Membrane electrode assembly and fuel cell with dendritic shape catalyst layer

摘要

Provided is a method of manufacturing a membrane electrode assembly including catalyst layers in both sides of a polymer electrolyte membrane, substance diffusion of the catalyst layer being improved, in which forming at least one of the catalyst layers includes at least: forming a first layer including one of a catalyst and a catalyst precursor on a surface of a sheet by vapor-phase deposition; forming a through hole in the first layer; forming a second layer including one of a catalyst and a catalyst precursor on a surface of the first layer having the through hole by vapor-phase deposition; joining a polymer electrolyte membrane to a surface of the second layer; and peeling off the sheet from the first layer.

主权项

1. A membrane electrode assembly comprising:
catalyst layers formed on both sides of a polymer electrolyte membrane, at least one of which has a dendritic shape, wherein the at least one catalyst layer having the dendritic shape includes a macrocrack and a through hole, and an opening ratio of the through hole in an area surrounded with the macrocrack of the at least one catalyst layer having the dendritic shape in a surface opposed to the polymer electrolyte membrane is 8% or more to 40% or less, and wherein the at least one catalyst layer having the dendritic shape has a two-layer structure of a dendritic porous layer and a dense layer, and the through hole penetrates only the dense layer.