Liquid composition, process for its production, and process for producing membrane-electrode assembly for polymer electrolyte fuel cells

Patent metadata

Field	Value
Publication number	US-2019067722-A1
Application number	US-201816173902-A
Country	US
Kind code	A1
Filing date	Oct 29, 2018
Priority date	Jun 22, 2004
Publication date	Feb 28, 2019
Grant date	—

Abstract

An electrolyte membrane is prepared from a liquid composition comprising at least one member selected from the group consisting of trivalent cerium, tetravalent cerium, bivalent manganese and trivalent manganese; and a polymer with a cation-exchange group. The liquid composition is preferably one containing water, a carbonate of cerium or manganese, and a polymer with a cation-exchange group, and a cast film thereof is used as an electrolyte membrane to prepare a membrane-electrode assembly. The present invention successfully provides a membrane-electrode assembly for polymer electrolyte fuel cells being capable of generating the electric power in high energy efficiency, having high power generation performance regardless of the dew point of the feed gas, and being capable of stably generating the electric power over a long period of time.

First claim

1 .- 8 . (canceled)

9 . A liquid composition comprising at least one member selected from the group consisting of trivalent cerium and tetravalent cerium; and a polymer having a cation-exchange functional group.

10 . The liquid composition according to claim 9 , wherein the cation-exchange functional group is a sulfonic acid group.

11 . The liquid composition according to claim 9 , which further comprises water.

12 . The liquid composition according to claim 11 , wherein at least one member selected from the group consisting of trivalent cerium, tetravalent cerium is present in an ionic state.

13 . The liquid composition according to claim 9 , wherein the polymer is dissolved or dispersed.

14 . The liquid composition according to claim 10 , wherein the polymer is a perfluorocarbon polymer having a sulfonic acid group (which may contain an etheric oxygen atom).

15 . The liquid composition according to claim 10 , wherein the trivalent or tetravalent cerium is contained in an amount of from 0.3 to 30 mol % relative to a molarity of —SO 3 − in the polymer.

16 . The liquid composition according to claim 10 , wherein an ion exchange capacity of the polymer is from 0.5 to 3.0 milliequivalent/g dry resin.

17 . The liquid composition according to claim 10 , wherein the polymer is a copolymer containing repeating units based on tetrafluoroethylene and repeating units based on a perfluorovinyl compound represented by CF 2 ═CF—(OCF 2 CFX) m —O p —(CF 2 ) n —SO 3 H where X represents a fluorine atom or a trifluoromethyl group, m represents an integer of from 0 to 3, n represents an integer of from 1 to 12 and p represents 0 or 1.

Assignees

• Agc Inc

Inventors

• Kawazoe Hisao
• Endoh Eiji
• Nakagawa Hideki
• Terazono Shinji

Classifications

• B01D69/141

  Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes · CPC title

• H01M8/1025

  having only carbon and oxygen, e.g. polyethers, sulfonated polyetheretherketones [S-PEEK], sulfonated polysaccharides, sulfonated celluloses or sulfonated polyesters · CPC title

• C08J5/2237

  containing fluorine · CPC title

• Y02P70/56

  Cross-Sectional Technologies · mapped topic

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title