Catalyst

Patent metadata

Field	Value
Publication number	US-10615423-B2
Application number	US-201515509660-A
Country	US
Kind code	B2
Filing date	Sep 8, 2015
Priority date	Sep 8, 2014
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A catalyst comprising particles of iridium oxide and a metal oxide (M oxide), wherein the metal oxide is selected from the group consisting of a Group 4 metal oxide, a Group 5 metal oxide, a Group 7 metal oxide and antimony oxide, wherein the catalyst is prepared by subjecting a precursor mixture to flame spray pyrolysis, wherein the precursor mixture comprises a solvent, an iridium oxide precursor and a metal oxide precursor is disclosed. The catalyst has particular use in catalysing the oxygen evolution reaction.

First claim

The invention claimed is:

1. A catalyst layer comprising an electrocatalyst and a catalyst comprising particles of iridium oxide and a metal oxide (M oxide), wherein the metal oxide is selected from the group consisting of tantalum oxide, manganese oxide, niobium oxide and antimony oxide, wherein the catalyst is prepared by subjecting a precursor mixture to flame spray pyrolysis, wherein the precursor mixture comprises a solvent, an iridium oxide precursor and a metal oxide precursor;
wherein the surface area of the catalyst is ≥50 m 2 /g;
wherein the particles of iridium oxide and the metal oxide have a d90 of ≤15 nm wherein d90 means 90% of the particles have a size less than or equal to 15 nm; and
wherein the atomic ratio of iridium to metal in the metal oxide is from 80:20 to 40:60.

2. A catalyzed membrane comprising an ion-conducting membrane and a catalyst layer according to claim 1 .

3. A membrane electrode assembly comprising a catalyst layer according to claim 1 .

4. An electrochemical device comprising a catalyst membrane according to claim 1 .

Assignees

• Johnson Matthey Fuel Cells Ltd

Inventors

• O'Malley Rachel Louise
• Petrucco Enrico
• Johnson Simon

Classifications

• B01J23/6486

  Tantalum · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J23/468

  Iridium · CPC title

• H01M4/8647

  consisting of more than one material, e.g. consisting of composites · CPC title

• B01J23/6562

  Manganese · CPC title