Multi-layer moisture making compound film for proton exchange film fuel cell and its making method

Abstract

The invention relates to a multiple-layer complex proton exchange film for the fuel battery in particular to a multiple-layer self-humidifying complex film and preparing method for the proton exchange film fuel battery. The complex film comprises the following parts: a porous strengthening film and a self-humidifying complex layer, wherein the proton exchange film resin is poured and painted on the porous strengthening film and the strengthening complex film is formed, the self-humidifying complex layer is poured and painted at two sides of the strengthening complex film, the self-humidifying complex layer is comprised by the metal accelerant and the proton exchange film resin(the mass ratio of the accelerant(pt) and the proton exchange film resin is 0.0005:1-0.01:1), the proton exchange film resin can be perfluorine sulfonic acid resin, sulfonated polyarylethersulfone, sulfonated polyetheretherketone, partial sulfonated polystyrene fluoride, partial sulfonated polyarylethersulfone fluoride, or partial polyaryletheretherketone fluoride. The multiple-layer self-humidifying complex film is provided with the good steady, the high proton conductivity and the good self-humidifying property.

Description

technical field [0001] The invention relates to a multilayer composite proton exchange membrane for a fuel cell, in particular to a multilayer self-humidifying composite proton exchange membrane for a fuel cell consisting of a proton exchange membrane resin, a porous reinforced membrane and a composite layer containing a catalyst / oxide Membranes and methods for their preparation. Background technique [0002] In a proton exchange membrane fuel cell (PEMFC), the proton exchange membrane performs the dual function of conducting protons and separating fuel and oxidant. The perfluorinated sulfonic acid proton exchange membrane (Nafion) developed by DuPont in the United States in the late 1960s is now commonly used in PEMFC.  Membrane), although this membrane has obvious advantages in terms of structure and performance, it also has some shortcomings: First, because the conductivity of the membrane depends on the water content in the membrane, the PEMFC can only be used in the s...

AI Technical Summary

Problems solved by technology

The perfluorinated sulfonic acid proton exchange membrane (Nafion) developed by DuPont in the United States in the late 1960s is now commonly used in PEMFC.  Membrane), although this membrane has obvious advantages in terms of structure and performance, it also has some shortcomings: First, because the conductivity of the membrane depends on the water content in the membrane, the PEMFC can only be used in the state of humidified gas Second, due to the low glass transition temperature (130°C) of perfluorosulfonic acid resin, the thermal stability of the film is poor; the third is that the mechanical strength and dimensional stability of the film also need to be improved. In addition, perfluorosulfonic acid The high fuel permeation rate and price of the membrane have become the main factors restricting the large-scale application of proton exchange membrane fuel cells, so the development of new proton exchange membranes suitable for PEMFC has important practical significance

[0003] With the increasing demand for PEMFC technology and the emergence of new materials with excellent chemical properties, mechanical properties and low cost in recent years, people have researched and developed a variety of non-fluorine proton exchange membrane materials, such as direct copolymerization into sulfonated Polyaryl ether sulfone (ketone) (SPSU), sulfonated polyether ether ketone (SPEEK), sulfonated poly(ether) sulfone (SPESU) and sulfonated polytrifluorostyrene (SPTFS), etc., however, are currently being studied From the perspective of the performance of the developed non-fluorine material proton exchange membranes, they generally have two problems: one is the contradiction between high proton conductivity and low mechanical stability, which are mostly prepared by cross-linking modification or composite The solution is to strengthen the membrane, such as documents 1 and 2 [US Patent 20032739 and WO 2005080483] by adding polyols to the sulfonated polyetheretherketone proton exchange membrane material as a cross-linking agent to form a covalently cross-linked structure. To increase the strength of the membrane, literature 3 [Fuel Cells, 5 (2005), 406-411] and literature 4 [Electrochemistry, 10 (2004), 27-34] reported the use of PTFE porous membranes to prepare SPEEK and SPTFS composite reinforced membranes. performance

[0008] In Document 16 [Electrochemical and Solid-State Letters, 7 (10) (2004) A315-A317], the Pt-C / SPEEK self-humidifying layer is compounded by using multiple pouring methods in the SPEEK / PTFE composite membrane , the membrane prepared by this method has good mechanical stability and self-humidification performance, but the preparation process of the multiple casting method is relatively complicated, and at the same time, since the self-humidification composite layer is made of SPEEK, it is easy to combine with the electrode Bad contact will increase the contact resistance of the battery

Images