# US 8,785,078 B2 · Fuel cell

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- Number: US 8,785,078 B2
- Document ID: US8785078B2
- Status: Granted
- Kind: B2
- Application number: 13/060,592
- Filed: 2008-10-10
- Published: 2011-07-28
- Granted: 2014-07-22
- Earliest claimed: 2008-10-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Hiroko Kimura; Naoki Takehiro
- Inventors: Hiroko Kimura; Naoki Takehiro
- Web page: https://patentgrep.com/patent/US8785078B2

## CPC

- H01M 8/0202: Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M 8/0204: Non-porous and characterised by the material
- H01M 8/023: Porous and characterised by the material
- H01M 8/0241: Composites
- H01M 8/0243: in the form of mixtures
- H01M 8/0247: characterised by the form (characterised by a channel configuration H01M8/0258)
- H01M 8/0258: characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M 8/04119: with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M 8/04171: {using adsorbents, wicks or hydrophilic material}
- H01M 8/04283: {Supply means of electrolyte to or in matrix-fuel cells}
- H01M 8/04291: Arrangements for managing water in solid electrolyte fuel cell systems (H01M8/04119 takes precedence)
- H01M 8/04835: {of fuel cell reactants}
- H01M 8/08: Fuel cells with aqueous electrolytes
- H01M 8/1018: Polymeric electrolyte materials
- H01M 8/04365: {of other components of a fuel cell or fuel cell stacks}
- H01M 8/04746: Pressure; Flow
- H01M 8/04768: {of the coolant}
- H01M 8/04791: Concentration; Density (H01M8/04828 takes precedence)
- H01M 8/04813: {of the coolant}
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention provides a fuel cell which is capable of improving electric power generation efficiency at a time of high-temperature operation. The fuel cell 10 comprising: a membrane electrode assembly 4; and a pair of gas separators 7, 8 sandwiching the membrane electrode assembly 4 therebetween, wherein at least one of the gas separator(s) 7 and/or 8 comprises a compact layer(s) 7c and/or 8c which is capable of preventing permeation of fluid and a porous layer (s) 7d and/or 8d which allows permeation of fluid, and the porous layer(s) 7d and/or 8d is impregnated with a water-soluble liquid having higher boiling point than that of water.

## Claims

### Claim 1

A solid polymer electrolyte fuel cell comprising:
a membrane electrode assembly; and a pair of gas separators sandwiching said membrane electrode assembly therebetween,
wherein each of said pair of gas separators comprises a compact layer which is capable of preventing permeation of fluid and a porous layer which allows permeation of fluid, and
said porous layer is impregnated with a water-soluble liquid having higher boiling point than that of water,
a liquid flow path for transporting said water-soluble liquid having higher boiling point than that of water is provided in an interface between said compact layer and said porous layer, and/or in said porous layer, and
said water-soluble liquid having higher boiling point than that of water is a dilute sulfuric acid.