Porous material for fuel cell electrolyte membrane, method for producing the same, electrolyte membrane for solid polymer fuel cell, membrane electrode assembly (MEA), and fuel cell

摘要

According to the present invention, a porous material for a fuel cell electrolyte membrane, wherein at least one strength auxiliary layer is provided inside and/or on the surface of a high porosity layer, the high porosity layer and the strength auxiliary layer constitute a multilayer structure, and the average diameter of pores of the high porosity layer is different from the average diameter of pores of the strength auxiliary layer, is provided. Also, a porous material having high porosity and high strength, which is suitable as a base material for an electrolyte membrane of a solid polymer fuel cell, is provided and a high-performance fuel cell using such material is realized.

主权项

1. A porous material for a fuel cell electrolyte membrane, wherein at least one strength auxiliary layer is provided inside and/or on a surface of a high porosity layer, the high porosity layer and the at least one strength auxiliary layer constitute a multilayer structure, and an average diameter of pores of the high porosity layer is different from an average diameter of pores of the strength auxiliary layer,
wherein the average diameter of pores of the at least one strength auxiliary layer is 0.01 to 10 μm and the average diameter of pores of the strength auxiliary layer is larger than a largest through-hole diameter of the high porosity layer, wherein the at least one strength auxiliary layer has a dense portion with through holes which is finger-void porous structure, and wherein the high porosity layer has a sponge-like bicontinuous structure which is fibrillar structure and has more porosity than the dense portion of the strength auxiliary layer.