Cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and preparation method thereof

A polybenzimidazole and proton exchange membrane technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of battery performance degradation and aggravated PBI membrane degradation, so as to reduce swelling problems and improve oxidation resistance , Improve the effect of mechanical strength

Active Publication Date: 2017-01-25
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These free radicals generated will aggravate the degradation of th

Method used

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  • Cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and preparation method thereof
  • Cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and preparation method thereof

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Embodiment 1

[0034] A method for preparing a cross-linked polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with high oxidation resistance, comprising the following steps:

[0035] (1) Dissolve 5 g PBI in 500 g NMP, stir for 12 hours, and filter twice to remove impurities; then add 5 g CeO 2 , ultrasonic for 30 minutes, to obtain the casting liquid;

[0036] (2) Pour the casting liquid obtained in step (1) into the cast film plate, and then place it in a constant temperature and humidity box with a humidity of 55% (humidity) and a temperature of 80°C for 6 hours to carry out gas phase transformation, and then immerse in NMP Take it out after 1 hour in the aqueous solution, and dry it in vacuum at 100°C for 10 hours to obtain a porous inner layer with a thickness of 60 microns; wherein, the NMP aqueous solution is obtained by mixing NMP and deionized water at a volume ratio of 1:1;

[0037] (3) Dissolve 0.5 g PBI in 10 g NMP, stir for 12 hours, and filter twice to...

Embodiment 2

[0044] A method for preparing a cross-linked polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with high oxidation resistance, comprising the following steps:

[0045] (1) Dissolve 3 g PBI in 100 g NMP, stir for 12 hours, and filter twice to remove impurities; then add 0.5 g MnO 2 , ultrasonic for 30 minutes, to obtain the casting liquid;

[0046] (2) Pour the casting liquid obtained in step (1) into the casting film plate, and then place it in a constant temperature and humidity box with a humidity of 65% (humidity) and a temperature of 70°C for 8 hours to carry out gas phase transformation, and then immerse in NMP Take it out after 2 hours in the aqueous solution, and dry it in vacuum at 100°C for 10 hours to obtain a porous inner layer with a thickness of 70 microns; wherein, the NMP aqueous solution is obtained by mixing NMP and deionized water at a volume ratio of 1:1;

[0047] (3) Dissolve 0.3 g PBI in 10 g NMP, stir for 12 hours, and filter tw...

Embodiment 3

[0054] A method for preparing a cross-linked polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with high oxidation resistance, comprising the following steps:

[0055] (1) Dissolve 2 g of PBI in 1000 g of NMP, stir for 12 hours, and filter twice to remove impurities; then add 0.5 g of modified composite powder, and ultrasonicate for 30 minutes to obtain a casting solution;

[0056] (2) Inject the casting liquid obtained in step (1) into the cast film plate, and then place it in a constant temperature and humidity box with a humidity of 65% (humidity) and a temperature of 70°C for 0.5 hours to perform gas phase transformation, and then immerse in NMP Take it out after 3 hours in the aqueous solution, and dry it in vacuum at 100°C for 10 hours to obtain a porous inner layer with a thickness of 80 microns; wherein, the NMP aqueous solution is obtained by mixing NMP and deionized water at a volume ratio of 2:1;

[0057] (3) Dissolve 0.1 g PBI in 10 g NMP,...

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Abstract

The invention discloses a cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and a preparation method thereof. The cross-linking membrane takes free radical quencher-containing porous polybenzimidazole as a substrate; pores are filled with polybenzimidazole and organosilicone cross-linking resin. The cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention has good proton conducting capacity and excellent oxidation resistance without humidifying, and the problem about swelling after the polybenzimidazole is immersed into phosphoric acid is effectively solved. The cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohols fuel cell, an electrochemical sensor and other electrochemical devices to serve as a proton exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a cross-linked polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with high oxidation resistance 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, perfluorinated sulfonic acid membrane fuel cells represented by Nafion® are widely used at present, but the proton conductivity of this type of proton exchange membrane is greatly affected by the water content and temperature in the membrane, and the alcohol resistance performance is poor. The working temperature cannot exceed 80°C. Because PEMFC is limited by the operating temperature, it faces problems such as poor CO tolerance and difficult water and heat management of...

Claims

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Application Information

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IPC IPC(8): H01M8/1069H01M8/1086H01M8/1088H01M8/1051H01M8/1048
CPCH01M8/1048H01M8/1051H01M8/1069H01M8/1086H01M8/1088H01M2008/1095Y02E60/50
Inventor 于书淳何春霞杨汉嵩马晓星刘会雪
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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