Abstract: A membrane-electrode assembly in which an opening, a catalyst layer and a diffusing layer are placed within a cathode active region; a method for manufacturing the same; and a fuel cell system using the membrane-electrode assembly. The membrane-electrode assembly comprises: a cathode with a catalyst layer, an opening in the catalyst layer, and a diffusing layer; an anode with a catalyst layer and a diffusing layer; and an electrolyte membrane between the cathode and the anode. A hydrogen ion generated by oxidizing a liquid fuel is transferred to the cathode via the electrolyte membrane, and returns to the anode without reaction in the cathode, so that the hydrogen ion is reduced in the anode by receiving electrons from the anode, thereby generating hydrogen gas on the anode channel. The hydrogen gas is used as a high efficiency fuel, thereby enhancing the output performance of the fuel cell.

Abstract: A bipolar plate and a fuel cell stack using the same. The bipolar plate used in the fuel cell stack includes: a first plate having a fuel flow passage; and a second plate having an oxidant flow passage and a land, the land being on the second plate and formed to be partially opposite to the fuel flow passage. Further, the fuel cell stack includes: a polymer electrolyte membrane; an anode electrode and a cathode electrode respectively placed on opposite sides of the polymer electrolyte membrane; a first plate placed on the anode electrode, and having a fuel flow passage; and a second plate placed on the cathode electrode, and having an oxidant flow passage and a land, the land being on the second plate and formed to be partially opposite to the fuel flow passage.

Abstract: A fuel reforming system includes a plate type preferential CO oxidation unit, which removes CO from a hydrogen rich gas generated by a heat cracking unit. The plate type preferential CO oxidation unit mixes the hydrogen rich gas with oxygen and cools the hydrogen rich gas to an activating temperature of a CO removing catalyst.

Abstract: A fuel cell fuel tank includes a flexible pipe arranged within the fuel tank housing and coupled with a feeding pipe and a weight coupled with a free end of the flexible guiding pipe, so that a hydrogen containing fuel may be continuously supplied regardless of the orientation of the fuel tank.

Abstract: An injection nozzle assembly for a fuel cell system, the injection nozzle assembly including a housing defining a fuel chamber to accommodate hydrogen-containing fuel therein and coated with a reforming catalytic layer. An inlet is provided in a first side of the housing to introduce the hydrogen-containing fuel in the fuel chamber and an outlet is provided in a second side of the housing to discharge the hydrogen-containing fuel from the fuel chamber. An injection means is provided in the fuel chamber so that noise, vibration and power consumption due to operation of a fuel pump are reduced, and transformation efficiency for producing hydrogen ions and electrons from the hydrogen-containing fuel is increased.

Abstract: A fuel cell system including a stack provided with a plurality of unit cells generating electricity based on a chemical reaction between hydrogen gas and oxygen gas, and a reformer for supplying the hydrogen gas obtained by reforming hydrogen-containing fuel to the stack. A fuel storage tank is provided for storing the hydrogen-containing fuel to be supplied to the reformer and an air supplier is provided for supplying air to the stack. An injection nozzle assembly is detachably provided and includes an injection means placed in front of the inlet formed in the first side of the reformer to introduce the hydrogen-containing fuel from the fuel storage tank.

Abstract: Disclosed is a process for preparing a stable PROX reaction catalyst, comprising the steps of (a) preparing a catalyst platinum supported on alumina; (b) calcinating the catalyst from step (a) at 300˜600° C. for 2˜4 hours; (c) contacting the catalyst obtained from step (b) with hydrogen at 300° C.˜600° C. for 2˜4 hours to reduce the catalyst; and (d) dropping the temperature in the reduced catalyst from step (c) to less than 100° C. and then contacting the catalyst with a predetermined solvent and/or gas while elevating the temperature to 300° C.-600° C. The catalyst has Pt—Al arrangement, the content of Pt being 0.5˜7% by weight and has an overall shape of an oval.