Patent ID: 7781110

Claim:
A fuel cell system comprising: an aqueous solution tank which holds fuel aqueous solution; a fuel cell including an anode supplied with the fuel aqueous solution from the aqueous solution tank, and a cathode provided with a catalyst; an aqueous solution pipe connected to the aqueous solution tank and arranged to withdraw the fuel aqueous solution as a fluid from the aqueous solution tank and to supply the fuel aqueous solution to the anode; a pipe connected to the anode and arranged to supply gasified fuel aqueous solution and carbon dioxide from the anode to the aqueous solution tank; an air supplying unit including an air pump and arranged to supply air to the cathode in the fuel cell; and a gas guide arranged to withdraw a gas including the gasified fuel aqueous solution and the carbon dioxide from the aqueous solution tank and to add the gas including the gasified fuel aqueous solution and the carbon dioxide to the air to be sent to the cathode; wherein the gas guide extends from the aqueous solution tank toward the cathode without first reaching the anode.