Abstract: Disclosed are a catalyst composite for a fuel cell and a method of manufacturing the same. The catalyst composite includes a support containing carbon (C), a metal catalyst supported on the support, and an ionomer binder coated on the surface of the support and on the surface of the metal catalyst. The ionomer binder coated on the surface of the metal catalyst is formed so as to be thinner than the ionomer binder coated on the surface of the support.

Abstract: The present invention provides a fuel cell stack with enhanced freeze-thaw durability. In particular, the fuel cell stack includes a gas diffusion layer between a membrane-electrode assembly and a bipolar plate. The gas diffusion layer has a structure that reduces contact resistance in a fuel cell and is cut at a certain angle such that the machine direction (high stiffness direction) of GDL roll is not in parallel with the major flow field direction of the bipolar plate, resulting in an increased GDL stiffness in a width direction perpendicular to a major flow field direction of a bipolar plate.

Abstract: A fuel cell system and a control method thereof are provided. In the system, an oxygen sensor is mounted on the anode inlet side and the anode outlet side of a fuel cell stack to measure an oxygen concentration. Based on the measured oxygen concentration, a control operation is performed on the fuel cell system to reduce the oxygen concentration on the anode side. Accordingly, the irreversible deterioration of the fuel cell occurring due to the reverse voltage of the cell during driving of the fuel cell vehicle and the cathode carbon corrosion occurring due to the inflow of air during parking are effectively reduced, thereby increasing the durability of the fuel cell and the fuel cell vehicle.

Abstract: Disclosed are a membrane-electrode assembly for fuel cells having improved durability and a manufacturing method thereof. Hydrogen peroxide, from which a hydroxyl radical is generated, may be removed using an antioxidant having the structure A1-aA?aBO3-?and including strontium or samarium, thereby improving the durability of an electrolyte membrane and an electrode.

Abstract: Disclosed is an antioxidant for an electrolyte membrane of fuel cells. The antioxidant may include a support including silicon dioxide and having a nanotube shape, and a metal oxide supported on the support.

Abstract: A gas diffusion layer (GDL) for fuel cell applications that can prevented channels of a bipolar plate from being intruded. The gas diffusion layer is manufactured by cutting a GDL material at a certain angle such that a machine direction of the inherent high stiffness of the GDL material is not in parallel with a major flow field direction of a bipolar plate to prevent the GDL intrusion into the channels of the bipolar plate without modifying an existing method for manufacturing the gas diffusion layer. With the gas diffusion layer, the electrochemical performance of the fuel cell can be improved and manufacturing process can be improved even in the case where the width of the rolled GDL material is small.

Abstract: A method for improving freezing resistance of a membrane electrode assembly is provided. In particular, the method improves freezing resistance of a membrane electrode assembly including conducting drying and heat treatment under certain conditions to produce an electrode that reduces formation of macro-cracks and micro-cracks in the electrode. Accordingly, water does not permeate the electrode excessively and the electrode does not break even when frozen.

Abstract: Disclosed is a method of manufacturing an electrolyte membrane for fuel cells. The method includes preparing an electrolyte layer including one or more ion conductive polymers that form a proton movement channel, and permeating a gas from a first surface of the electrolyte layer to a second surface of the electrolyte layer.

Abstract: Disclosed are an antioxidant for polymer electrolyte membrane fuel cells including barium cerium oxide and one or more rare-earth elements and having a Perovskite structure, an electrolyte membrane and the membrane-electrode assembly for vehicles including the antioxidant. The antioxidant for polymer electrolyte membrane fuel cells according to the present invention can improve antioxidant activity and long-term stability of electrolyte membranes and enhance durability of fuel cells.

Abstract: Described herein is a composition for manufacturing an electrode of a membrane-electrode assembly for fuel cells and a method for manufacturing an electrode of a membrane-electrode assembly for fuel cells including the same. More particularly, described herein is a composition for manufacturing an electrode of a membrane-electrode assembly for fuel cells which can improve porosity in the electrode and thereby mass transport capability of reactive gases by mixing a second carbon having lower crystallinity than a first carbon to produce an electrode and applying a voltage to the electrode to remove only the second carbon, and a method for manufacturing an electrode of a membrane-electrode assembly for fuel cells including the same.

Abstract: A gas diffusion layer (GDL) for fuel cell applications that can prevented channels of a bipolar plate from being intruded. The gas diffusion layer is manufactured by cutting a GDL material at a certain angle such that a machine direction of the inherent high stiffness of the GDL material is not in parallel with a major flow field direction of a bipolar plate to prevent the GDL intrusion into the channels of the bipolar plate without modifying an existing method for manufacturing the gas diffusion layer. With the gas diffusion layer, the electrochemical performance of the fuel cell can be improved and manufacturing process can be improved even in the case where the width of the rolled GDL material is small.

Abstract: The present invention relates to a method of manufacturing an electrolyte membrane for fuel cells by transferring antioxidants to the electrolyte membrane. The method may include providing a first membrane including a perfluorinated sulfonic acid-based compound, providing a second membrane including an antioxidant such that the second membrane partially or entirely contacts a surface of the first membrane, transferring or moving the antioxidant of the second membrane to the first membrane, and removing the second membrane.

Abstract: Disclosed are a membrane-electrode assembly for fuel cells with improved durability and a polymer electrolyte membrane fuel cell including the same. The membrane-electrode assembly includes an antioxidant, Sm-doped cerium oxide in the electrolyte membrane, which has a controlled microstructure through high-temperature heat treatment, thereby providing both superior antioxidant activity and excellent long-term stability.

Abstract: The present invention provides a porous medium with increased hydrophobicity and a method of manufacturing the same, in which a micro-nano dual structure is provided by forming nanoprotrusions with a high aspect ratio by performing plasma etching on the surface of a porous medium with a micrometer-scale surface roughness and a hydrophobic thin film is deposited on the surface of the micro-nano dual structure, thus significantly increasing hydrophobicity. When this highly hydrophobic porous medium is used as a gas diffusion layer of a fuel cell, it is possible to efficiently discharge water produced during electrochemical reaction of the fuel cell, thus preventing flooding in the fuel cell. Moreover, it is possible to sufficiently supply reactant gases such as hydrogen and air (oxygen) to a membrane electrode assembly (MEA), thus improving the performance of the fuel cell.

Abstract: An apparatus for measuring micro-cracks in a membrane electrode assembly includes a resistance measurement unit to measure variation in electrical resistance of the membrane electrode assembly while tensioning the membrane electrode assembly in a state in which power is applied to an upper catalyst layer while a lower catalyst layer is insulated, an image capture unit to capture an image of micro-cracks in the upper catalyst layer while the membrane electrode assembly is being tensioned, and a controller to detect, in real time, variation in electrical resistance measured by the resistance measurement unit, corresponding to the image of micro-cracks captured by the image capture unit, and to interpret the size of the micro-cracks generated in the membrane electrode assembly based on the detected variation in electrical resistance.

Abstract: A membrane-electrode assembly (MEA) for fuel cells includes an electricity-generating array including an anode, a cathode, and an electrolyte membrane. A subgasket array includes an anode subgasket surrounding a periphery of the anode and a cathode subgasket surrounding a periphery of the cathode. A junction array includes a polar junction and a nonpolar junction surrounding a periphery of the electrolyte membrane and attaching the anode subgasket and the cathode subgasket to each other.

Abstract: Disclosed are a process for separating an electrode for membrane-electrode assemblies of fuel cells from the decal transfer film and an apparatus for separating the electrode. In particular, during the electrode separating process, only an electrode is separated from the decal transfer film on which the electrode is coated, without any damage, by a freezing method for freezing the specimen on the deionized water surface, and thus, wasting the expensive MEA is prevented. Thus, mechanical properties of the pristine electrode can be rapidly quantified in advance, and therefore, long term durability evaluation period during developing MEA having excellent durability is substantially reduced.

Abstract: A method for improving freezing resistance of a membrane electrode assembly is provided. In particular, the method improves freezing resistance of a membrane electrode assembly including conducting drying and heat treatment under certain conditions to produce an electrode that reduces formation of macro-cracks and micro-cracks in the electrode. Accordingly, water does not permeate the electrode excessively and the electrode does not break even when frozen.

Abstract: A membrane electrode assembly includes: an electrolyte membrane; a cathode and an anode, each being stacked on the electrolyte membrane; and subgaskets bonded to a peripheral region of the electrolyte membrane, which is outside an active area, in which each of the cathode and the anode are stacked on the electrolyte membrane. The electrolyte membrane is disposed in at least a portion of the peripheral region of the electrolyte membrane, which is outside the active area, with a water discharge blocking region for preventing water in the electrolyte membrane from diffusing and being discharged to outside.

Abstract: Disclosed are a process for separating an electrode for membrane-electrode assemblies of fuel cells from the decal transfer film and an apparatus for separating the electrode. In particular, during the electrode separating process, only an electrode is separated from the decal transfer film on which the electrode is coated, without any damage, by a freezing method for freezing the specimen on the deionized water surface, and thus, wasting the expensive MEA is prevented. Thus, mechanical properties of the pristine electrode can be rapidly quantified in advance, and therefore, long term durability evaluation period during developing MEA having excellent durability is substantially reduced.