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Nafion/g-C3N4 composite film as well as preparation method and application thereof

A g-c3n4, composite membrane technology, applied in fuel cells, electrochemical generators, electrical components, etc., can solve problems such as inability to apply low temperature systems, low battery maximum power density, etc.

Active Publication Date: 2021-05-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huijuan Bai et al. put g-C 3 N 4 Added to PES-PVP, used in high-temperature proton exchange membrane fuel cells, although it also achieves good results, but can not be applied to low-temperature systems, only when the battery operating temperature is higher than 120 ° C, it has potential for use, and its composite membrane assembly The maximum power of the battery is 634mW cm -2 , far lower than the highest power density of the battery assembled with the patented composite film of 1.38W cm -2

Method used

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  • Nafion/g-C3N4 composite film as well as preparation method and application thereof
  • Nafion/g-C3N4 composite film as well as preparation method and application thereof
  • Nafion/g-C3N4 composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 100.1017g Nafion D520 solution and evaporate to dryness at 80 DEG C, time is 24h, obtain resin and redissolve with 95.0247gDMF again, obtain the Nafion solution that solute mass fraction is 5%, take 8.0124g above-mentioned solute mass fraction and be 5% Nafion solution, Add to it containing 1.0mg g-C 3 N 4 (obtained by calcining dicyandiamide as a precursor, g-C 3 N 4 dispersed in 2gDMF), stirred for 2h, ultrasonically dispersed for 4h, dried at 80°C for 24h to obtain a composite film, in which g-C 3 N 4 Relative to the mass ratio of Nafion resin is 0.25%, named 0.25% g-C 3 N 4 / Nafion. The prepared composite film was exposed to 0.5 M H at 80 °C 2 SO 4 Boil in the solution for 1 hour, then wash with 80°C deionized water until the washing solution is neutral, then dry in an oven at 80°C, and set aside.

[0027] figure 1 a with figure 1 b are the surface and cross-sectional SEM images of the composite membrane obtained in Example 1, respectively. It can be...

Embodiment 2

[0031] Get 40.0047g Nafion D520 solution and evaporate to dryness at 90 DEG C, time is 28h, obtain resin and redissolve with 48.0522gDMAc again, obtain the Nafion solution that solute mass fraction is 4%, get 10.0017g above-mentioned solute mass fraction and be 4% Nafion solution, Add to it containing 2.0mg g-C 3 N 4 (obtained by calcination with melamine as precursor, g-C 3 N 4 dispersed in 2g DMF), stirred for 5h, ultrasonically dispersed for 10h, dried at 90°C for 16h to obtain a composite film, in which g-C 3 N 4 Relative to the mass ratio of Nafion resin is 0.5%, named 0.5% g-C 3 N 4 / Nafion. The prepared composite film was exposed to 0.5 M H at 80 °C 2 SO 4 Boil in the solution for 1 hour, then wash with 80°C deionized water until the washing solution is neutral, then dry in an oven at 80°C, and set aside.

Embodiment 3

[0033] Get 100.1044g Nafion D520 solution and evaporate to dryness at 90 DEG C, time is 20h, obtain resin and redissolve with 45.0247gNMP again, obtain the Nafion solution that solute mass fraction is 10%, get 4.0124g above-mentioned solute mass fraction and be 10% Nafion solution, Add 3.0mg g-C to it 3 N 4 (obtained by calcining dicyandiamide as a precursor, g-C 3 N 4 dispersed in 2gDMF), stirred for 10h, ultrasonically dispersed for 10h, dried at 90°C for 16h to obtain a composite film, in which g-C 3 N 4 Relative to the mass ratio of Nafion resin is 0.75%, named 0.75% g-C 3 N 4 / Nafion. The prepared composite film was exposed to 0.5 M H at 80 °C 2 SO 4 Boil in the solution for 1 hour, then wash with 80°C deionized water until the washing solution is neutral, then dry in an oven at 80°C, and set aside.

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Abstract

The invention provides a Nafion / g-C3N4 composite membrane as well as a preparation method and application thereof, particularly relates to a composite membrane prepared by compounding protonated carbon nitride and Nafion resin, and belongs to the technical field of proton exchange membrane fuel cells. The preparation method comprises the following steps: firstly dissolving Nafion resin in a high-boiling-point solvent, then adding a dispersed g-C3N4 suspension into the Nafion solution, stirring, performing uniform ultrasonic treatment, pouring into a mold, and drying at a certain temperature to form a film, thereby obtaining the composite film. The conductivity of the composite film doped with g-C3N4 is obviously improved, and the polarization performance of a single cell is superior to that of a commercial Nafion 211 film.

Description

technical field [0001] The present invention relates to a kind of Nafion / g-C 3 N 4 Composite membrane and its preparation method and application, belonging to the technical field of proton exchange membrane fuel cell Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, clean, and environmentally friendly power generation device. It is a reliable power source for electric vehicles, and can also be used as a civilian military power supply such as distributed power stations, submarines, spacecraft, and aircraft, as well as portable small power supplies, etc. , has broad application prospects. Currently widely used is the The representative perfluorosulfonic acid proton exchange membrane, this kind of proton exchange membrane has excellent proton transfer performance, but its use in high temperature and low humidity conditions is limited, researchers often use organic-inorganic composite strategy to improve it properties to improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1048H01M8/1069H01M8/1086
CPCH01M8/1048H01M8/1069H01M8/1086H01M2008/1095Y02E60/50
Inventor 周利栾邹杰黄河邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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