Hitachi, Ltd.

Hitachi Maxell, Limited

Toyota Jidosha Kabushiki Kaisha

Hitachi Maxwell, Ltd.

Hitachi Maxell Energy, Ltd.

Yuko Sawaki

Mikio Kishimoto

Makoto Morishima

Kazutaka Matsuo

Takayuki Hirashige

Shinichi Matsumoto

Haruyuki Nakanishi

Masahiro Imanishi

Shigeaki Murata

Noriaki Otani

Nobuko Kasajima

A composite electrolyte membrane uses a metal-oxide hydrate which has a number of hydration water molecules of 2.7 or more and 10 or less and/or which is in the form of particles having a particle diameter of 1 nm or more and 10 nm or less. The composite electrolyte membrane exhibits its expected original performance, has both a high proton conductivity and a low methanol permeability, and provides a high-output membrane electrolyte assembly for a fuel cell.

Composite electrolyte membrane, production method thereof, membrane-electrode assembly, and fuel cell

A catalyst for electrodes in solid-polymer fuel cells which comprises metal oxide particles themselves. The catalyst contains fine transition-metal oxide particles having, in the main phase, a perovskite structure represented by the general formula ABO(wherein A represents one or more elements selected among lanthanum, strontium, cerium, calcium, yttrium, erbium, praseodymium, neodymium, samarium, europium, silicon, magnesium, barium, niobium, lead, bismuth, and antimony; and B represents one or more elements selected among iron, cobalt, manganese, copper, titanium, chromium, nickel, and molybdenum), the fine oxide particles having lattice constants satisfying the following relationship (1):1.402&#x3c;2/()&#x3c;1.422&#x2003;&#x2003;(1)wherein a and c represent the minor-axis lengths of the perovskite type crystal lattice and b represents the major-axis length thereof.

Fine particle of perovskite oxide, particle having deposited perovskite oxide, catalyst material, catalyst material for oxygen reduction, catalyst material for fuel cell, and electrode for fuel cell

The zirconium oxide hydrate particles of the present invention are represented by the formula ZrO.nHO and have a mean primary particle size of 0.5 nm or more and 5 nm or less, and 'n' in the formula represents a number greater than 2.5. Moreover, the method for producing of zirconium oxide hydrate particles of the present invention includes the step of preparing zirconium oxide hydrate particles by adding an aqueous zirconium salt solution to an aqueous alkaline solution while controlling the pH to 7.0 or more and 13.0 or less, and the step of subjecting the zirconium oxide hydrate particles to a hydrothermal treatment in the presence of water at a temperature of 50&#xb0; C. or more and less than 110&#xb0; C. for 3 hours or more.

Zirconium oxide hydrate particles and method for producing the same

An aqueous alkaline solution containing a tin salt dissolved therein is mixed with a zinc compound, and an aqueous solution of an indium salt is added to the mixture. The resultant hydroxide or hydrate containing tin, indium and zinc is treated by heating at a temperature of 110 to 300&#xb0; C. in the present of water. Then, the resultant product is filtered, dried and treated by heating at a temperature of 300 to 1,000&#xb0; C. in an air and further reduced at a temperature of 150 to 400&#xb0; C. under a reducing atmosphere to obtain composite indium oxide particles of zinc oxide and tin-containing indium oxide, which have an average particle size of 5 to 100 nm. The resultant composite particles of zinc oxide and tin-containing indium oxide are suitably used to form a transparent conductive coating film having a UV-shielding effect.

Composite indium oxide particle which contains tin (Sn) and zinc (Zn), method for producing same, conductive coating material, conductive coating film, and conductive sheet

An aqueous solution of a tin salt and an indium salt is added to an aqueous alkaline solution to form a hydroxide or a hydrate comprising tin and indium, the hydroxide or hydrate is heated at a temperature of 110 to 300&#xb0; C. in the presence of water, filtered and dried, and then the hydroxide or hydrate is heated at a temperature of 200 to 1000&#xb0; C. to form the tin-containing indium oxide particles. Thereby, tin-containing indium oxide particles which have a plate-form shape and an average particle size in the plane direction of 10 to 200 nm are obtained. The tin-containing indium oxide particles are suitable for forming an electrically conductive transparent coating film.

Indium particle containing tin, method for producing the same and electroconductive sheet comprising the same

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Kyoto, Japan

Yuko Sawaki