Composite membrane for acid-base water electrolysis as well as preparation method and application thereof

A composite membrane and water electrolysis technology, which is applied in the field of water electrolysis, can solve problems such as huge difference in molecular structure, large membrane resistance of bipolar membranes, and offset technical advantages, so as to improve battery performance and mechanical strength, reduce decomposition voltage, and avoid membrane The effect of large resistance
CN112126946AActive Publication Date: 2020-12-25DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2020-12-25

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Abstract

The invention belongs to the field of water electrolysis, and particularly relates to a composite membrane for acid-base water electrolysis as well as preparation and application thereof. The raw materials are polybenzimidazole and C3N4, wherein the mass fraction of the C3N4 is 0.1-1.5 wt.%. The preparation method comprises the steps of preparing polybenzimidazole and C3N4 nanosheets, respectivelydispersing PBI and C3N4 nanosheets in a solvent to obtain a PBI solution S1 and a C3N4 nanosheet dispersion solution S2, uniformly mixing S1 and S2, stirring to obtain a membrane casting solution S3,casting the membrane casting solution S3 on plate glass with a groove, and carrying out vacuum drying to obtain the composite membrane for acid-base water electrolysis. The composite membrane has good mechanical properties, can significantly reduce the decomposition voltage of water electrolysis and reduce energy consumption when applied to acid-base water electrolysis, and shows good battery performance.
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Description

technical field

[0001] The invention belongs to the field of water electrolysis, and in particular relates to a composite membrane for acid-base water electrolysis, a preparation method and application thereof. 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%. Conventional water electrolysis research mainly focuses on alkaline water electrolysis, alkaline solid electrolyte water electrolysis, proton exchange membrane water electrolysis, and high-temperature solid oxide water electrolysis. However, the above water electrolysis has the problem that the kinetic rate of the acidic oxygen evolution reaction (OER) is slow or the kinetic rate of the alkaline hydrogen evolution reaction (HER) is slow, resu...

Claims

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