Patent ID: 7316858

Claim:
A fuel cell system, comprising: a fuel cell stack including an anode, a cathode, and an electrolyte membrane disposed therebetween; a fuel supply unit connected to the anode by a fuel supply line and configured to supply fuel to the anode; an oxidant supply unit connected to the cathode by an air supply line configured to supply ozone and oxygen-including air to the cathode, wherein the oxidant supply unit comprises: a humidifier configured to humidify air sucked though the air supplying line; and an ozone generator configured to generator ozone to be added to air supplied to the cathode, wherein the ozone generator is provided at a portion of the supply line which connects the humidifier and the cathode so as to add ozone to the humidified air; and a fuel recycling device configured to return fuel exhausted from fuel cell stack back to the fuel supply unit.