Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Norihira Uozumi

Koji Amakawa

Yasuyuki Tsutsumi

Kazuaki Oishi

Motoo Yamaguchi

Takahide Matsuo

Saburo Yasukawa

Takeo Yamagata

Atsushi Miki

Yoshiyuki Kubota

Kozin Abe

Kenzo Kobayashi

Seiichiro Ono

A method for producing a supported metallic catalyst capable of increasing the number of active points in the metallic catalyst supported at surface of a supporter and of using with high activity and stability, wherein metallic particles in a form of ions or atomic particles composed of several atoms are generated by an ion injecting apparatus, the metallic particles are collided, adsorbed, and supported by the supporter, and the supported metallic catalyst is made by manufacturing the adsorbing sites, and by adsorbing and supporting the metallic catalyst, concurrently.

Supported metallic catalyst and manufacturing method thereof

An electrolyte-type fuel cell, i.e., a fuel cell using a liquid electrolyte, which comprises at least one unit cell comprising a matrix for retaining a liquid electrolyte and a pair of gas diffusible electrodes each having a gas flow passage and provided at both sides of the matrix and in direct contact with the matrix, and a pair of gas supply-discharge means for supplying and discharging a necessary gas to and from the gas passages of the corresponding gas-diffusible electrodes of the unit cell, at least one of the gas passages of the gas-diffusible electrodes being communicated with the matrix through at least one liquid electrolyte passage, at least one demister being provided in the gas flow passage and on the liquid electrolyte passage exposed in the gas flow passage, and a means for generating electrolyte mists being provided at the supplying side of at least one of the gas supply-discharge means can supply a liquid electrolyte to the matrix with a high trapping efficiency of liquid electrolyte mists.

Fuel cell using liquid electrolyte

A fuel cell for generating electricity by reaction of reacting gases through a catalyst, which comprises a pair of electrodes each having a gas passage and being made from a porous substrate, an electrolyte-retaining matrix provided between the electrodes, and a pair of separator plates for partitioning the cells at the outer ends, one electrode in which a gas is formed by reaction of the reacting gases, among the pair of electrodes, having a catalyst layer and an independent gas inflow passage and an independent gas outflow passage as the gas passage and the reacting gas supplied from the gas inflow passage being passed through the electrode and the catalyst layer to the gas outflow passage as accompanied with the gas formed by the reaction of the reacting gas through the catalyst layer has a good diffusion of a reacting substance through the electrode and an improved electrode performance.

Fuel cell

A fuel cell comprises unit cells stacked through separators therebetween; each unit cell comprising a fuel electrode plate, an oxidizing agent electrode plate and a matrix between electrode plate and the oxidizing agent plate, U-shaped gas flow passages for the fuel electrode and for the oxidizing agent electrode are provided in a counter-current relation to each other with gas inlets and gas outlets for the fuel electrode and the gas inlets and the gas outlets for the oxidizing agent electrodes being provided at the opposite sides of the fuel cell, respectively, and communicated respectively with manifolds at the same opposite sides of the fuel cell. The fuel cell is simple in structure, highly reliable in fabrication, operation and maintenance, and high in gas utilization efficiency.

In a gas-insulated electric apparatus, such as a gas-insulated switchgear and a gas-insulated bus, having an insulating-gas-filled metallic container or sheath within which an electric conductor carrying a high-voltage current is supported by an insulating supporter, a potential detected by a first potential detector through at least a portion of the insulating supporter and another potential detected as a reference value by a second potential detector through an electro-static capacity disposed between the metallic container and the second potential detector are fed to the inputs of a differential amplifier of a partial discharge detecting device to thereby detect possible partial discharges along the insulating supporter with high sensitivity.

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Hitachi, Japan

Norihira Uozumi