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High-temperature fuel cell proton exchange membrane and preparation method and application thereof

A high-temperature fuel cell and proton exchange membrane technology, applied in fuel cells, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of battery performance degradation and aggravated PBI membrane degradation, and achieve high oxidation resistance and excellent oxidation stability , the effect of good proton conductivity

Active Publication Date: 2020-06-05
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

These free radicals generated will aggravate the degradation of the PBI film, resulting in a significant drop in battery performance

Method used

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  • High-temperature fuel cell proton exchange membrane and preparation method and application thereof
  • High-temperature fuel cell proton exchange membrane and preparation method and application thereof
  • High-temperature fuel cell proton exchange membrane and preparation method and application thereof

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Embodiment 1

[0030] The polybenzimidazole that present embodiment uses, its structural formula is:

[0031]

[0032] Wherein: n is the polymerization degree, and its value range is 50-500.

[0033] A high-temperature fuel cell proton exchange membrane and a preparation method thereof, comprising the following steps:

[0034] 1) Dissolve 0.52g of polybenzimidazole in 20mL of N-methylpyrrolidone (NMP), stir to dissolve at room temperature, and filter the impurities;

[0035] 2) Add cerium oxide, a free radical quencher, to the solution, stir at room temperature for 1 hour, and ultrasonically stir for 30 minutes to obtain a casting solution containing a free radical quencher, pour the casting solution into a glass mold, and dry at 80°C for 48 hours , to obtain polybenzimidazole / free radical quencher composite film; the amount of free radical quencher is 0.1% of the mass of polybenzimidazole;

[0036] 3) Disperse the nanoparticle MOFs material MIL101(Fe) with an organometallic framework s...

Embodiment 2

[0042] A high-temperature fuel cell proton exchange membrane and a preparation method thereof, comprising the following steps:

[0043] 1) Dissolve 2g of polybenzimidazole in 20mL of N,N-dimethylacetamide (DMAc), stir to dissolve at room temperature, and filter the impurities;

[0044] 2) Add the free radical quencher silicon dioxide to the solution, stir at room temperature for 0.5 hours, and ultrasonically stir for 30 minutes to obtain a casting solution containing a free radical quencher, pour the casting solution into a glass mold, and dry at 80°C for 24 hours , to obtain polybenzimidazole / free radical quencher composite film; the amount of free radical quencher is 0.9% of the mass of polybenzimidazole;

[0045] 3) Disperse MIL101(Cr), a nanoparticle MOFs material with an organometallic framework structure, in N,N-dimethylacetamide (DMAc) solvent, and stir ultrasonically for 30 minutes; and dissolve a certain amount of polybenzimidazole, nanoparticles The mass ratio with ...

Embodiment 3

[0051] A high-temperature fuel cell proton exchange membrane and a preparation method thereof, comprising the following steps:

[0052] 1) Dissolve 0.2 polybenzimidazole in 10 mL of N-methylpyrrolidone (NMP), stir to dissolve at room temperature, and filter impurities;

[0053] 2) Add manganese dioxide, a free radical quencher, to the solution, stir at room temperature for 1 hour, and ultrasonically stir for 30 minutes to obtain a casting solution containing a free radical quencher, pour the casting solution into a glass mold, and dry at 80°C for 248 hours , to obtain polybenzimidazole / free radical quencher composite film; the amount of free radical quencher is 0.1% of the mass of polybenzimidazole;

[0054] 3) Disperse the nanoparticle MOFs material MIL101(Fe) with an organometallic framework structure in N-methylpyrrolidone (NMP) solvent, and stir ultrasonically for 30 minutes; and dissolve a certain amount of polybenzimidazole, nanoparticles and polybenzo The mass ratio of...

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Abstract

The invention discloses a high-temperature fuel cell proton exchange membrane and a preparation method thereof. According to the proton exchange membrane, polybenzimidazole is used as a polymer skeleton, phosphoric acid is used as a proton conductor, a free radical quenching agent is doped in the membrane at the same time, protective layers containing the phosphoric acid adsorbent are compounded on the two sides of the membrane, so that the problem of conductivity loss caused by phosphoric acid loss of the polybenzimidazole / phosphoric acid high-temperature proton exchange membrane can be effectively solved, the oxidation resistance of the proton exchange membrane is improved, and the high-temperature proton exchange membrane with high oxidation resistance and high conductivity is prepared.The high-temperature proton exchange membrane provided by the invention has good proton conductivity and excellent antioxidant stability under a non-humidifying condition, and can effectively relievethe problem that the service life of a polymer skeleton is shortened due to free radical attack. The high-temperature proton exchange membrane provided by the invention can be applied to a high-temperature proton exchange membrane fuel cell and a direct alcohol fuel cell to be used as a proton exchange membrane.

Description

technical field [0001] The invention relates to the technical field of fuel cell materials, in particular to a high-temperature fuel cell proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, clean, and environment-friendly power generation device. It is an ideal power source for electric vehicles. application prospects. However, the widely used The representative perfluorinated sulfonic acid membrane fuel cell, but the proton conductivity of this type of proton exchange membrane is greatly affected by the water content and temperature in the membrane. Due to the limitations, it faces problems such as poor CO tolerance and difficult water and heat management of the system in practical application. Therefore, increasing the operating temperature of PEMFC to above 100°C can effectively overcome the above-mentioned problems of traditional Nafion-based PEMFC. This type of FC i...

Claims

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Application Information

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IPC IPC(8): H01M8/124
CPCH01M8/124H01M2300/0082Y02E60/50Y02P70/50
Inventor 郝金凯邵志刚张洪杰姜广
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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