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Porous polymer ion exchange membrane based on polybenzimidazole, preparation method of porous polymer ion exchange membrane by adopting sol-gel method, and application of porous polymer ion exchange membrane

A porous polymer and ion exchange membrane technology, applied in the field of polybenzimidazole-based porous polymer ion exchange membrane, sol-gel method preparation, to achieve easy mass production, avoid the reduction of polymer oxidation stability, broaden the Effects of type and scope

Active Publication Date: 2021-01-22
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes it possible to design batteries with electrode spacing less than 100 mm, that is, gas diffusion electrodes directly in contact with the membrane (J.Hydrogen Energy., 2011, 36, 15089), so anion exchange membranes based on quaternary ammonium salt functionalized polymers have recently received a lot of attention. Much attention has been paid, but improving polymer backbone structures for improved long-term stability as well as anion-exchange moieties in the hydroxide ionomer form remains a formidable challenge

Method used

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  • Porous polymer ion exchange membrane based on polybenzimidazole, preparation method of porous polymer ion exchange membrane by adopting sol-gel method, and application of porous polymer ion exchange membrane
  • Porous polymer ion exchange membrane based on polybenzimidazole, preparation method of porous polymer ion exchange membrane by adopting sol-gel method, and application of porous polymer ion exchange membrane
  • Porous polymer ion exchange membrane based on polybenzimidazole, preparation method of porous polymer ion exchange membrane by adopting sol-gel method, and application of porous polymer ion exchange membrane

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Experimental program
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Effect test

Embodiment 1

[0039] A kind of method adopting sol-gel method to prepare the porous polymer ion-exchange membrane based on polybenzimidazole, comprises the following steps:

[0040] 1. Preparation of stable solution.

[0041] Isophthalic acid (6.230g) and biphenyl tetramine (8.037g) are dissolved in the PPA of 300g, and the pH of adjusting solution is 1, obtains stable, transparent solution, is fully stirred under 110 ℃ at temperature, then in Polymerization at 250°C for 24h;

[0042] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by sol-gel method. This step is as follows: slowly immerse the cleaned 20*20cm glass plate in the solution with a temperature of 250°C after polymerization, let it stand for 10 minutes, and pull the glass plate vertically upward at a speed of 0.05m / s. Immediately heat treatment in a steam atmosphere with a humidity of 50% for 24 hours to solidify and form a film, and repeat 5 times to obtain a film with a certain thickness. Soak the me...

Embodiment 2

[0049] A kind of method adopting sol-gel method to prepare the porous polymer ion-exchange membrane based on polybenzimidazole, comprises the following steps:

[0050] 1. The preparation steps of the stable solution are the same as in Example 1.

[0051] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by sol-gel method. This step is as follows: slowly immerse the cleaned 20*20cm glass plate in the solution with a temperature of 250°C after polymerization, let it stand for 10 minutes, and pull the glass plate vertically upward at a speed of 0.05m / s. Immediately heat treatment in a steam atmosphere with a humidity of 60% for 24 hours to solidify and form a film, and repeat 5 times to obtain a film with a certain thickness. Soak the membrane in 1M ammonium hydroxide at 80°C for 12 hours to fully wash away the phosphoric acid in the membrane, then place the membrane in deionized water at 50°C for 12 hours, wash away the residual impurities, and dry it in ...

Embodiment 3

[0054] A kind of method adopting sol-gel method to prepare the porous polymer ion-exchange membrane based on polybenzimidazole, comprises the following steps:

[0055] 1. The preparation steps of the stable solution are consistent with Example 1.

[0056] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by sol-gel method. This step is as follows: slowly immerse the cleaned 20*20cm glass plate in the solution with a temperature of 250°C after polymerization, let it stand for 10 minutes, and pull the glass plate vertically upward at a speed of 0.05m / s. Immediately heat treatment in a steam atmosphere with a humidity of 70% for 24 hours to solidify and form a film, and repeat 5 times to obtain a film with a certain thickness. Soak the membrane in 1M ammonium hydroxide at 80°C for 12 hours to fully wash away the phosphoric acid in the membrane, then place the membrane in deionized water at 50°C for 12 hours, wash away the residual impurities, and dry it in...

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Abstract

The invention discloses a porous polymer ion exchange membrane based on polybenzimidazole, a preparation method of the porous polymer ion exchange membrane by adopting a sol-gel method, and application of the porous polymer ion exchange membrane, wherein the porous membrane is prepared by a sol-gel method. The method comprises: casting a polybenzimidazole solution in polyphosphoric acid into a membrane, and in a process that the solution is hydrolyzed from polyphosphoric acid into phosphoric acid, observing transition of the solution state to a gel state; and after curing and film forming areperformed through a dip-coating method, reserving phosphoric acid in the gel structure of the membrane, and forming a spongy compact porous structure after phosphoric acid is washed away. According tothe invention, after the prepared porous membrane is doped with alkali, ion exchange transfer can be realized under the condition that ion exchange groups are not needed; the sol-gel method disclosedby the invention has the characteristics of low cost, simple process, easiness in large-area film formation, easiness in stoichiometric ratio control, high product purity and good uniformity; and theporous membrane prepared by the invention is applied to an alkaline water electrolytic cell after alkali doping, shows high ionic conductivity and stable mechanical properties, and has a very good application prospect in the alkaline water electrolytic cell.

Description

technical field [0001] The invention belongs to the technical field of alkaline water electrolyzer, relates to a porous polymer ion exchange membrane material, in particular to a polybenzimidazole-based porous polymer ion exchange membrane and its preparation method and application by sol-gel method . Background technique [0002] At present, electrochemical energy storage technology (that is, the storage of renewable energy surplus electricity in the form of hydrogen by splitting water electrochemically) has received more and more attention (IEEE, 2012, 100, 410). Proton exchange membrane (PEM) systems based on perfluorosulfonic acid membranes can produce high-purity hydrogen at high current densities, but are limited by electrode materials and catalysts in acidic environments, which hinders their large-scale application, making People began to turn to the traditional alkaline water electrolyzer technology. Under alkaline conditions, the relatively easy oxidation-reduction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B13/02C25B9/19C25B1/04C08G73/18C08J9/26C08J5/18C08L79/04
CPCC25B13/08C25B13/02C08G73/18C08J9/26C08J5/18C08J2379/04Y02E60/36
Inventor 李南文胡旭黄瑛达
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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