NafionTM-modified carbon quantum dot-polymer hybrid proton exchange membrane and preparing method thereof

A proton exchange membrane, carbon quantum dot technology, applied in electrochemical generators, final product manufacturing, sustainable manufacturing/processing, etc. rate reduction, good industrial production basis, and the effect of improving high temperature water retention

Inactive Publication Date: 2017-03-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The carbon quantum dots also make the permeation channel of methanol in the membrane more tortuous through the interaction with the membrane matrix, thus reducing the methanol permeability of the hybrid membrane by 50%.

Method used

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  • NafionTM-modified carbon quantum dot-polymer hybrid proton exchange membrane and preparing method thereof
  • NafionTM-modified carbon quantum dot-polymer hybrid proton exchange membrane and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix 2 ml of 50 mg / mL citric acid aqueous solution with 1 mL of commercially available Nafion TM The polymer solutions were mixed, sonicated for 2 h, and freeze-dried. The obtained solid was placed in a tube furnace, heated to 200°C under the protection of nitrogen, reacted for 1 h, purified by dialysis and freeze-dried to obtain Nafion TM Modified carbon quantum dots;

[0018] (2) Nafion TM Preparation of modified carbon quantum dots-polymer hybrid proton exchange membrane: 1 mg of Nafion TM Modified carbon quantum dots with 4 ml of commercially available Nafion TM The solutions were mixed and ultrasonicated for 20 min; the resulting mixture was removed by rotary evaporation to remove most of the solvent, then 4 ml of N,N-dimethylformamide was added, and rotary evaporation was continued for 20 min; after standing for 1.5 h, the above Nafion TM The casting liquid is poured into a mold with a size of 2cm×5cm, and placed in a vacuum oven, starting from 70°C for 2 h...

Embodiment 2

[0026] (1) Mix 1 mL of 50 mg / mL citric acid aqueous solution with 1 mL of commercially available Nafion TM The polymer solutions were mixed, sonicated for 2.5 h, and freeze-dried. The obtained solid was placed in a tube furnace, heated to 150°C under the protection of nitrogen, reacted for 2 h, purified by dialysis and freeze-dried to obtain Nafion TM Modified carbon quantum dots;

[0027] (2) Nafion TM Preparation of modified carbon quantum dots-polymer hybrid proton exchange membrane: 1 mg of Nafion TM Modified carbon quantum dots with 4 ml of commercially available Nafion TM The solutions were mixed and ultrasonicated for 20 min; the resulting mixture was removed by rotary evaporation to remove most of the solvent, then 4 ml of N,N-dimethylformamide was added, and rotary evaporation was continued for 20 min; after standing for 1.5 h, the above Nafion TM The casting liquid is poured into a mold with a size of 2cm×5cm, and placed in a vacuum oven, starting from 65°C for 3...

Embodiment 3

[0029] (1) Mix 3 mL of 100 mg / mL citric acid aqueous solution with 1 mL of commercially available Nafion TM The polymer solutions were mixed, sonicated for 3 h, and freeze-dried. The obtained solid was placed in a tube furnace, heated to 300°C under the protection of nitrogen, reacted for 0.5 h, purified by dialysis and freeze-dried to obtain Nafion TM Modified carbon quantum dots;

[0030] (2) Nafion TM Preparation of modified carbon quantum dots-polymer hybrid proton exchange membrane: 1 mg of Nafion TM Modified carbon quantum dots with 4 ml of commercially available Nafion TM The solutions were mixed and ultrasonicated for 20 min; the resulting mixture was removed by rotary evaporation to remove most of the solvent, then 4 ml of N,N-dimethylformamide was added, and rotary evaporation was continued for 20 min; after standing for 1.5 h, the above Nafion TM The casting liquid is poured into a mold with a size of 2cm × 5cm, and placed in a vacuum oven, starting from 70°C fo...

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Abstract

The invention belongs to the technical field of membranes, and particularly relates to a NafionTM-modified carbon quantum dot-polymer hybrid proton exchange membrane and a preparing method thereof. According to the method, polymer NafionTM and citric acid are firstly mixed and reacted under nitrogen protection to obtain NafionTM-modified carbon quantum dots, and then the prepared carbon quantum dots are mixed with a polymer solution to prepare the hybrid proton exchange membrane. Because of modification with the NafionTM, the carbon quantum dots have good dispersibility in the polymer matrix, and the proton conductivity of the prepared hybrid proton exchange membrane is increased by an order of magnitude. Through interaction between the carbon quantum dots and a membrane matrix, permeability channels of methanol in the membrane are more winding. The method has characteristics of simple and convenient operation, environment protection, easy batch and large-scale production, good industrial production bases and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a Nafion TM Modified carbon quantum dot-polymer hybrid proton exchange membrane and its preparation method. Background technique [0002] The proton exchange membrane fuel cell is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy by means of electrochemical reaction without combustion. As a clean, efficient and safe green energy source, proton exchange membrane fuel cells have shown broad market prospects and received widespread attention. As a key component of a fuel cell—the proton exchange membrane, its performance significantly affects the performance of the fuel cell. It provides channels for the migration and transport of protons, and its comprehensive performance plays a vital role in the development of high-performance fuel cells. effect. However, due to the co-transport channels of methanol and protons, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1081H01M8/1046
CPCH01M8/1046H01M8/1081Y02E60/50Y02P70/50
Inventor 贾炜汤蓓蓓武培怡
Owner FUDAN UNIV
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