Patent ID: 8470494

Claim:
A membrane-electrode assembly for a fuel cell, comprising: a first substrate; a second substrate facing the first substrate; and a catalyst layer between the first substrate and the second substrate and having a h 1 /t 1 ratio of about 0.5 or more, wherein: s 1 represents a point on the first substrate at one end of the catalyst layer; h 1 represents a distance between the first substrate and the second substrate; s 2 represents a point on the first substrate closest to s 1 at which a height (h) of the catalyst layer becomes h 1 ; and t 1 represents the distance between the s 1 and the s 2 , and wherein the first substrate is a polymer electrolyte membrane and the second substrate is an electrode substrate, or the first substrate is the electrode substrate and the second substrate is the polymer electrolyte membrane.