US 2014/0193739 A1 · OXYGEN REDUCTION CATALYST, METHOD FOR PRODUCING THE SAME, AND POLYMER ELECTROLYTE FUEL CELL

Abstract

It is an object of the present invention to provide an oxygen reducing catalyst having high catalytic activity and high durability using a transition metal (such as titanium); and a method for producing a fuel cell electrode catalyst using the oxygen reducing catalyst. The present invention provides the oxygen reduction catalyst including titanium, carbon, nitrogen, and oxygen as constituent elements at a specific ratio, wherein in XRD measurement using a Cu—Kα ray, peaks are each present in at least regions A and B among regions A to D which occupy 2θ ranges of 42° to 43°, B: 36.5° to 37°, 25° to 26°, and 27° to 28°, respectively; and each of maximum peak intensities IA, IB, IC, and ID in the regions A to D satisfies both relationships of IA>IB and 0.3≦(IA/(IA+IC+ID))≦1.

Claims20

Dependent claims

An oxygen reduction catalyst comprising titanium, carbon, nitrogen, and oxygen as constituent elements, wherein

0.1<x≦7, 0.01<y≦2, and 0.05<z≦3 are met when a ratio of the number of atoms of each of the constituent elements (titanium:carbon:nitrogen:oxygen) is represented by 1:x:y:z;
in XRD measurement using a Cu—Kα ray, peaks are each present in at least regions A and B among regions A to D which occupy 28 ranges described below:
A:
42° to 43°,
B:
36.5° to 37°,
C:
25° to 26°, and
D:
27° to 28°;
and
each of maximum peak intensities IA, IB, IC, and ID in the regions A to D satisfies both relationships described in expressions (1) and (2) described below:
IA>IB (1), and
0.3≦(IA/(IA+IC+ID))≦1 (2).

11 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/232,409Filed 13 Apr 2012

Priority

JP 2011-15585314 Jul 2011

Published

10 Jul 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01M 4/8652
Consisting of more than one material, e.g. consisting of composites: as mixture
H01M 4/9016
Selection of catalytic material: oxides, hydroxides or oxygenated metallic salts
H01M 4/9091
Selection of catalytic material: unsupported catalytic particles; loose particulate catalytic materials, e.g. in fluidised state
H01M 2004/8689
Characterised by the polarity: positive electrodes

Oxygen reduction catalyst, method for producing the same, and polymer electrolyte fuel cell

Life of this patent

Oxygen reduction catalyst, method for producing the same, and polymer electrolyte fuel cell

Life of this patent

Abstract

Claims20