Tanaka Kikinzoku Kogyo K.k.

Other

Stonehart Associates Inc.

Citizen Electronics Co., Ltd.

Masahiro Watanabe

Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Panasonic Holdings Corporation

University of Yamanashi

National University Corporation University of Yamanashi

Noriaki Hara

Kazunori Tsurumi

Shingo Kuriki

Paul Stonehart

Kazuki Matsumura

Nagakazu Furuya

Koichi Sakairi

Hiroyuki Uchida

Kenji Miyatake

Katsuyoshi Kakinuma

Toshihide Nakamura

Satoshi Motoo

Nobuo Yamamoto

Yuji Omori

Hisao Yamashita

Atsushi Taniguchi

You Otaki

Yumi Yamamoto

Natsuko Motoo, Executor

Satoshi Motoo, Deceased

Yoshitomi Onoda

Makoto Uchida

Light emitting diode

Light-emitting diode

We have recently proposed special catalysts, Pt-supported zeolites, for the selective oxidation of carbon monoxide in reformed fuels from methanol or natural gas. They can be applied to polymer electrolyte fuel cells, of which Pt anode catalysts suffer serious poisoning by the trace amount of CO. In order to enhance the performance of the catalysts, the selective CO oxidation was examined over Pt&mdash;, Ru&mdash;, Pd&mdash;, Co&mdash;, and PtRu&mdash; supported zeolites in a large excess of H,with the addition of a low concentration of oxygen. It was found that Pt, Ru, and PtRu supported on mordenite can oxidize CO much more selectively than a conventional Pt-supported alumina catalyst. Ru/mordenite showed the highest selectivity of approximately 100% at 200&deg; C. with a certain flow rate of the reactant. Pt-Ru/mordenite exhibited fairly high selectivity of 90% over a wide flow rate condition even at 150&deg; C. Analyses with IR and QCM methods indicated that the selective CO oxidation on Pt&mdash;Ru/mordenite can proceed by so-called bi-functional mechanism via the surface reaction between CO and O atoms adsorbed on adjacent Pt and Ru sites.

Process for the selective oxidation of carbon monoxide in reformed gases

Disclosed is an anode electrocatalyst for a fuel cell comprising an alloy essentially consisting of at least one of tin, germanium and molybdenum, and one or more noble metals selected from platinum, palladium and ruthenium. The tin, germanium and/or molybdenum gas the ability of depressing the poisioning of the noble metal with carbon monoxide so that fuel containing a relatively high content of the carbon monoxide may be supplied to a fuel cell equipped with anode in accordance with the present invention which is otherwise liable to be poisioned.

Anode electrocatalyst for fuel cell and process of preparing same

Disclosed is a process of preparing fluorinated material which comprises thermally treating the mixture of carbon black and hydrocarbon polymer compound powder for covering the surface of the carbon black with the latter and fluorinating the hydrocarbon polymer compound. The thermal treatment can be conducted in two stages. The fluorinated material prepared in accordance with the present invention can provide much more pore volumes acting as gas networks in, for example, an electrode which exhibits high gas permeability or gas supplying ability. Further, the hydrophobicity is as high as that of the material prepared in accordance with mixing carbon black with hydrocarbon polymer compound dispersed in an organic solvent, and is higher than that of the conventional mixture of carbon black and polytetrafluoroethylene particles. The fluorinated material is preferably employed to a fuel cell as gas network material.

Process of preparing fluorinated material

Disclosed herein are an fuel cell and/or an electrolytic cell which comprises a plurality of unit cells, and one or more separator plates having one or more anode gas supply grooves and one or more cathode gas supply grooves inserted between two adjacent unit cells, at least part of the anode gas supply grooves and the cathode gas supply grooves being overlapped in the direction of the width of the separator plate, and a process of cooling and/or dehumidifying the fuel cell and/or the electrolytic cell by flowing a reaction gas thereto. The most preferable separator plate is such that the anode gas supply grooves and the cathode gas supply grooves are separated by a thin separator wall made of a metal or an electrocondutive resin.

Fuel cell, electrolytic cell and process of cooling and/or dehumidifying

Disclosed are a gas diffusion electrode for an electrochemical cell which comprises a catalyst layer formed by binding, by means of poiytotrafluoroethylene, catalyst-supporting carbon black and catalyst-non-supporting carbon black having a fluorinated polyolofine film on substantially whole surface, the catalyst layer being integrated on a substrate, and a process of preparing same. Since the carbon black employed for the formation of the gas network in the catalyst layer of the gas diffusion electrode having the above constitution in accordance with the present invention is completely hydrophobically treated, no electrolyte permeates this portion and the carbon black exhibits high hydrophobicity so that the wet-proofing is maintained even after the long operation period to enable the gas supply to the catalyst particles so as to provide the gas diffusion electrode with a long life and high electrode performances.

Gas diffusion electrode for electrochemical cell and process of

Disclosed is a sandwich-type solid polymer electrolyte fuel cell comprising in sequence, a cathode current collector; a cathode electrically connected to the cathode current collector, said cathode containing an ion exchange resin and cathode catalyst particles in electrical communication with the cathode; an ion exchange membrane; an anode containing an ion exchange resin and anode catalyst particles in electrical communication with the anode; and an anode current collector electrically connected to the anode. The cathode and/or anode contain, in the ion exchange resin, catalyst metals capable of promoting the reaction of hydrogen and oxygen gases to produce water. The catalyst metals are insulated electrically from the current collectors due to the presence of the ion exchange resin which has no electrical conductivity.

Sandwich-type solid polymer electrolyte fuel cell

Disclosed herein are process of preparing carbon supports coated with polyolefin or fluorinated polyolefin to be employed as a network substrate of such an electrochemical cell, in these processes, a solvent which solvates the polyolefin is employed for forming polyolefin in the shape of nearly single fibers which are the smallest unit conceivable. The carbon supports coated with the said solvated polyolefin which possesses the maximum uniformity concalvable have the maximum performance when they are employed in a gas diffusion electrode.

Process of preparing carbon support coated with polyolefin and of

Disclosed herein is solid polymer electrolyte composition comprising solid polymer electrolyte and at least one metal catalyst selected from the group consisting of platinum, gold, palladium, rhodium, iridium and ruthenium contained in the said solid polymer electrolyte. The said composition may further contain a metal oxide. The membrane made of the composition possesses the abilities of producing water by itself and of retaining the water so that the ionic conductivity and the effect of depressing the crossover is excellent. Accordingly, the cell employing the membrane possesses superior cell performance.

Solid polymer electrolyte composition

Disclosed an electrode for a polymer electrolyte electrochemical cell which comprises catalyst supports carrying catalyst particles, a first solid polymer electrolyte layer insoluble in water and an organic solvent formed on the particles and a second solid polymer electrolyte layer insoluble or soluble in the organic solvent formed on part of the surface of the first solid polymer electrolyte layer and a process of preparing same.

Electrode for polymer electrolyte electrochemical cell and process of

Disclosed is a structure for wetting a diaphragm of a solid polymer electrolyte fuel cell in which one or more hollow paths are provided in or on the diaphragm for supplying water to the solid polymer electrolyte. According to the structure of this invention, the elevation of performances of the above cell is achieved by wetting the diaphragm at a desired level. Since the water can be supplied through the hollow paths with substantially no resistance, the amount to be supplied can be freely controlled.

Structure for wetting diaphragm of solid polymer electolyte

The polymer solid-electrolyte composition according to the present invention comprises a polymer solid electrolyte selected from the group consisting of perfluorocarbon sulfonic acid, polysulfones, perfluorocarbonic acid, styrene-divinylbenzene sulfonic acid cation-exchange resins and styrene-butadiene anion-exchange resins, and 0.01-50% by weight of fine particle silica and/or fibrous silica fiber relative to the weight of the polymer solid electrolyte.

Polymer solid-electrolyte composition and electrochemical cell using the

Growing community of inventors

Yamanashi, Japan

Masahiro Watanabe