Fuel cell catalyst with metal oxide/phosphate support structure and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-9252431-B2
Application number	US-200913147375-A
Country	US
Kind code	B2
Filing date	Feb 10, 2009
Priority date	Feb 10, 2009
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A fuel cell supported catalyst includes an underlying support structure having at least one of a metal oxide and a metal phosphate. Catalyst particles are arranged onto and in engagement with the support structure. An intermediate conductive, corrosion-resistant layer, such as boron-doped-diamond, is arranged onto and in engagement with the support structure to surround the catalyst particles. The supported catalyst is produced by depositing the intermediate layer onto the support structure after the catalyst particles have been deposited on the underlying support structure, in one example. In another example, voids are provided in the intermediate layer, which has been deposited onto the underlying support structure, to subsequently receive the catalyst particles.

First claim

The invention claimed is:

1. A fuel cell catalyst, comprising:
a support structure including at least one of a metal oxide and a metal phosphate;
catalyst particles, each of the catalyst particles directly on the support structure and physically supported by the support structure; and
a conductive, corrosion-resistant intermediate layer on the support structure and surrounding sides of the catalyst particles, a first portion of a surface of the catalyst particles remaining uncovered by the intermediate layer.

2. The fuel cell catalyst according to claim 1 , wherein the support structure includes oxides of at least one of titanium, zirconium, tungsten, tantalum, niobium, yttrium, molybdenum, indium and tin and their corresponding phosphates.

3. The fuel cell catalyst according to claim 1 , wherein the catalyst particles include at least one noble metal.

4. The fuel cell catalyst according to claim 3 , wherein the noble metal includes at least one of platinum, palladium, gold, ruthenium, rhodium, iridium, osmium, or alloys thereof.

5. The fuel cell catalyst according to claim 3 , wherein the catalyst particles include at least one transition metal.

6. The fuel cell catalyst according to claim 5 , wherein the transition metal includes at least one of cobalt, nickel, iron, copper, manganese, vanadium, titanium, zirconium and chromium.

7. The fuel cell catalyst according to claim 1 , wherein the conductive, corrosion-resistant intermediate layer includes at least one of boron-doped-diamond, graphitized carbon, diamond-like carbon, carbides, conductive polymers, and mixture of two or more thereof.

8. A method, comprising:
producing a fuel cell catalyst, the producing including:
providing a support structure including at least one of a metal oxide and a metal phosphate;
depositing dissolvable particles onto the support structure, the dissolvable particles being physically supported directly by the support structure;
after depositing the dissolvable particles, depositing a conductive, corrosion-resistant intermediate layer on the support structure and surrounding sides of the dissolvable particles, a first portion of the dissolvable particles remaining uncovered by the intermediate layer;
after depositing the intermediate layer, dissolving the dissolvable particles, leaving voids in the intermediate layer and exposing a surface of the support structure; and
after dissolving the dissolvable particles, depositing catalyst particles within the voids and directly onto the support structure.

9. The method according to claim 8 , wherein the conductive, corrosion-resistant intermediate layer includes at least one of boron-doped-diamond, graphitized carbon, diamond-like carbon, carbides and conductive polymers.

10. The method according to claim 8 , wherein the support structure includes oxides of at least one of titanium, zirconium, tungsten, tantalum, niobium, yttrium, molybdenum, indium, tin and their corresponding phosphates.

11. The method according to claim 8 , wherein the catalyst particles include at least one noble metal.

12. The method according to claim 11 , wherein the noble metal includes at least one of platinum, palladium, gold, ruthenium, rhodium, iridium, osmium, or alloys thereof.

13. The method according to claim 11 , wherein the catalyst particles include at least one transition metal.

14. The method according to claim 13 , wherein the transition metal includes at least one of cobalt, nickel, iron, copper, manganese, vanadium, titanium, zirconium and chromium.

Assignees

• Merzougui Belabbes
• Kawamura Tetsuo
• Audi Ag
• Toyota Motor Co Ltd

Inventors

• Merzougui Belabbes
• Kawamura Tetsuo

Classifications

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• B01J21/18

  Carbon · CPC title

• Y02E60/50

  Fuel cells · CPC title

• B01J23/89

  combined with noble metals · CPC title

• B01J37/024

  Multiple impregnation or coating · CPC title