Proton exchange membrane and preparation method thereof

Abstract

The invention relates to the field of fuel cells, and in particular relates to a proton exchange membrane and a preparation method thereof. The method comprises the following steps of (A) dissolving proton exchange membrane resin into an organic solvent to obtain a mixed solution with the mass concentration of 1 to 20 percent; (B) sequentially adding nano metal oxide and a surface active agent into the mixed solution and uniformly stirring to obtain a proton exchange membrane solution, wherein the mass ratio of the nano metal oxide to the proton exchange membrane resin is 0.1: 1 to 0.1: 100, and the addition quantity of the surface active agent is 0.1 to 5 percent of the sum of the mass of the nano metal oxide and the proton exchange membrane resin; and (C) casting the proton exchange membrane solution to form a membrane or casting the proton exchange membrane solution into a porous film to form a uniform proton exchange composite membrane. By adopting the proton exchange membrane and the preparation method thereof, the uniformity and self wetting capacity of the proton exchange membrane can be improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) have attracted extensive attention due to their high energy density, high energy conversion efficiency, easy operation, and environmental friendliness. As an important part of the fuel cell, the proton exchange membrane must be in the presence of a certain amount of water to ensure the operation of the fuel cell. Therefore, the proton exchange membrane must have a certain moisture retention capacity. [0003] The commonly used moisturizing methods can be divided into two types: external humidification and internal humidification according to the degree of integration with the stack: external humidification is to separate the humidification subsystem from the battery, and humidify before the reaction gas enters the battery; internal humidification Humid...

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Problems solved by technology

[0005] In order to enhance the self-humidification ability of the proton exchange membrane with self-humidification ability, the main research work is currently focused on modifying the proton exchange membrane, such as nano-scale SiO 2 、TiO 2 Or their mixture is doped in the proton exchange membrane solution to recast into a membrane. However, due to the small particle diameter, large specific surface area and high surface energy of nano-metal oxides, the particles are easy to agglomerate in the solution into micron-scale Agglomerates, and the formed agglomerates can not be effectively dispersed, on the one hand, the uneven dispersion of nano-metal oxides will affect the stability and rheological properties of the solution, on the other hand, it will also make the prepared protons The conductivity of the exchange membrane is unevenly dispersed, and the conductivity changes greatly, which affects the distribution of the chemically synthesized water on the surface of the proton exchange membrane, which has a serious impact on the consistency and electrochemical performance of the battery.

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