Catalyst for fuel cell, method of preparing same, and membrane-electrode assembly for fuel cell including same

Patent metadata

Field	Value
Publication number	US-2016226075-A1
Application number	US-201514876388-A
Country	US
Kind code	A1
Filing date	Oct 6, 2015
Priority date	Feb 2, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

A catalyst for a fuel cell includes an oxide represented by the following Chemical Formula 1 and a reaction-induced material including SiO 2 , a method of preparing the same, and a membrane-electrode assembly for a fuel cell including the same are disclosed.
Ir a Ru b O x   [Chemical Formula 1]

In Chemical Formula 1, a, b and x are the same as defined in the detailed description.

First claim

What is claimed is:

1 . A catalyst for a fuel cell, comprising
an oxide represented by the following Chemical Formula 1; a reaction-induced material including SiO 2 .
Ir a Ru b O x   [Chemical Formula 1]

wherein, a/b ratio ranges from about 0.3 to about 3.5, and x is an integer of about 0.5 to about 2.

2 . The catalyst for a fuel cell of claim 1 , wherein in the oxide represented by the Chemical Formula 1, the a/b ratio ranges from about 0.5 to about 2.

3 . The catalyst for a fuel cell of claim 1 , wherein the oxide represented by the Chemical Formula 1 has a shape of a nanoparticle, a nanorod, a core-shell or a combination thereof.

4 . The catalyst for a fuel cell of claim 1 , wherein the oxide has an average particle diameter (D50) of about 1 nm to about 6 nm.

5 . The catalyst for a fuel cell of claim 1 , further comprising a carrier supporting the oxide represented by the Chemical Formula 1.

6 . The catalyst for a fuel cell of claim 5 , wherein the carrier comprises graphite, denka black, ketjen black, acetylene black, carbon nanotube, carbon nano fibers, a carbon nano wires, a carbon nano balls, activated carbon, stabilized carbon, indium tin oxide (ITO), TiO 2 , WO, SiO 2 , or a combination thereof.

7 . The catalyst for a fuel cell of claim 5 , wherein the SiO 2 is included in an amount of about 0.5 wt % to about 5 wt % based on the total amount of the oxide represented by the Chemical Formula 1 and the carrier.

8 . The catalyst for a fuel cell of claim 5 , wherein the sum of the oxide represented by the Chemical Formula 1 and the SiO 2 is included in an amount of about 20 wt % to about 99 wt % based on the total amount of the oxide, the SiO 2 and the carrier.

9 . The catalyst for a fuel cell of claim 1 , which further comprises an active material comprising a metal.

10 . The catalyst for a fuel cell of claim 9 , wherein the active material further comprises a carrier supporting the metal.

11 . The catalyst for a fuel cell of claim 10 , wherein the metal is included in an amount of about 10 wt % to about 80 wt % based on the total amount of the metal and the carrier.

12 . The catalyst for a fuel cell of claim 9 , wherein the oxide represented by the Chemical Formula 1 is included in an amount of about 0.5 parts by weight to about 10 parts by weight based on 100 parts by weight of the active material.

13 . A method of preparing a catalyst for a fuel cell, comprising
mixing an iridium precursor and a ruthenium precursor so that an Ir/Ru atomic ratio is about 0.3 to about 3.5 and adding SiO 2 thereto to obtain a mixture; subjecting the mixture to a first heat treatment; subjecting the first heat-treated mixture to a second heat treatment; and removing at least one part of the SiO 2 from the second heat treated mixture to prepare an oxide represented by the following Chemical Formula 1, and a reaction-induced material comprising SiO 2 .
Ir a Ru b O x   [Chemical Formula 1]

wherein, a/b ratio ranges from about 0.3 to about 3.5, and x is an integer of about 0.5 to about 2.

14 . The method of claim 13 , wherein a carrier is further added to the mixture.

15 . The method of claim 14 , wherein the carrier comprises graphite, denka black, ketjen black, acetylene black, carbon nanotube, carbon nano fibers, carbon nano wires, carbon nano balls, activated carbon, stabilized carbon, indium tin oxide (ITO), TiO 2 , WO, SiO 2 , or a combination thereof.

16 . The method of claim 13 , wherein the first heat treatment is performed under a hydrogen atmosphere at a temperature of about 150° C. to about 500° C.

17 . The method of claim 13 , wherein the second heat treatment is performed under an air atmosphere at a temperature of about 200° C. to about 500° C.

18 . A membrane-electrode assembly for a fuel cell, comprising
a cathode and an anode facing each other; and a polymer electrolyte membrane between the cathode and anode, wherein the cathode and the anode respectively includes an electrode substrate and a catalyst layer disposed on the electrode substrate and comprising the catalyst of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Min Myoung-Ki
• You Eun-Young
• KONG Nak-Won

Classifications

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/9083

  on carbon or graphite · CPC title

• H01M4/9016 Primary

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title