Method for preparing polybenzimidazole-based porous polymer ion exchange membrane by adopting non-solvent induced phase inversion method, and application of polybenzimidazole-based porous polymer ion exchange membrane

A technology of porous polymers and ion exchange membranes, applied in the direction of organic diaphragms, etc., to optimize liquid holding capacity and other properties, avoid reduction in polymer oxidation stability, and uniform pore size

Active Publication Date: 2020-12-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the electrode spacing less than 100mm, that is, the battery design in which the gas diffusion type electrode is in direct contact with the membrane becomes possible (J.HydrogenEnergy., 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

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  • Method for preparing polybenzimidazole-based porous polymer ion exchange membrane by adopting non-solvent induced phase inversion method, and application of polybenzimidazole-based porous polymer ion exchange membrane
  • Method for preparing polybenzimidazole-based porous polymer ion exchange membrane by adopting non-solvent induced phase inversion method, and application of polybenzimidazole-based porous polymer ion exchange membrane
  • Method for preparing polybenzimidazole-based porous polymer ion exchange membrane by adopting non-solvent induced phase inversion method, and application of polybenzimidazole-based porous polymer ion exchange membrane

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Effect test

Embodiment 1

[0038] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0039] 1. Preparation of uniform film-forming solution.

[0040] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0041] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0042] The step is as follows: spread the PBI homogeneous solution with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in ethanol for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous membrane was washe...

Embodiment 2

[0049] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0050] 1. Preparation of uniform film-forming solution.

[0051] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0052] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0053] This step is specifically as follows: spread the uniform solution of PBI with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in ethyl acetate for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous...

Embodiment 3

[0056] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0057] 1. Preparation of uniform film-forming solution.

[0058] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0059] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0060] The step is as follows: spread the PBI homogeneous solution with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in dichloromethane for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous membrane w...

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Abstract

The invention discloses a method for preparing a polybenzimidazole-based porous polymer ion exchange membrane by adopting a non-solvent induced phase inversion method, and application of the polybenzimidazole-based porous polymer ion exchange membrane in an alkaline water electrolysis cell. According to the invention, the porous membrane is prepared by taking one or more of organic high-molecularpolymers with benzimidazole as raw materials and adopting a non-solvent induced phase inversion method; the porous membrane can realize ion exchange transfer without ion exchange groups; the porous membrane with high porosity, high solvent absorption, rapid electrolyte wetting and high mechanical strength can be prepared by a rapid non-solvent induced phase inversion method; and when the porous membrane prepared by the invention is applied to an alkaline water electrolytic cell after alkali doping, high ionic conductivity and stable mechanical properties are achieved, and a very good application prospect is achieved 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 method for preparing a polybenzimidazole-based porous polymer ion exchange membrane using a non-solvent-induced phase inversion method and its application . 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 re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/22C08L79/04C25B13/08
CPCC08J5/2256C08J5/2262C08J9/286C08J2379/04C25B13/08
Inventor 李南文胡旭黄瑛达
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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