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Preparation method of phosphotungstic acid/polyvinyl alcohol composite proton exchange membrane

A proton exchange membrane, polyvinyl alcohol technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high methanol permeability, uneven distribution of nano-scale phosphotungstic acid particles, etc. Simple process, good alcohol resistance and excellent proton conductivity

Inactive Publication Date: 2013-01-02
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The key problem of the phosphotungstic acid-doped polyvinyl alcohol composite membrane prepared by this method is that the added nano-scale phosphotungstic acid particles are unevenly distributed in the polyvinyl alcohol matrix, and the methanol permeability is large.

Method used

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  • Preparation method of phosphotungstic acid/polyvinyl alcohol composite proton exchange membrane
  • Preparation method of phosphotungstic acid/polyvinyl alcohol composite proton exchange membrane
  • Preparation method of phosphotungstic acid/polyvinyl alcohol composite proton exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 14 grams of polyvinyl alcohol in 180 milliliters of water to form solution A. Heat solution A to 95°C and stir for 2 hours to obtain solution B. When the temperature drops to 70°C, add 3.89g concentrated phosphoric acid and 4.44g tungstic acid to solution B Sodium and 0.44g oxalic acid were stirred at a temperature of 85°C for 2 hours and then cooled to room temperature to form a uniform solution C; the solution C was poured on a polytetrafluoroethylene plate and dried to form a film, and the film thickness was controlled at 0.12 mm. Phosphotungstic acid-polyvinyl alcohol composite proton exchange membrane was obtained after vacuum drying at 90°C for 7 hours.

[0032] Soak the membrane in deionized water for 12 hours before use. The conductivity was measured by the two-electrode AC impedance method, and the swelling degree ( SD ) to characterize the swelling behavior of the membrane, first cut the dry membrane into a rectangular membrane with a size of a...

Embodiment 2

[0036] Dissolve 7 grams of polyvinyl alcohol in 130 milliliters of water to form solution A. Heat solution A to 85°C and stir for 1.5 hours to obtain solution B. When the temperature drops to 65°C, add 1.13g concentrated phosphoric acid and 1.46g tungstic acid to solution B Sodium and 0.29g oxalic acid were stirred at a temperature of 80°C for 2 hours and then cooled to room temperature to form a uniform solution C; the solution C was poured on a polytetrafluoroethylene plate and dried to form a film, the film thickness was controlled at 0.1 mm, Phosphotungstic acid-polyvinyl alcohol composite proton exchange membrane was obtained after vacuum drying at 80°C for 6 hours.

Embodiment 3

[0038] Dissolve 10g of polyvinyl alcohol in 170ml of water to form solution A, heat solution A to 90°C, stir for 2 hours to obtain solution B, lower the temperature to 60°C, add 1.67g of concentrated phosphoric acid and 2.43g of tungstic acid to solution B Sodium and 0.43g oxalic acid were stirred at a temperature of 90°C for 2 hours and then cooled to room temperature to form a uniform solution C; the solution C was poured on a polytetrafluoroethylene plate and dried to form a film, the film thickness was controlled at 0.15 mm, Phosphotungstic acid-polyvinyl alcohol composite proton exchange membrane was obtained after vacuum drying at 85°C for 7 hours.

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Abstract

The invention discloses a preparation method of a phosphotungstic acid / polyvinyl alcohol composite proton exchange membrane, belonging to the field of fuel-cell electrolyte materials. The method comprises the following steps: firstly, dissolving polyvinyl alcohol in de-ionized water to prepare a polymer solution; adding phosphoric acid and sodium tungstate, heating and stirring to form a solution; pouring the solution on a polytetrafluoroethylene glass plate; and drying to form a membrane, so as to obtain a phosphotungstic acid / polyvinyl alcohol composite proton exchange membrane. The composite proton exchange membrane prepared according to the preparation method provided by invention not only has the characteristics of excellent proton electrical conductivity, low methanol permeability and low cost, but also can be conveniently produced in a large scale.

Description

[0001] technical field [0002] The invention relates to a preparation method of a phosphotungstic acid-polyvinyl alcohol composite proton exchange membrane, belonging to the field of battery electrolyte materials. Background technique [0003] Proton exchange membrane fuel cell (PEMFC) is considered as one of the most promising clean energy sources because of its high energy efficiency and no pollution. [0004] Direct methanol fuel cell (DMFC), as one of the most promising fuel cells in this class, has attracted more and more attention for its advantages. [0005] Direct methanol fuel cells directly convert liquid methanol fuel and oxidant (O 2 ) of chemical energy into electrical energy, is a new type of power generation device. [0006] Since the methanol fuel cell uses methanol as fuel, it solves the storage and transportation problems when using hydrogen as fuel in the past. It is small in size, light in weight, safe and convenient to use, enough to replace traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D69/12B01D67/00H01M8/10
CPCY02E60/521Y02E60/523Y02E60/522Y02E60/50
Inventor 郭贵宝刘书题安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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