Showa Denko K.k.

Chunfu Yu

Takashi Sato

Ryuji Monden

Yasuaki Wakizaka

Kunchan Lee

Masaki Horikita

Takuya Imai

Kazunori Ichioka

Yoshinori Abe

Akihiko Shirakawa

Kenichiro Ota

Koji Tokita

Ryoko Konta

Hirofumi Fukunaga

A process for producing an oxygen reducing catalyst including a step of heat-treating, in a non-oxidizing atmosphere, a catalyst precursor including a compound (i) supplying a carbon element and a nitrogen element by heating in a non-oxidizing atmosphere, and a compound (ii) containing at least one element of iron and cobalt. Also disclosed is an oxygen reducing catalyst, a fuel cell catalyst layer including the oxygen reducing catalyst, an electrode including the fuel cell catalyst layer, a membrane-electrode assembly including the electrode and a fuel cell including the membrane-electrode assembly.

Process for producing oxygen reducing catalyst and uses thereof

A catalyst carrier production process includes a step (a) of mixing a transition metal compound (1), a nitrogen-containing organic compound (2), and a solvent to provide a catalyst carrier precursor solution; a step (b) of removing the solvent from the catalyst carrier precursor solution; and a step (c) of thermally treating a solid residue obtained in the step (b) at a temperature of 500 to 1100&#xb0; C. to provide a catalyst carrier; wherein the transition metal compound (1) is partly or wholly a compound including a transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element; and at least one of the transition metal compound (1) and the nitrogen-containing organic compound (2) includes an oxygen atom.

Process for producing catalyst carrier, process for producing composite catalyst, composite catalyst, and fuel cell using same

A production process for an electrode catalyst for a fuel cell, which includes a step (I) of mixing a nitrogen-containing organic substance, a transition metal compound and conductive particles with a solvent and a step (II) of calcining a mixture obtained in the step (I).

Production process for electrode catalyst for fuel cell and uses thereof

In a direct-liquid fuel cell supplied directly with a liquid fuel, a process for producing an electrode catalyst for a direct-liquid fuel cell is provided which is capable of suppressing decrease in cathode potential caused by liquid fuel crossover and providing an inexpensive and high-performance electrode catalyst for a direct-liquid fuel cell. The process for producing an electrode catalyst for a direct-liquid fuel cell includes Step A of mixing at least a transition metal-containing compound with a nitrogen-containing organic compound to obtain a catalyst precursor composition, and Step C of heat-treating the catalyst precursor composition at a temperature of from 500 to 1100&#xb0; C. to obtain an electrode catalyst, wherein part or entirety of the transition metal-containing compound includes, as a transition metal element, at least one transition metal element M1 selected from Group IV and Group V elements of the periodic table.

Process for producing catalyst for direct-liquid fuel cell, catalyst produced by the process and uses thereof

A catalyst carrier production process includes a step (a) of mixing a transition metal compound (), a nitrogen-containing organic compound (), and a solvent to provide a catalyst carrier precursor solution; a step (b) of removing the solvent from the catalyst carrier precursor solution; and a step (c) of the thermally treating a solid residue obtained in the step (b) at a temperature of 500 to 1100&#xb0; C. to provide a catalyst carrier; wherein the transition metal compound () is partly or wholly a compound including a transition metal element (M) selected from the group 4 and 5 elements of the periodic table as a transition metal element; and at least one of the transition metal compound () and the nitrogen-containing organic compound () includes an oxygen atom.

Provided is a process for producing a fuel cell electrode catalyst having high catalytic activity which uses a transition metal, e.g., titanium, which process comprises thermal treatment at relatively low temperature, i.e., not including thermal treatment at high temperature (calcining) step. The process for producing a fuel cell electrode catalyst comprises a step (1) of mixing at least a transition metal-containing compound, a nitrogen-containing organic compound and a solvent to provide a catalyst precursor solution; a step (2) of removing the solvent from the catalyst precursor solution; and a step (3) of thermally treating a solid residue obtained in the step (2) at a temperature of 500 to 1100&#xb0; C. to provide an electrode catalyst; wherein the transition metal-containing compound is partly or wholly a compound comprising at least one transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element.

Process for producing fuel cell electrode catalyst, process for producing transition metal oxycarbonitride, fuel cell electrode catalyst and uses thereof

The invention relates to a method for a complex oxide film having a high relative dielectric constant formed on a substrate surface by wet-treatment method and a production process of the complex oxide film comprising a step of washing the complex oxide film with an acid solution of pH 5 or less to thereby reduce salts in the film. Further, the invention relates to a dielectric material and a piezoelectric material containing the complex oxide film, a capacitor and a piezoelectric element including the material, and a electronic device comprising the element.

Complex oxide film and method for producing same, dielectric material including complex oxide film, piezoelectric material, capacitor, piezoelectric element, and electronic device

There is provided a method for producing a capacitor which is capable of producing a capacitor having a high withstand voltage and low leakage current,

Growing community of inventors

Tokyo, Japan

Chunfu Yu