Fuel cell electrode catalyst layer and manufacturing method therefor, and membrane electrode assembly, fuel cell, and vehicle using catalyst layer

Patent metadata

Field	Value
Publication number	US-2018261866-A1
Application number	US-201515758619-A
Country	US
Kind code	A1
Filing date	Sep 9, 2015
Priority date	Sep 9, 2015
Publication date	Sep 13, 2018
Grant date	—

Abstract

Provided is a fuel cell electrode catalyst layer which includes a catalyst carrier having a large specific surface area and a polymer electrolyte having a form in which at least a portion thereof is agglomerated, the fuel cell electrode catalyst layer exhibiting excellent power generation performance in a high-humidity environment (for example, 100% RH).

First claim

1 .- 10 . (canceled)

11 . A fuel cell electrode catalyst layer comprising:
a catalyst which includes a catalyst carrier and a catalyst metal carried on the catalyst carrier; and a polymer electrolyte, wherein a BET specific surface area of the catalyst carrier is more than 850 (m 2 /g carrier), the polymer electrolyte contains a sulfonic acid group as a cation-exchange group and the sulfonic acid group is contained in an amount of 1.2 (mmol/g carrier) or more, and a maximum value (I max ) and a minimum value (I min ) of a local I/C ratio satisfy the following Mathematical Formula 1.
[Mathematical Formula 1]
I max /I min ≥2.5  (Mathematical Formula 1)

12 . The fuel cell electrode catalyst layer according to claim 11 , wherein the polymer electrolyte is a crystalline polymer electrolyte.

13 . The fuel cell electrode catalyst layer according to claim 11 , wherein the polymer electrolyte has a polyfluorocarbon skeleton.

14 . A fuel cell membrane electrode assembly comprising the fuel cell electrode catalyst layer set forth in claim 11 .

15 . A fuel cell comprising the fuel cell membrane electrode assembly set forth in claim 14 .

16 . A vehicle comprising the fuel cell set forth in claim 15 .

17 . A method for manufacturing a fuel cell electrode catalyst layer including a catalyst which includes a catalyst carrier and a catalyst metal carried on the catalyst carrier, and a polymer electrolyte, comprising:
forming a coating film of a catalyst ink containing the catalyst and the polymer electrolyte; and heat-treating the coating film at a temperature equal to or higher than a glass transition temperature of the polymer electrolyte, wherein a BET specific surface area of the catalyst carrier is more than 850 (m 2 /g carrier), and the polymer electrolyte contains a sulfonic acid group as a cation-exchange group and the sulfonic acid group is contained in an amount of 1.2 (mmol/g carrier) or more.

18 . The method according to claim 17 , wherein the catalyst ink contains the polymer electrolyte at a weight ratio of 0.9 or more with respect to the catalyst carrier, and
an equivalent weight (EW) of the polymer electrolyte is 1000 g/mol or less.

19 . The method according to claim 17 , wherein the polymer electrolyte has a polyfluorocarbon skeleton.

Assignees

• Nissan Motor

Inventors

• Takahashi Shinichi
• Mashio Tetsuya
• Horai Atsushi
• Ohma Atsushi

Classifications

• H01M8/1039

  halogenated, e.g. sulfonated polyvinylidene fluorides · CPC title

• H01M8/1018

  Polymeric electrolyte materials · CPC title

• H01M2250/20

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

• H01M4/925 Primary

  supported on carriers, e.g. powder carriers · CPC title

• H01M8/1027

  having carbon, oxygen and other atoms, e.g. sulfonated polyethersulfones [S-PES] · CPC title