Showa Denko K.k.

Yokohama National University

Japan Science and Technology Agency

Panasonic Corporation

Akimitsu Ishihara

Kenichiro Ota

Shigenori Mitsushima

Akinori Sudoh

Satoshi Iinou

Nobuyuki Kamiya

Ken-ichiro Ota

Takaiki Nomura

Michikazu Hara

Kazuhito Hato

Kunchan Lee

Takahiro Suzuki

Kenichi Tokuhiro

Yoshinori Yamato

Makoto Hamazaki

Liu Yan

Kazunari Doumen

Takaaki Nagai

Shigenori Mittsushima

Provided is a novel oxygen reduction catalyst having good stability and higher oxygen reduction performance. The oxygen reduction catalyst includes a composite oxide comprising a conductive tin oxide containing Zr.

Oxygen reduction catalyst, fuel cell, air cell, and method for producing oxygen reduction catalyst

An object of the invention is to provide an oxygen reduction catalyst composed of a titanium oxynitride having high oxygen reduction capacity. The oxygen reduction catalyst of the invention is a titanium oxynitride that has a nitrogen element content of 8.0 to 15 mass %, has a crystal structure of anatase titanium dioxide in a powder X-ray diffraction measurement, and has a signal intensity ratio N&#x2014;Ti&#x2014;N/O&#x2014;Ti&#x2014;N in an X-ray photoelectron spectroscopic analysis of in the range of 0.35 to 0.70.

Oxygen reduction catalyst

The present invention provides a novel oxygen reduction catalyst having a good stability and a high oxygen reduction performance. The oxygen reduction catalyst includes: a conductive oxide; and an oxide(s), having oxygen holes and provided at least on the surface of the conductive oxide, of at least one or more transition metals selected from the group consisting of Ti, Zr, Nb and Ta.

Oxygen reduction catalyst and production method therefor

A semiconductor material of the present invention is a semiconductor material including an oxynitride containing at least one element selected from the Group 4 elements and Group 5 elements. In the oxynitride, part of at least one selected from oxygen and nitrogen is substituted with carbon. Nb is preferable as the Group 5 element.

Semiconductor material, optical hydrogen generating device using same, and method of producing hydrogen

A catalyst carrier, being characterized in that a catalyst metal for promoting an oxidation-reduction reaction is carried on a vapor-grown carbon fiber having an average outer diameter of from 2 nm to 500 nm, which has been subjected to a crushing treatment so as to have a BET specific surface area of from 4 m/g to 100 m/g and an aspect ratio of from 1 to 200, and exhibiting high activity per unit amount of a catalyst metal, a low reaction resistance and an improved output density, and is useful for a fuel cell; a production method thereof and a fuel cell using the catalyst carrier.

Catalyst carrier and fuel cell using the same

A corrosion-resistant electrode catalyst for oxygen reduction includes a main catalyst composed of at least one transition metal oxide selected from oxygen-deficient ZrO, TaO, NbO, TiO, VO, MoO, and WOand a co-catalyst composed of gold. The electrode catalyst is used in contact with an acidic electrolyte at a potential at least 0.4 V higher than the reversible hydrogen electrode potential. The catalyst may be used, for example, in such a form that the transition metal oxide in the form of fine particles and gold in the form of fine particles, or fine particles including fine gold particles coated with the transition metal oxide are dispersed on a catalyst carrier which is an electron conductive powder. This electrode catalyst is suitable as an electrode catalyst for an electrochemical system using an acidic electrolyte in the fields of water electrolysis, inorganic/organic electrolysis, fuel cells, etc.

Corrosion resistant metal oxide electrode catalyst for oxygen reduction

An electrode catalyst that maintains catalytic activity under conditions of an electrode potential as high as 0.4 V or above and exhibits improved stability. The metal oxynitride electrode catalyst is composed of an oxynitride containing at least one transition metal element selected from the group consisting of La, Ta, Nb, Ti, and Zr, the metal oxynitride electrode catalyst being used at a potential of 0.4 V or higher relative to the reversible hydrogen electrode potential in an acidic electrolyte. The metal oxynitride electrode catalyst is useful as an electrode catalyst for electrochemical systems used in acidic electrolytes in the fields of water electrolysis, organic electrolysis, fuel cells, etc.

Metal oxynitride electrode catalyst

Growing community of inventors

Kanagawa, Japan

Akimitsu Ishihara