Sandwich structured composite proton exchange membrane, and preparation method and use thereof

Abstract

The invention discloses a sandwich structured composite proton exchange membrane, and a preparation method and use thereof. The sandwich structured composite proton exchange membrane is formed by mutually laminating a piece of self-supported sulfonated surface perforated graphene oxide paper of a basis membrane and sulfonated polyether-ether-ketone polymer layers of outer membranes on two surfaces of the basis membrane; and the outer membranes and the basis membrane are mutually connected through hydrogen bonds. The sandwich structured composite proton exchange membrane disclosed by the invention has the advantages that: the introduced self-supported sulfonated surface perforated graphene oxide paper of the basis membrane is connected to a hydrophilic group; simultaneously, the slice layer surface of the self-supported sulfonated surface perforated graphene oxide paper is perforated, so that proton conduction of the proton exchange membrane is carried out easily; the water content in the composite membrane can be kept; furthermore, carbonyl, hydroxyl, carboxyl, phenolic hydroxyl and sulfonyl on the surface of the self-supported sulfonated surface perforated graphene oxide paper have amphiphilic properties and can be interacted with sulfonic acid groups on sulfonated polyether-ether-ketone at two sides of the composite membrane through the hydrogen bonds; therefore, the stability and the uniformity of the composite membrane are greatly improved after the sulfonation degree of the sulfonated polyether-ether-ketone is reduced; and in addition, high proton conductivity is kept.

Description

technical field [0001] The invention relates to a sandwich structure composite proton exchange membrane used in the field of direct methanol fuel cell or all-vanadium redox flow battery preparation and a preparation method thereof, more precisely, it is a composite membrane of sulfonated polyetheretherketone and graphene oxide The performance improvement belongs to the field of fuel cell proton exchange membrane. Background technique [0002] Direct methanol fuel cells (DMFCs), which use renewable methanol as fuel, have attracted researchers' attention in the past decade. However, there are still several problems to be solved to realize the commercialization of direct methanol fuel cells, such as the high cost and high methanol permeability of perfluorosulfonic acid polymer electrolyte membranes, low activity and poor durability of electrocatalysts. As the core component of direct methanol fuel cells, the proton exchange membrane mainly plays the dual functions of conductin...

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Problems solved by technology

However, although its proton conductivity can be improved by sulfonation, due to the huge aspect ratio of the sulfonated GO graphite flake structure, it hinders the diffusion of protons through the membrane while blocking methanol permeation.

In addition, in order to improve the proton conductivity of the composite membrane, increasing the proportion of sulfonated GO indefinitely will also lead to the gradual brittleness of the composite membrane.

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