Method for improving chemical stability of proton exchange membrane

A proton exchange membrane, chemical stability technology, applied in electrical components, battery electrodes, circuits, etc., can solve many problems and achieve the effect of reducing membrane degradation, simple method and easy operation

Inactive Publication Date: 2012-05-30
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

However, the first type of method has not been studied much, and it is of great significance to improve the chemical stability of the film from the perspective of microscopic morphology modification.

Method used

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  • Method for improving chemical stability of proton exchange membrane
  • Method for improving chemical stability of proton exchange membrane
  • Method for improving chemical stability of proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare 1L 0.05mmol / L Zr(NO3)4 solution, immerse 10g perfluorosulfonic acid membrane (Nafion212) in the solution, take out the membrane after 24h to obtain a trace amount of Zr 4+ Typed Nafion212 (referred to as Zr 4+ -Nafion212), Zr 4+ The number of moles is 20% of the number of moles of sulfonic acid groups in the perfluorosulfonic acid proton exchange membrane. The membrane-electrode three-in-one assembly was hot-pressed at 140°C, activated after the battery was assembled, and then the chemical stability of the membrane was investigated in the open-circuit accelerated test. The operating conditions were: the battery temperature was 80°C, the humidification temperature was 64°C, and the relative humidity Control at 50%, the hydrogen and oxygen intake flow rate is 40ml / min, the intake pressure is 0.2MPa, and it runs continuously for 24 hours.

[0019] The experimental results show that: Zr 4+ -The OCV rate of Nafion212 is significantly lower than that of the compara...

Embodiment 2

[0021] Prepare 1L 0.05mmol / L Mg(NO 3 ) 2 solution, immerse 10g perfluorosulfonic acid membrane (Nafion212) in the solution, take out the membrane after 24h to obtain a trace amount of Mg 2+ Typed Nafion212 (referred to as Mg 2+ -Nafion212), Mg 2+ The number of moles is 10% of the number of moles of sulfonic acid groups in the perfluorosulfonic acid proton exchange membrane. The membrane-electrode three-in-one assembly was hot-pressed at 140°C, activated after the battery was assembled, and then the chemical stability of the membrane was investigated in the open-circuit accelerated test. The operating conditions were: the battery temperature was 80°C, the humidification temperature was 64°C, and the relative humidity Control at 50%, the hydrogen and oxygen intake flow rate is 40ml / min, the intake pressure is 0.2MPa, and it runs continuously for 24h.

Embodiment 3

[0023] Prepare 1L 0.05mmol / L Ca(NO 3 ) 2 Solution, immerse 10g perfluorosulfonic acid membrane (Nafion212) in the solution, take out the membrane after 24h to obtain trace Ca 2+ Typed Nafion212 (referred to as Ca 2+ -Nafion212), Ca 2+ The number of moles is 10% of the number of moles of sulfonic acid groups in the perfluorosulfonic acid proton exchange membrane. The membrane-electrode three-in-one assembly was hot-pressed at 140°C, activated after the battery was assembled, and then the chemical stability of the membrane was investigated in the open-circuit accelerated test. The operating conditions were: the battery temperature was 80°C, the humidification temperature was 64°C, and the relative humidity Control at 50%, the hydrogen and oxygen intake flow rate is 40ml / min, the intake pressure is 0.2MPa, and it runs continuously for 24h.

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Abstract

The invention provides a method for improving chemical stability of a proton exchange membrane. According to the invention, a perfluorosulfonic acid proton exchange membrane is immersed in a solution containing one or more than two metal ions selected from the group consisting of Zr<4+>, Ca<2+>, Mg<2+> and Al<3+>, and introduction of one metal ion or more than two metal ions selected from the group consisting of Zr<4+>, Ca<2+>, Mg<2+> and Al<3+> into the perfluorosulfonic acid proton exchange membrane is realized through ion exchange. The method provided in the invention improves resistance of the proton exchange membrane to chemical degradation by modifying micro-morphology of ion clusters of the membrane.

Description

technical field [0001] The invention relates to a method for improving the chemical stability of a proton exchange membrane used in a fuel cell, in particular to a method for improving the chemical degradation resistance of the membrane by modifying the microscopic appearance of ion clusters of the proton exchange membrane. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an energy conversion device that directly converts chemical energy stored in fuel and oxidant into electrical energy through electrochemical reaction. It has high energy conversion efficiency, low temperature start-up, high specific power and specific energy, Environmentally friendly and other characteristics, it is expected to become one of the alternative power sources for stationary power stations, vehicle power sources and mobile power sources, and has broad application prospects. In the future era of low-carbon economy, PEMFC, as an ideal vehicle power source, will receive mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 张华民肖少华李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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