Patent · US Active

Core/shell-type catalyst particles and methods for their preparation

US8304362B2 · kind B2 · utility

5Cited by

15References

11Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Marco Lopez · Frankfurt, DE
Michael Lennartz · Frankfurt, DE
Dan V. Goia · Potsdam, US
Carsten Becker · Weingarten, DE
Stéphanie Chevalliot · Val-de-Reuil, FR

Key dates

Filing date	Aug 27, 2007
Grant date	Nov 6, 2012
Priority date	—
Expiry date	Aug 27, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2991
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention discloses core/shell type catalyst particles comprising a Mcore/Mshell structure with Mcore=inner particle core and Mshell=outer particle shell, wherein the medium diameter of the catalyst particle (dcore+shell) is in the range of 20 to 100 nm, preferably in the range of 20 to 50 nm. The thickness of the outer shell (tshell) is about 5 to 20% of the diameter of the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The core/shell type catalyst particles, particularly the particles comprising a Pt-based shell, reveal a high specific activity. The catalyst particles are preferably supported on suitable support materials such as carbon black and are used as electrocatalysts for fuel cells.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.