Nafion/sulfonated SiO2 molecular sieve composite proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and molecular sieve, applied in the field of proton exchange membrane, can solve problems such as reducing proton conductivity, and achieve the effects of simple method, short preparation period and mild conditions

Inactive Publication Date: 2011-01-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these nano-inorganic substances can reduce the methanol permeability, they also reduce the proton conductivity of the membrane (Jung D H, Cho S Y, Peck D H, et al.Performance evaluation of a Nation / silicon oxide hybrid membrane for direct methanol fuel cell [J]. Power Sources, 2002, 106(1-2): 173-177)

Method used

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  • Nafion/sulfonated SiO2 molecular sieve composite proton exchange membrane and preparation method thereof
  • Nafion/sulfonated SiO2 molecular sieve composite proton exchange membrane and preparation method thereof
  • Nafion/sulfonated SiO2 molecular sieve composite proton exchange membrane and preparation method thereof

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Embodiment 1

[0026] Take by weighing 50g 5wt% Nafion alcohol solution and 47.5g DMF and mix and carry out vacuum distillation, remove the alcohols of low boiling point, obtain Nafion-DMF mixed solution; 2 Molecular sieves were added to 15ml of 0.5M sulfuric acid solution, stirred for 30min, and then the whole solution was dried in an oven at 100°C for 24h to obtain sulfonated SiO 2 Molecular sieve powder;

[0027] According to sulfonated SiO 2 The content of molecular sieve is 1%, weigh 0.0063g sulfonated SiO 2 Pour the molecular sieve into the Erlenmeyer flask, then pour 6g DMF, ultrasonically disperse for 30 minutes, then add 15g of the above-mentioned Nafion-DMF mixed solution into the Erlenmeyer flask, continue ultrasonically dispersing for 30 minutes, and obtain a milky white cast film after standing for defoaming liquid; the casting solution is cast into a clean and flat glass petri dish, heat-treated in an oven at 60°C for 2 hours, at 80°C for 2 hours, and at 100°C for 12 hours to...

Embodiment 2

[0029] Take by weighing 50g 5wt% Nafion alcohol solution and 47.5g DMF and mix and carry out vacuum distillation, remove the alcohols of low boiling point, obtain Nafion-DMF mixed solution; 2 Molecular sieves were added to 10ml of 0.5M sulfuric acid solution, stirred for 45min, and then the whole solution was dried in an oven at 100°C for 24h to obtain sulfonated SiO 2 Molecular sieve powder;

[0030] According to sulfonated SiO 2 The content of molecular sieve is 3%, weigh 0.0189g sulfonated SiO 2 Pour the molecular sieve into the Erlenmeyer flask, then pour 6g of DMF, ultrasonically disperse for 45 minutes, then add 15g of the above-mentioned Nafion-DMF mixed solution into the Erlenmeyer flask, continue ultrasonically dispersing for 30 minutes, and obtain a milky white cast film after standing for defoaming liquid; the casting solution is cast into a clean and flat glass petri dish, heat-treated in an oven at 60°C for 2 hours, at 80°C for 2 hours, and at 100°C for 12 hours...

Embodiment 3

[0032] Take by weighing 50g 5wt% Nafon alcohol solution and 45g DMF and mix and carry out vacuum distillation, remove the alcohols of low boiling point, obtain Nafion-DMF mixed solution; 2 Molecular sieves were added to 15ml of 0.5M sulfuric acid solution, stirred for 60min, and then the whole solution was dried in an oven at 100°C for 24h to obtain sulfonated SiO 2 Molecular sieve powder;

[0033] According to sulfonated SiO 2 The content of molecular sieve is 5%, weigh 0.0316g sulfonated SiO 2 Pour the molecular sieve into the Erlenmeyer flask, then pour 4g DMF, ultrasonically disperse for 30 minutes, then add 12g of the above-mentioned Nafion-DMF mixed solution into the Erlenmeyer flask, continue ultrasonically dispersing for 45 minutes, and obtain a milky white cast film after standing for defoaming liquid; the casting solution is cast into a clean and flat glass petri dish, heat-treated in an oven at 60°C for 2 hours, at 80°C for 2 hours, and at 100°C for 12 hours to ob...

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Abstract

The invention relates to a Nafion / sulfonated SiO2 molecular sieve composite proton exchange membrane and a preparation method thereof. the proton exchange membrane takes Nafion alcoholic solution and a sulfonated SiO2 molecular sieve as main raw materials. The preparation method comprises the following steps: distilling the raw materials for removing low-boiling alcohol by a solvent replacement method under reduced pressure to obtain Nafion-DMF solution; proportionally mixing the sulfonated SiO2 molecular sieve with the Nafion-DMF solution and evenly dispersing the obtained mixed solution; keeping standing and defoaming to obtain milky casting solution; and membrane-casting in a clear and flat glass culture ware to obtain the Nafion / sulfonated SiO2 molecular sieve composite membrane after thermal treatment. The thickness of the composite membrane is 45-55mum, wherein, the content of the sulfonated SiO2 molecular sieve is 1-15%, preferably 1-10%; and the composite membrane has the characteristics of low methanol transmittance and high proton conductivity.

Description

technical field [0001] The present invention relates to a kind of proton exchange membrane, relate to a kind of Nafion / sulfonated SiO more specifically 2 Molecular sieve composite proton exchange membrane. technical background [0002] A fuel cell (Fuel Cell) is a new type of energy conversion device that can directly convert chemical energy into electrical energy. Due to its high efficiency, environmental friendliness, quietness, and high reliability, fuel cells are considered to be the preferred clean and efficient power generation technology in the 21st century. Direct methanol fuel cell (DMFC) is a new type of proton exchange membrane fuel cell (PEMFC) developed in recent years. It uses methanol directly as fuel and oxygen or air as oxidant, and has broad application prospects. [0003] The proton exchange membrane is one of the most critical components of PEMFC and DMFC, which provides guarantee for the smooth progress of the electrochemical reaction of the battery. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16C08L27/12C08K9/02C08K3/36H01M8/1069H01M8/1088
CPCY02E60/50
Inventor 朱红卢真
Owner BEIJING UNIV OF CHEM TECH
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