Abstract: A polymer electrolyte membrane for a fuel cell has a crystalline fusion enthalpy measured by differential scanning calorimetry (DSC) of about 67.3 J/g or more. Such crystallinity improves dimensional stability, mechanical characteristics, and ion conductivity of the polymer electrolyte membrane.

Abstract: A catalyst for a fuel cell, a fuel cell system including the same, and associated methods, the catalyst including a platinum-metal alloy having a face-centered tetragonal structure, and a carrier, wherein the platinum-metal alloy shows a broad peak or a peak having two split tips at a 2? of about 65 to about 75 degrees in an XRD pattern using a Cu—K ? line, and the platinum-metal alloy is supported in the carrier and has an average particle size of about 1.5 to about 5 nm.

Abstract: The present invention is a stacked fuel cell system which is formed by stacking a plurality of electricity generators, each electricity generator having a membrane-electrode assembly and a separator provided with the membrane-electrode assembly. The stack comprises an aligner which is disposed at least one portion of the separator and which couples and aligns the plurality of electricity generators.

Abstract: A membrane-electrode assembly (MEA) for a fuel cell includes a fuel cell electrolyte membrane, an anode disposed at a first side of the electrolyte membrane, and a cathode disposed at a second side of the electrolyte membrane, wherein the cathode has a thickness and an area, the cathode area extending in a plane substantially parallel to a major surface of the electrolyte membrane, the cathode area includes a central area and a peripheral area, the peripheral area extending to lateral edges of the cathode, the central area includes hydrophilic portions and hydrophobic portions, the peripheral area includes hydrophilic portions and hydrophobic portions, and the central area is more hydrophobic than the peripheral area.

Abstract: A fuel cell system optimizing the ratio of width of a channel to a width of a rib forming a passage for supplying fuel and air, the ratio of width thereof to a height of a channel, and the number of passages, thereby improving the fuel diffusing performance and reducing a pressure drop therein is provided. The fuel cell system includes at least one stack for generating electrical energy by an electrochemical reaction between hydrogen and oxygen, a fuel supply portion for supplying fuel to the stack, and an oxygen supply portion for supplying oxygen to the stack. The stack is formed into a stacked configuration having a plurality of membrane electrode assemblies separated by separators. The separators have ribs which closely contact the adjacent membrane electrode assemblies and form channels through which the oxygen and hydrogen flow. The ratio of the width of a channel to the height of the same is between about 0.6 and about 0.8.

Abstract: The present invention relates to a binder composition for a fuel cell including a proton conductor and one or more binders selected from the group consisting of poly[2,2?-(m-phenylene)-5,5?-bibenzimidazole] (PBI), poly[2,5-benzimidazole] (ABPBI), polybenzoxazole (PBO), and polybenzothiazole (PBT).

Abstract: An electrode substrate for a fuel cell including a diffusion layer, a first microporous layer that embeds into the diffusion layer, with the first microporous layer having a thickness in the range of 10 to 30 ?m, and a second microporous layer that forms a boundary with the diffusion layer on the surface of the first microporous layer. The electrode substrate has improved performance such as increased diffusion properties of a fuel or an oxidant, increased properties of releasing moisture, and enhanced electron conductivity.

Abstract: A polymer represented by the following Formula 1, and a membrane-electrode assembly and a fuel cell system including the polymer: In the above Formula 1, definitions of the substituents are the same as in described in the detailed description.

Abstract: The present invention provides a fuel cell system that includes a stack that has at least one electricity generating unit that generates electricity through a reaction between hydrogen and oxygen, a fuel supplier that provides fuel containing hydrogen to the electricity generating unit, an air supplier that provides air to the electricity generating unit, and an insulating unit that surrounds exposed outer surfaces of the stack.

Abstract: A plasma etching chamber of a plasma etching apparatus used in an etching process for manufacturing a photomask and a method for manufacturing a photomask using the same. The plasma etching chamber includes an electrode having a supporting surface for supporting a photomask substrate and a top surface surrounding the supporting surface, a heat transfer element installed along a peripheral edge of the supporting surface, and a heater for supplying heat to the heat transfer element. In the method for manufacturing a photomask, a shading layer is formed on a transparent substrate. A photoresist layer pattern is formed on the shading layer to partially expose the shading layer. The shading layer is etched to form a shading layer pattern, using plasma with the photoresist layer pattern as an etching mask, under a state in which the temperature of at least one portion of the peripheral edge of the transparent substrate is maintained higher than a temperature at a center of the transparent substrate.

Abstract: A fuel cell system includes a reformer for generating hydrogen gas from fuel containing hydrogen using a chemical catalytic reaction and thermal energy. At least one electricity generator generates electrical energy by an electrochemical reaction of the hydrogen gas and oxygen. A fuel supply assembly supplies fuel to the reformer, and an oxygen supply assembly supplies oxygen to the at least one electricity generator. A heat exchanger is connected to the reformer and to the at least one electricity generator. The heat exchanger supplies thermal energy of the reformer, during initial operation of the system, to the at least one electricity generator so as to pre-heat the at least one electricity generator.

Abstract: An electrode substrate for a fuel cell including a diffusion layer, a first microporous layer that embeds into the diffusion layer, with the first microporous layer having a thickness in the range of 10 to 30 ?m, and a second microporous layer that forms a boundary with the diffusion layer on the surface of the first microporous layer. The electrode substrate has improved performance such as increased diffusion properties of a fuel or an oxidant, increased properties of releasing moisture, and enhanced electron conductivity.

Abstract: A fuel cell system includes a reformer for generating hydrogen gas from fuel containing hydrogen using a chemical catalytic reaction and thermal energy. At least one electricity generator generates electrical energy by an electrochemical reaction of the hydrogen gas and oxygen. A fuel supply assembly supplies fuel to the reformer, and an oxygen supply assembly supplies oxygen to the at least one electricity generator. A heat exchanger is connected to the reformer and to the at least one electricity generator. The heat exchanger supplies thermal energy of the reformer, during initial operation of the system, to the at least one electricity generator so as to pre-heat the at least one electricity generator.

Abstract: A photo mask for use in forming a pattern, such as a photoresist pattern, is corrected to compensate for discrepancies in the transmissivity of the photo mask which results in the pattern having a distribution of critical dimensions that is too great or which deviates too much from the target critical dimension of the pattern. The photo mask includes a transparent substrate, a light-shielding layer pattern defining transmission sites on the transparent substrate, and at least some of which sites have a relatively low transmissivity. The method of correcting the photo mask includes doping a front surface of the transparent substrate of the photo mask with ions. A predetermined number of the sites can be doped to narrow the distribution of the critical dimensions of the pattern formed using the photo mask, or all of the transmission sites of the photo mask can be doped to make the average of the critical dimensions of the pattern closer to the target critical dimension of the pattern.

Abstract: A fuel cell system includes a stack having an electricity generator for receiving fuel and air to generate electrical energy, a fuel supply unit for supplying the fuel to the stack, a housing in which the stack is mounted, a fan unit for supplying external air to the interior of the housing for cooling the electricity generator, and a region wherein air heated while cooling the electricity generator and air discharged from the stack and containing moisture are mixed. The air that is mixed in the region is discharged from the region.

Abstract: A composite material for a bipolar plate of fuel cells is comprised of conductive carbon dispersed in polybenzoxazine matrix. The present invention also provides a composite material for preparing a bipolar plate for fuel cells comprising a polymer where a volume reduction percent is less than 5%, preferably 3%, and more preferably 1% after polymerization of the monomers with respect to total volume of the monomers before the polymerization thereof, and conductive carbon. The polymers of the present invention have good workability since there is little volume change during polymerization, and good mechanical and chemical properties, and they can be manufactured at a low cost.

Abstract: A cooling apparatus of a fuel cell system includes a housing for providing a space for receiving an electricity generating unit and a cooling medium supply unit connected to the housing to supply the cooling medium to the electricity generating unit. The housing has a body having a space for receiving the electricity generating unit. A guide section is connected to the body to collect the cooling medium passing through electricity generating unit. An exhaust unit is connected to the guide section to exhaust the cooling medium to outside of the housing.

Abstract: Provided are a dye-sensitized solar cell and a method of manufacturing the same. The dye-sensitized solar cell includes an opposing electrode and a photoelectrode. The opposing electrode includes a light-transmitting layer formed of a transparent glass substrate and an FTO (fluorine-doped tin oxide) thin film deposited on the transparent glass substrate, and a catalyst layer formed by depositing platinum on the FTO thin film. The photoelectrode includes a glass substrate and an FTO thin film deposited on the glass substrate. The photoelectrode is coated with a mixture of a fluorescent material and a transition metal oxide that includes titanium dioxide (TiO2) to thereby be adsorbed with a dye. An electrolyte is filled between the opposing electrode and the photoelectrode.

Abstract: A method for preparing poly(2,5-benzimidazole) whereby 3,4-diaminobenzoic acid is polymerized using a dehydrating reagent containing P2O5 and CX3SO3H where X is H or F. The poly(2,5-benzimidazole) has good proton conductivity and low methanol permeability, and therefore can be used as a polymer electrolyte membrane for a fuel cell.

Abstract: A plasma etching chamber of a plasma etching apparatus used in an etching process for manufacturing a photomask and a method for manufacturing a photomask using the same. The plasma etching chamber includes an electrode having a supporting surface for supporting a photomask substrate and a top surface surrounding the supporting surface, a heat transfer element installed along a peripheral edge of the supporting surface, and a heater for supplying heat to the heat transfer element. In the method for manufacturing a photomask, a shading layer is formed on a transparent substrate. A photoresist layer pattern is formed on the shading layer to partially expose the shading layer. The shading layer is etched to form a shading layer pattern, using plasma with the photoresist layer pattern as an etching mask, under a state in which the temperature of at least one portion of the peripheral edge of the transparent substrate is maintained higher than a temperature at a center of the transparent substrate.