Patent ID: 8076040

Claim:
A direct oxidation fuel cell comprising at least one unit cell, said unit cell including: a membrane-electrode assembly comprising an electrolyte membrane sandwiched between an anode and a cathode, each of said anode and said cathode including a catalyst layer and a diffusion layer; an anode-side separator with a fuel flow channel for supplying an aqueous solution of organic fuel to said anode; and a cathode-side separator with an oxidant flow channel for supplying an oxidant containing oxygen gas to said cathode, wherein said fuel flow channel and said oxidant flow channel are so structured that the flow direction of said aqueous solution of organic fuel and the flow direction of said oxidant are the same, and the concentration of the oxygen gas in said oxidant flow channel is higher at a part opposing an upstream part of said fuel flow channel than at a part opposing a downstream part of said fuel flow channel.