Sulfonation post-treatment method for organic-inorganic composite electrolyte membranes

A technology of inorganic compounding and processing methods, applied in the direction of electrochemical generators, fuel cell parts, circuits, etc., can solve problems such as the decline of proton conductivity, achieve the effect of low cost, simple equipment requirements, and easy implementation

Active Publication Date: 2011-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention effectively solves the problem that the proton conductivity of the organic-inorganic composite membrane decreases by modifying the surface of the inorganic particles by sulfonating the organic-inorganic composite membrane

Method used

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  • Sulfonation post-treatment method for organic-inorganic composite electrolyte membranes

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Effect test

Embodiment 1

[0030] Take a sheet with an area of ​​35×35(mm 2 ) Nafion / SiO 2 The composite film was vacuum-dried at 80° C. for 6 hours. Take out the above-mentioned dried composite film and transfer to concentrated sulfuric acid (mass concentration 98%) at 130° C. to cook for a certain period of time (4 hours, 10 hours or 16 hours). After completion, the composite membrane was taken out and washed in deionized water until the washing solution was neutral. The sulfonated organic-inorganic composite membrane was obtained after drying in a vacuum oven at 80°C for 12 hours. After different sulfonation time treatments, the proton conductivity of the obtained sulfonated organic-inorganic composite membranes is as follows: figure 1 shown. The value at the intersection of the impedance curve and the horizontal axis in the figure can represent the membrane resistance, and it can be seen that the resistance of the composite membrane decreases after sulfonation. This shows that after sulfonation...

Embodiment 2

[0032] Take a sheet with an area of ​​100×270(mm 2 ) Nafion / SiO 2 The composite film was vacuum-dried at 80° C. for 6 hours. The above-mentioned dried composite membrane was taken out and transferred to chlorosulfonic acid (analytical pure) at 80° C. to cook for 10 hours. After completion, the composite membrane was taken out and washed in deionized water until the washing solution was neutral. The sulfonated organic-inorganic composite membrane was obtained after drying in a vacuum oven at 80°C for 12 hours.

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Abstract

The invention relates to a sulfonation post-treatment method for organic-inorganic composite electrolyte membranes. The invention can effectively solve the conductivity drop problem of the conventional proton exchange membrane doped with inorganic particles. The sulfonated organic-inorganic composite membrane prepared by the post-treatment method can be used in the conventional and high-temperature (80 to 120DEG C) proton exchange membrane fuel cells and has high performance under a high-temperature and low-humidification condition, and the performance of the sulfonated organic-inorganic composite membrane is almost retained after the proton exchange membrane fuel cells runs for a long time. The sulfonated organic-inorganic composite membrane prepared by the method can be applied to the high-temperature proton exchange membrane fuel cells and direct alcohol fuel cells as a proton transmission medium.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell electrolyte composite membrane, in particular to a method for improving the proton conductivity of the proton exchange membrane fuel cell organic-inorganic composite membrane. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a power generation device that can directly convert the chemical energy of fuel and oxidant into electrical energy. The proton exchange membrane is the core material of the entire PEMFC, which plays the role of guiding protons and blocking reaction gases. Traditional perfluorosulfonic acid membrane (such as DuPont's Nafion membrane series) electrolyte, because the proton conductivity of this type of membrane material has a strong dependence on the water content of the membrane, its normal working temperature is generally maintained at around 60-80°C . The temperature is too low, the electrochemical reaction rate is low, and the battery powe...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/14H01M8/02H01M2/16H01M8/1088H01M8/124
CPCY02E60/50Y02E60/12
Inventor李晓锦柯长春屈树国邵志刚衣宝廉
OwnerDALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI