Carbon powder for catalyst, catalyst, electrode catalyst layer, membrane electrode assembly, and fuel cell using the carbon powder

Patent metadata

Field	Value
Publication number	US-10135074-B2
Application number	US-201415025354-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Sep 30, 2013
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The present invention is to provide a carbon powder that can provide a catalyst having excellent durability and a catalyst. A carbon powder for catalyst of the present invention is a carbon powder containing as a main component carbon, which has a BET specific surface area per unit weight of 900 m 2 /g or greater, and a ratio R′ (D′/G intensity ratio) of peak intensity for a D′-band (D′ intensity) measured in the vicinity of 1620 cm −1 to peak intensity for a G-band (G intensity) measured in the vicinity of 1580 cm −1 by Raman spectroscopy of 0.6 or less.

First claim

The invention claimed is:

1. A catalyst having a catalyst metal supported on a carbon powder for catalyst, the carbon powder containing as a main component carbon and comprising:
a BET specific surface area per unit weight of 900 m 2 /g or greater;
a ratio R′ (D′/G intensity ratio) of peak intensity for a D′-band (D′ intensity) measured in the vicinity of 1620 cm −1 to peak intensity for a G-band (G intensity) measured in the vicinity of 1580 cm −1 by Raman spectroscopy of 0.6 or less; and
a ratio R (D/G intensity ratio) of peak intensity for a D-band (D intensity) measured in the vicinity of 1360 cm −1 to the peak intensity for the G-band (G intensity) measured in the vicinity of 1580 cm −1 by Raman spectroscopy is 1.7 or more,
wherein the carbon powder contains micropores having a radius of less than 1 nm and mesopores having a radius of 1 nm or more, and
wherein at least a portion of the catalyst metal is supported inside the mesopores.

2. The catalyst according to claim 1 , wherein the catalyst metal is platinum or comprises platinum and at least one of ruthenium, iridium, rhodium, palladium, osmium, tungsten, lead, iron, copper, silver, chromium, cobalt, nickel, manganese, vanadium, molybdenum, gallium, or aluminum.

3. An electrode catalyst layer for fuel cell comprising the catalyst according to claim 1 and an electrolyte.

4. A membrane electrode assembly for fuel cell comprising the electrode catalyst layer for fuel cell according to claim 3 .

5. A fuel cell comprising the membrane electrode assembly for fuel cell according to claim 4 .

6. An electrode catalyst layer for fuel cell comprising the catalyst according to claim 2 and an electrolyte.

7. The catalyst according to claim 1 , wherein a pore volume of the micropores is 0.3 cc/g-carbon powder or more.

8. The catalyst according to claim 1 , wherein a mode radius of pore distribution of micropores is 0.3 nm or more and less than 1 nm.

9. The catalyst according to claim 1 , wherein the ratio R (D/G intensity ratio) of peak intensity for a D-band (D intensity) measured in the vicinity of 1360 cm −1 to the peak intensity for the G-band (G intensity) measured in the vicinity of 1580 cm −1 by Raman spectroscopy is 1.7 or more and 2.5 or less.

Assignees

• Nissan Motor
• Nippon Steel & Sumikin Chem Co

Inventors

• Takahashi Shinichi
• Ohma Atsushi
• Mashio Tetsuya
• Akizuki Ken

Classifications

• H01M4/926 Primary

  on carbon or graphite · CPC title

• H01M8/1004

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

• H01M4/9083

  on carbon or graphite · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• B01J35/0033

  Operations & Transport · mapped topic