Abstract: The present invention relates to a composite electrolyte membrane for fuel cells that has high proton conductivity and low fuel permeability even under low humidity conditions and at elevated temperatures. The membrane, comprising a cation exchange resin and acid-treated dendrimers, has great utility in large and medium fuel cells for applications in household appliances, electric vehicles, etc.

Abstract: Disclosed is a structure for improving a laminating efficiency of a metal-separator for a fuel cell stack, the metal-separator comprising an embossed structure that has an indentation and a projection alternately formed along at least one edge thereof so as to enable a plurality of the metal-separators to be stably laminated in a honeycomb shape.

Abstract: The present invention provides a heating-pressurizing jig for manufacturing a 5-layer membrane electrode assembly (MEA), in which: metal plates are formed integrally with heating plates to obviate the difficulty in increasing the temperature of the metal plates to a normal state every time when manufacturing a plurality of 5-layer MEAs; an MEA is mounted to external guides while being spaced apart from lower guides at predetermined intervals to prevent the MEA from being dried, contracted and deformed by the heated metal plates; and the lower guides and upper plate supports are elastically supported by springs, respectively, so that the external guides can respond in real time to the change in the thickness caused when upper and lower gas diffusion layers are compressed, thus preventing the MEA from being bent.

Abstract: A separating plate for a fuel cell includes first and second plates, each provided with a hydrogen channel, an oxygen channel, and a coolant channel. The first and second plates are attached to one another to form a main plate such that the first and second hydrogen, oxygen, and coolant channels compose main hydrogen, oxygen, and coolant channels, respectively. The main hydrogen and oxygen channels are fluidly isolated from each other. Distal ends of the main channels each communicate with a manifold through a communication passageway configured to supply hydrogen, oxygen, or coolant to a corresponding one of the main channels.

Abstract: Disclosed is a structure for improving a laminating efficiency of a metal-separator for a fuel cell stack, the metal-separator comprising an embossed structure that has an indentation and a projection alternately formed along at least one edge thereof so as to enable a plurality of the metal-separators to be stably laminated in a honeycomb shape.

Abstract: The present invention provides materials and methods for making proton conductive polymer, polymer membranes comprising the proton conductive polymer, membrane-electrode assemblies comprising the polymer membrane, and fuel cells comprising the membrane-electrode assemblies. The proton conductive polymer can be formed in the following manner: a) silicon inorganic polymers and silane compounds having amino groups are dissolved in a solvent to form a precursor; b) said precursor undergoes condensation polymerization to form a network of inorganic polymers; and c) the network and a reactant are contacted with one another to form the proton conductive polymer.