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Application of polybenzimidazole polymer containing side group in proton exchange membrane

A polybenzimidazole and proton exchange membrane technology, which is applied in the parts of fuel cells, solid electrolyte fuel cells, etc., can solve problems such as limited application and reduced proton conductivity, and achieve high doping level, high stability, Effects of high phosphoric acid doping levels and conductivity

Inactive Publication Date: 2015-02-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although traditional perfluorosulfonic acid membranes represented by Nafion and sulfonated aromatic polyether membranes have high conductivity, they are limited by the conduction mechanism and conduction medium so that they can be used at high temperatures (>100°C) ) The proton conductivity decreases significantly at low humidity
Therefore, its application in high temperature fuel cells is limited

Method used

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  • Application of polybenzimidazole polymer containing side group in proton exchange membrane
  • Application of polybenzimidazole polymer containing side group in proton exchange membrane
  • Application of polybenzimidazole polymer containing side group in proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Preparation of polybenzimidazole film containing benzene side group

[0032] Take 1.0000g polybenzimidazole polymer containing phenyl side groups, add 10ml DMSO, stir at room temperature until it completely dissolves into a homogeneous transparent brown solution, then pour the solution onto a clean 10cm×10cm glass plate, and Bake at 80°C for 12 hours, at 100°C for 12 hours, at 120°C for 12 hours, at 120°C for 24 hours under vacuum, and cool to room temperature to obtain a transparent polybenzimidazole film.

Embodiment 2

[0033] Example 2: Preparation of Phosphoric Acid Doped Polybenzimidazole Film Containing Benzene Side Groups

[0034] The polybenzimidazole film obtained in Example 1 was immersed in a petri dish filled with phosphoric acid with a mass concentration of 85%, and phosphoric acid adsorption was carried out at a high temperature of 160°C. Set different adsorption times, respectively: 3h, 12h, 36h, 72h, 108h, and filter the removed films (named: ph-3, ph-12, ph-36, ph-72, ph-108) with filter paper Wipe off the acid on the surface, and then bake in a vacuum oven at 100° C. for 5 hours to obtain polybenzimidazole films with different doping levels (see Table 1) containing benzene side groups.

Embodiment 3

[0035]Example 3: Testing of the proton conductivity of phosphoric acid-doped polybenzimidazole films containing benzene side groups

[0036] Using a Princeton Applied Research Model 2273 conductivity testing instrument model 2273, the conductivity of the membrane was tested by the four-electrode method. The test conditions were: the frequency of the AC impedance was 0.1-100kHz, and the amplitude was 10mV. The conductivities of films with different doping levels were tested in the temperature range of 80-200°C.

[0037] The test was carried out under dry conditions. A 50mm×10mm rectangular film sample was cut from the 5 films with different adsorption times obtained in Example 2, and the sample was fixed on a fixture to test its Proton conductivity in the temperature range of 80-200°C, among which the conductivity of the film with an adsorption time of 108h reaches 0.110S at 200°C. cm -1 , see figure 1 .

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Abstract

The invention discloses an application of a polybenzimidazole polymer containing a side group in a proton exchange membrane, belonging to the technical field of proton exchange membranes for high-temperature fuel cells. The polybenzimidazole polymer containing the side group is characterized in that the side group is introduced on a PBI molecular chain, and preferably, the polymer is polybenzimidazole containing meta-benzyl or polybenzimidazole containing a benzene side group. A preparation method of the proton exchange membrane comprises the following steps: dissolving the polybenzimidazole polymer containing the side group into DMSO, baking on a glass plate to form a thin film, and then soaking into phosphoric acid for 3-108 hours to prepare a proton exchange membrane of phosphoric acid doped polybenzimidazole containing the side group. The proton exchange membrane of phosphoric acid doped polybenzimidazole containing the side group disclosed by the invention has higher phosphoric acid doping level and conduction rate on the basis of keeping relatively good mechanical performance and chemical stability.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membranes for high-temperature fuel cells, and particularly relates to a side-group-containing polybenzimidazole polymer film with high phosphoric acid doping level, high stability and high proton conductivity, which can be used in high-temperature and low-humidity environments. The application of proton exchange membrane under work. Background technique [0002] In recent decades, proton exchange membrane fuel cells (PEMFCs) have attracted extensive attention from academia and industry due to their high efficiency and environmental protection. PEMFC is an energy conversion device that uses a polymer electrolyte membrane as a conductive medium to convert chemical energy into electrical energy. Among them, proton exchange membrane (PEM) is the core of PEMFC, and its performance plays a vital role. However, although traditional perfluorosulfonic acid membranes represented by Nafion and sul...

Claims

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Application Information

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IPC IPC(8): C08J7/14C08J5/22C08L79/08H01M8/02H01M8/10
CPCY02E60/50
Inventor 刘佰军李晓白凤鹏举马洪伟
Owner JILIN UNIV
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