention of many developed countries. The governments of economically developed countries such as the United States, Japan, and Canada have formulated relevant policies to promote the development of fuel cells in their countries. Proton exchange membrane fuel cell is the fifth-generation advanced fuel cell. In addition to the general characteristics of fuel cells such as not being limited by the Carnot cycle and high energy conversion efficiency, it also h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L25/18H01M2/16
CPCY02E60/12Y02E60/10
Inventor 周震涛何燕
Owner SOUTH CHINA UNIV OF TECH
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