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Composite high-temperature proton exchange membrane for fuel cell and preparation method and application of composite high-temperature proton exchange membrane

A proton exchange membrane and composite technology, which is applied in the field of composite high-temperature proton exchange membranes for fuel cells and its preparation, can solve problems such as the inability to anchor proton acids, the inability to improve the mechanical strength of the membrane, and the inability to realize the performance of high-temperature proton composite membranes. Achieve the effects of reducing the loss rate of phosphoric acid, increasing the amount of phosphoric acid adsorption, and improving the mechanical strength

Active Publication Date: 2020-12-15
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

But due to SiO 2 It does not conduct protons by itself, nor can it anchor proton acid, nor can it improve the mechanical strength of the membrane. Therefore, this method cannot achieve the performance of high-temperature proton composite membranes without humidification.

Method used

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  • Composite high-temperature proton exchange membrane for fuel cell and preparation method and application of composite high-temperature proton exchange membrane
  • Composite high-temperature proton exchange membrane for fuel cell and preparation method and application of composite high-temperature proton exchange membrane
  • Composite high-temperature proton exchange membrane for fuel cell and preparation method and application of composite high-temperature proton exchange membrane

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Experimental program
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Effect test

Embodiment 1

[0033] Polybenzimidazole and CeO 2 @C 3 N 4 Prepare a composite high-temperature proton exchange membrane as a raw material, and prepare it according to the following steps:

[0034] Step 1: Weigh 15g of dicyandiamide, put it in a crucible after fully grinding, then put it in a tube furnace for calcination, heat it from room temperature to 550°C, and the heating rate is 5°C min -1, air atmosphere, after heating up to the set temperature, keep it for 4 hours, cool down with the furnace, transfer it to a mortar and grind it carefully into powder, then wash it with 1M hydrochloric acid solution for 1.5 hours, and wash it with deionized water for 2 hours. Dry in an oven at 60°C. Then the obtained solid was mixed with 0.2 g of cerium nitrate, 50 g of deionized water was added, and magnetically stirred for 1 h to obtain a suspension. Subsequently, 1M KOH solution was added to the suspension to adjust the pH of the solution to 13, magnetically stirred for 2 hours, and centrifuged...

Embodiment 2

[0038] Step 1: Weigh 15g of dicyandiamide, put it in a crucible after fully grinding, then put it in a tube furnace for calcination, heat it from room temperature to 550°C, and the heating rate is 5°C min -1 , air atmosphere, after heating up to the set temperature, keep it for 4 hours, cool down with the furnace, transfer it to a mortar and grind it carefully into powder, then wash it with 1M hydrochloric acid solution for 1.5 hours, and wash it with deionized water for 2 hours. Dry in an oven at 60°C. Then the obtained solid was mixed with 0.25 g of cerium nitrate, 50 g of deionized water was added, and magnetically stirred for 1 h to obtain a suspension. Subsequently, 1M KOH solution was added to the suspension to adjust the pH of the solution to 13, magnetically stirred for 2 hours, and centrifuged to obtain a solid precipitate. Wash with plenty of deionized water until the pH of the solution is neutral. Finally, the material is completely dried in an oven, and calcined ...

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Abstract

The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a composite high-temperature proton exchange membrane for a fuel cell and a preparationmethod of the composite high-temperature proton exchange membrane. Raw materials comprise PBI, a compound A@B and phosphoric acid, wherein A is nanoparticles with a free radical quenching function; and B is C3N4 with a nanosheet structure; wherein the mass fraction of the compound A@B is 0.05-2 wt.%, and the mass ratio of A to B in the A@B is (1: 1)-(1: 20). The preparation method comprises the following steps: preparing a compound A@B, ultrasonically dispersing A@B by using a strong polar aprotic solvent to obtain a dispersion S1, then uniformly mixing and stirring PBI strong polar aprotic solvent to obtain a PBI solution S2, uniformly mixing S1 and S2 to obtain a membrane casting solution S3, casting on plate glass with a groove, drying, and soaking the membrane in phosphoric acid to obtain the composite membrane for the high-temperature proton fuel cell. The composite membrane has good mechanical properties and excellent conductivity, and shows good performance when applied to fuelcells.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a composite high-temperature proton exchange membrane for fuel cells and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an energy conversion device that can directly convert chemical energy into electrical energy. As long as it is continuously supplied with oxidant and reducing agent, it can continuously output electrical energy. High-temperature proton exchange membrane fuel cells have the advantages of high cell energy efficiency, good tolerance to CO, and relatively simple hydrothermal management system, and have become one of the hot issues in current research. When polybenzimidazole is used in high-temperature proton exchange membrane fuel cells, it must be doped with as much phosphoric acid as possible to ensure high proton conductivity. However, high phosphoric acid doping wi...

Claims

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Application Information

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IPC IPC(8): H01M8/124C08J7/14C08L79/04B82Y30/00B82Y40/00
CPCH01M8/124C08J7/14B82Y30/00B82Y40/00C08J2379/04Y02E60/50H01M8/103H01M8/1097C08K9/02H01M8/1048H01M8/1067H01M8/1088H01M8/1051C08J5/2256C08J3/2053C08J5/2287
Inventor 邵志刚吕波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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