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: Disclosed is a fuel cartridge. The fuel cartridge according to the present disclosure comprises a fuel container having a first port configured to flow fuel therethrough; and a buffer module configured to be coupled to the fuel container, wherein the buffer module comprises a second port configured to engage with the first port, a tubing connection comprising a first and a second end, wherein the first end is coupled to or forms the second port, a third port coupled to or formed by the second end of the tubing connection, and a buffer container in fluid communication with the second and third ports via the tubing connection, wherein the buffer container is configured to store fuel therein when an inflow of the fuel to the buffer module is greater than an outflow from the buffer module.

Abstract: A planar fuel cell stack, having generators that generate electricity by an electrochemical reaction of a fuel and an oxidizing agent, the generators arranged on a same plane. A beading unit and a protruding portion are formed on a fastening plate and a separator so as to improve structural stiffness thereof. Accordingly, the constituent elements of the stack are fastened with a substantially uniform conjoining pressure compared to a conventional planar stack, and the thickness of the stack of the present invention can be thinner than that of the conventional planar stack.

Abstract: An air-breathing fuel cell stack including: a membrane electrode assembly that includes an anode, a cathode, and an electrolyte disposed therebetween; a fuel supplier coupled to the anode, to supply fuel to the anode; a cathode current collector coupled to the cathode; a cathode end plate to support the cathode current collector; and a filter positioned between the cathode current collector and the cathode end plate, to control the moisture content of the membrane electrode assembly.

Abstract: An end plate of an air breathing fuel cell stack and an air breathing fuel cell stack including the same. The air breathing fuel cell stack includes a membrane electrode assembly, including an anode electrode, a cathode electrode, and an electrolyte positioned between the anode electrode and the cathode electrode; and an end plate contacting the membrane electrode assembly. The end plate includes a first surface contacting the membrane electrode assembly, an opposing second surface; and a collector positioned at the first surface and contacting the cathode electrode.

Abstract: A cathode end plate for a breathable fuel cell stack including a first plate including a plurality of first openings and a second plate contacting one side of the first plate and including a plurality of second openings exposing two or more first openings of the plurality of first openings.

Abstract: A fuel cell stack includes a membrane electrode assembly including an anode electrode, a cathode electrode, and an electrolyte membrane positioned between the anode electrode and the cathode electrode; a separator including a channel for a flow of fuel and oxidant and closely adhered to the membrane electrode assembly; and a gasket with a two-layer structure stacked between the separator and the membrane electrode assembly.

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: Disclosed is a fuel cell system wherein the flow of fuel and oxygen is optimized thereby improving the thermal efficiency of the entire system. The fuel cell system comprises at least one stack for generating electrical energy by an electrochemical reaction between hydrogen gas 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 in a stacked configuration with MEAs and separators. The separators are positioned on either surface of the MEAs. The separators have a plurality of ribs proximate to the MEAs which define a plurality of channels wherein the ratio of a width of the channels to the width of the ribs is from about 0.8 to 1.5.

Abstract: A method for preparing sulfonated polystyrene, whereby a styrene monomer having a sulfonyl chloride is prepared by reacting p-styrene sulfonic acid salt with a chloride, a styrene-based polymer having the sulfonyl chloride is synthesized by the polymerization of a p-styrene sulfonyl chloride monomer and optionally at least one monomer of a styrene and an acrylic monomer, the styrene-based polymer having the sulfonyl chloride is treated with an inorganic base aqueous solution to change the sulfonyl chloride into a SO3M group where M is an alkali metal, and treated with an acidic aqueous solution to prepare a styrene-based polymer having a sulfonic acid group. The styrene-based polymer having the sulfonic acid group prepared according to the process of the present invention has high proton conductivity and good mechanical properties.

Abstract: A fuel cell system having an electricity generator that generates electricity by the electrochemical reaction between hydrogen and oxygen. The electricity generator includes a membrane electrode assembly with a conductive polymer membrane, and anode and cathode electrode layers on opposite sides of the conductive polymer membrane. The electricity generator has a pair of separator plates facing the anode and cathode electrode layers of the membrane electrode assembly and having channels through which flow hydrogen containing fuel or oxygen containing gas. There is also a pair of gaskets provided on opposite sides of the ionic conductive polymer to enclose each edge of the anode and cathode electrodes so that fluid leakage is prevented between the ionic conductive polymer membrane and the separator plates, wherein at least one of the gaskets is used as a voltage measuring gasket including a nonconductive first frame and a conductive second frame.

Abstract: A fuel cell is provided. The fuel cell includes a medium member. Unit areas are formed at both sides of the medium member. The unit areas include outlets and inlets which allow a fuel to flow. First path members which have first flowpaths for circulating the fuel are disposed at the unit areas. Membrane-electrode assemblies are connected to the respective first path members. Second path members which have second flowpaths for circulating air are connected to the respective membrane-electrode assemblies.

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: The invention relates to an electrode for a fuel cell and a fuel cell comprising the same. The electrode includes a catalyst layer formed on a diffusion layer comprising conductive powders, fluorinated resins, and conductive substrates.

Abstract: A fuel cell system including: at least one electricity generator for generating electric energy through a reaction between fuel and oxygen and for discharging the remaining fuel; a fuel supply unit for supplying a predetermined amount of fuel to the electricity generator; an oxygen supply unit for supplying oxygen to the electricity generator; a valve unit which is connected to a fuel discharger of the electricity generator and which adjusts a fuel pressure in the electricity generator; a sensor unit which is disposed in the electricity generator and which senses an output amount of electricity of the electricity generator; and a control unit which converts a sensed signal from the sensor unit into a predetermined control signal and which controls the valve unit with the predetermined control signal.

Abstract: The present invention relates to an electrode for a fuel cell containing a catalyst layer, a gas diffusion layer including a conductive substrate, and a micro-porous layer interposed between the catalyst layer and the gas diffusion layer and including a conductive material and a dispersant.

Abstract: The present invention relates to an electrode for a fuel cell including a catalyst layer, a gas diffusion layer including a conductive substrate, and a micro-porous layer interposed between the catalyst layer and the gas diffusion layer and including a conductive material and a thickener.

Abstract: A reformer for a fuel cell system has at least a dual pipe configuration that forms independent spaces through which fuel containing hydrogen passes. The reformer includes a first reaction assembly for generating heat energy by an oxidation reaction of the fuel and a second reaction assembly for generating hydrogen gas from the fuel through a reforming reaction using the heat energy. The reformer further includes a first pipe, and a second pipe having a circumference significantly less than a circumference of the first pipe to thereby allow for positioning of the second pipe within the first pipe. An oxidation catalyst layer is formed in the second pipe, and a reforming catalyst layer is formed between the first pipe and the second pipe.