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: A billing system based on radon concentration pattern analysis and a method therefor is provided, the system including a radon detection device counting the output alpha particle detection signals for a predetermined measurement time to calculate a radon concentration value; and a cloud server storing generating a radon concentration pattern corresponding to the radon detection device by using a radon concentration value received from the radon detection device and calculating a cost for radon monitoring service provided to a terminal of the user, wherein the cloud server analyzes the generated radon concentration pattern and determines the periodic behavior pattern of the user for a predetermined period of time, whereby it is possible to charge a radon monitoring service fee for each user using the radon monitoring service, and the user may be motivated to frequently perform the ventilation action that reduces the radon concentration.

Abstract: A method for manufacturing a unit cell for a fuel cell includes preparing a separator having a reaction area located to correspond to an anode or a cathode of the unit cell, a first protrusion protruding from the separator, and a second protrusion spaced apart from the first protrusion with the reaction area interposed therebetween. The method includes providing a passage configured to guide a reaction gas to flow in the reaction area, and arranging a porous passage having a height protruding to become farther away from the separator and to be higher than the first and second protrusions between the first and second protrusions in parallel. The method includes compressing the porous passage toward the separator. The porous passage is fixed to the separator via the first and second protrusions by a force applied between the porous passage and the protrusion as the passage is deformed or is apt to be deformed to be lengthened in a transverse direction due to the compression of the porous passage.

Abstract: Provided are a core for a current transformer and a manufacturing method for the same in which high permittivity is formed in order to optimize electric power acquisition efficiency by magnetic induction at a low current. The provided method of manufacturing a core through the steps of winding a metal ribbon, heat treating a core base, impregnating, cutting and polishing, wherein after the core base which is inserted into a mold is heat treated to implement a shape, the core base separated from the mold is heat treated to manufacture the core for the current transformer having high permittivity.

Abstract: Disclosed is a method of manufacturing an electrolyte membrane including an antioxidant. The method may include forming a first dispersion liquid including deionized water, a first ionomer dispersion solution and an antioxidant, and forming a second dispersion liquid including the first dispersion liquid and a second ionomer dispersion solution.

Abstract: Disclosed are an antioxidant which increases chemical durability of a polymer electrolyte membrane fuel cell (PEMFC) and a method for manufacturing the same. The antioxidant may prevent chemical degradation of the fuel cell and have improved antioxidation capability through a reduction reaction annealing process.

Abstract: Disclosed are an antioxidant for fuel cells and a membrane-electrode assembly including the same. The membrane-electrode assembly may have obtained greatly improved durability by using an antioxidant having a novel composition that may provide excellent antioxidant activity and long-term durability.

Abstract: A separator for a fuel cell includes a channel having a passage that is a flow path of a reaction gas, a manifold part formed at a peripheral of the channel and communicating with the passage such that the reaction gas is introduced into and discharged from the channel, and a connector connecting the channel and the manifold part such that the reaction gas flows between the channel and the manifold part. The manifold part includes an inlet manifold through which the reaction gas is introduced into the channel and formed at a lower portion of the channel, and an outlet manifold configured to discharge the reaction gas from the channel to an outside of the fuel cell and formed at an upper portion of the channel.

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: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x?n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: Disclosed are a membrane electrode assembly with a sub-gasket and a manufacturing method thereof. The membrane electrode assembly includes an electrolyte membrane, the sub-gasket formed in an edge region of the electrolyte membrane to surround a central region of the electrolyte membrane, and an adhesive layer formed between the electrolyte membrane and the sub-gasket and including an adhesive material and an antioxidant. The electrolyte membrane is formed to have a flat surface in a first direction, the sub-gasket extends in the first direction and a second direction vertical to the first direction, and the antioxidant includes a metal salt hydrate.

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: 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: An inspection apparatus of an electrolyte membrane is provided. The apparatus includes a lower supporter having a gas line through which gas flows or a concave portion that stores the gas. An upper supporter is disposed at an upper side of the lower supporter, and includes an opening. A membrane-electrode assembly is disposed between the lower supporter and the upper supporter. An upper cover covers an upper portion of the opening, and is formed with a plurality of partitions. An exhaust port is formed at the upper supporter to exhaust deionized water.

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: 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: 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: Disclosed is a core for a current transformer, which forms an upper core in a round shape, and is disposed at a position lower than the center of a power line having both ends of the upper core received, thereby minimizing the stress of a magnetic path, and increases the permeability, thereby enhancing the magnetic induction efficiency. The disclosed core for the current transformer includes an upper core curved in a semi-circular shape to have a receiving groove formed therein, and having both ends extended downwards to be disposed to be spaced apart from each other and a lower core disposed on the lower portion of the upper core, and having both ends extended upwards to be disposed to face both ends of the upper core.

Abstract: An inspection apparatus of an electrolyte membrane is provided. The apparatus includes a lower supporter having a gas line through which gas flows or a concave portion that stores the gas. An upper supporter is disposed at an upper side of the lower supporter, and includes an opening. A membrane-electrode assembly is disposed between the lower supporter and the upper supporter. An upper cover covers an upper portion of the opening, and is formed with a plurality of partitions. An exhaust port is formed at the upper supporter to exhaust deionized water.

Abstract: Disclosed in an alpha particle detection apparatus using a dual probe structured ionization chamber and a differential amplifier, the apparatus including: an ionization chamber forming electric field thereinside by bias power applied to a surface thereof; a main probe unit absorbing ionic charges generated in an occurrence of alpha (?) decay in the ionization chamber; a guard ring unit absorbing leakage current generated between the ionization chamber and the main probe unit and flowing the leakage current to a ground; an auxiliary probe allowing surrounding noise to be introduced therein; first and second preamplifiers amplifying fine electrical signals to a predetermined magnitude; and a differential canceling a noise signal and outputting an alpha particle detection signal by amplifying a voltage difference between the preamplified electrical signals. As such, it is possible to effectively detect alpha (?) particles which are a type of radiation.