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Composite membrane for high-temperature water electrolysis as well as preparation method and application thereof

A technology of high-temperature water and composite membrane, which is applied in application, electrolysis process, electrolysis components, etc., can solve the problems of limited improvement effect of proton conductivity, strong catalyst poisoning effect, low conductivity of ionic liquid, etc., and achieve excellent mechanical strength, good Excellent proton conductivity and thermal stability

Active Publication Date: 2020-12-22
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

However, this method has a limited effect on improving the proton conductivity of the membrane, and the maximum operating temperature is 120°C
J.Mater.Chem, 2006, 16, 2256–2265 Doping ionic liquids in PVDF membranes to prepare composite membranes can get rid of the disadvantages that proton conduction depends on water, but ionic liquids have disadvantages such as low conductivity and large poisoning effect on catalysts. , it is currently not practical to apply

Method used

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  • Composite membrane for high-temperature water electrolysis as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step1: Weigh 7.24g of cesium sulfate (0.02mol) and 2.0g of concentrated sulfuric acid (98%, 0.02mol), add slowly to 50ml of deionized water respectively, stir fully with a glass rod, and obtain a transparent and clear solution after fully reacting. After the solution is put into an oven for drying, cesium bisulfate is obtained;

[0025] Step2: Weigh 0.03g mPBI, 0.06g PVDF and dissolve in 27g NMP, stir magnetically for 6 hours to obtain a polymer solution;

[0026] Step3: Weigh 0.21g of cesium bisulfate prepared in Step1 and add it to the polymer solution in Step2, ultrasonically disperse, the ultrasonic power is 200W, and the ultrasonic time is 10h, to obtain a milky white casting solution, which is cast on a flat glass with grooves, After vacuum drying at 80° C. for 30 h, a composite proton exchange membrane for a high-temperature fuel cell was obtained.

Embodiment 2

[0028] Step1: Weigh 7.24g of cesium sulfate (0.02mol) and 4.0g of concentrated sulfuric acid (98%, 0.04mol), add slowly to 70ml of deionized water respectively, stir fully with a glass rod, and obtain a transparent and clear solution after fully reacting. After the solution is put into an oven for drying, cesium dihydrogen sulfate is obtained;

[0029] Step2: Weigh 0.01gmPBI, 0.04g PVDF, 0.01g PTFE and dissolve / disperse in 30gDMAc, stir magnetically for 6h to obtain a polymer solution;

[0030] Step3: Weigh 0.24g of cesium dihydrogen sulfate prepared in Step1 and add it to the polymer solution in Step2, ultrasonically disperse, the ultrasonic power is 300W, and the ultrasonic time is 12h, to obtain a milky white film casting solution, which is cast on a flat glass with grooves , 80 DEG C vacuum drying for 30 hours to obtain a composite proton exchange membrane for high-temperature fuel cells.

Embodiment 3

[0032] Step1: Weigh 7.24g of cesium sulfate (0.02mol) and 4.0g of concentrated sulfuric acid (98%, 0.04mol), add slowly to 70ml of deionized water respectively, stir fully with a glass rod, and obtain a transparent and clear solution after fully reacting. After the solution is put into an oven for drying, cesium dihydrogen sulfate is obtained;

[0033] Step2: Weigh 0.045g mPBI, 0.006g PVDF and dissolve in 30g DMAc, stir magnetically for 6 hours to obtain a polymer solution;

[0034] Step3: Weigh 0.20g of cesium dihydrogen sulfate prepared in Step1 and add it to the polymer solution in Step2, ultrasonically disperse, the ultrasonic power is 300W, and the ultrasonic time is 12h, to obtain a milky white casting solution, which is cast on a flat glass with grooves , 80 DEG C vacuum drying for 30 hours to obtain a composite proton exchange membrane for high-temperature fuel cells.

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Abstract

The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a high-temperature water electrolysis composite membrane and a preparation method and application thereof. The composite membrane comprises the following raw materials: polybenzimidazole, fluorocarbon resin and a proton conductor, wherein the mass fraction of the proton conductor is 20-85 wt.%, the mass fraction of polybenzimidazole resin is 0.8-15 wt.%, and the mass fraction of the fluorocarbon resin is 0.8-20 wt.%; and the proton conductor is one or two selected from cesium hydrogen sulfate and cesium dihydrogen sulfate. The preparation method comprises the following steps: preparing the high-temperature proton conductor, dissolving the polybenzimidazole and the fluorocarbon resin in an aprotic solvent with strong polarity to obtain a polymer solution, adding the proton conductor into the polymer solution, carrying out ultrasonic dispersion to obtain a uniformly-dispersedmembrane casting solution, casting the uniformly-dispersed membrane casting solution on plate glass with a groove, and carrying out vacuum drying to obtain the high-temperature water electrolysis composite membrane. The composite membrane has good proton conductivity at high temperature, and shows good performance when applied to high-temperature water electrolysis.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a high-temperature water electrolysis composite membrane and its preparation method and application. Background technique [0002] Water electrolysis provides an energy conversion route to produce hydrogen from water. If the power source of electrolyzed water is completely from renewable energy, it can truly realize CO 2 zero emissions. The purity of hydrogen obtained in this way is very high, which can reach more than 99.99%. However, the research direction of conventional water electrolysis is still mainly focused on the electrolysis of liquid water, which brings a series of problems such as low electrode kinetic reaction rate, large amount of noble metal catalyst, and low electrolysis energy utilization rate. [0003] High-temperature water electrolysis uses water vapor as raw material to electrolyze hydrogen, which has the advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B1/10H01M8/1048H01M8/1069B29D7/01
CPCC25B13/08H01M8/1048H01M8/1069B29D7/01Y02E60/50Y02E60/36
Inventor 邵志刚吕波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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