A composite membrane for acid-base water electrolysis and its preparation method and application

Abstract

The invention belongs to the field of water electrolysis, and in particular relates to a composite membrane for acid-base water electrolysis and its preparation and application. The raw materials are polybenzimidazole and C 3 N 4 , C 3 N 4 The mass fraction is 0.1‑1.5wt.%; first prepare polybenzimidazole and C 3 N 4 nanosheets, then PBI and C 3 N 4 The nanosheets were dispersed in the solvent respectively to obtain PBI solutions S1, C 3 N 4 The nanosheet dispersion S2, S1 and S2 are uniformly mixed and stirred to obtain the casting solution S3, which is cast on a flat glass with grooves, and vacuum-dried to obtain a composite membrane for acid-base water electrolysis. The composite membrane has good mechanical properties, and when applied in acid-base water electrolysis, it can significantly reduce the decomposition voltage of water electrolysis, reduce energy consumption, and exhibit good battery performance.

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...

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