Polybenzimidazole pastes and gels for fuel cells

Patent

number:

WO

99104444

Publication

date: 28 January

Inventors:

F.J.

Sansone,

Patent 1999

Onorato,

D.W.

Kim,

Publication

M.J.

S.M.

number:

99104446

date: 28 January

Inventors:

French,

WO

R.H.

J.A. Ronne,

Barton,

H.H.

1999

Applicant:

Applicant:

The patent

Hoechst

patent

AG,

describes

producing

a method

for (PBI)

polymer

to

dissolve

with

a gel-

consistency

at room

number:

Publication

WO

and

Inventors: Sansone,

a

paste-like

be

carbon,

metal

or ceramic,

50 urn long,

99104445

with one or including PTFE.

1999

network

Systems

patent

exchange

comprises

membrane with

resilient

impermeable

integral

comprises

a

impregnated

seal. This

sealant into

the

regions. surround

The the

seal

material

layers in the MEA’s

area of the MEA.

should

also extend

laterally

the edge of the MEA,

be

provided

beyond

openings,

that

The

as

are formed

sealant

material

be a flow-processable applied to the MEA injection being

moulding

cross-ribs at spaced

parallel

fluid

raised

extending intervals.

1999

ribs,

improved

with

provide seals

protection

that against

leaks in a fuel cell assembly.

Research

J.I? Capp,

of

by contacting

with

a

Plug Power,

patent

system

and

fuel cell fluid

oxides mixed

copper

mixed

of silver,

inlets

mixtures

of these.

directly mix

part of a stream for a fuel cell. Each a portion

of

into its flow channel,

this

water

with

serves

may

and

gels;

and

scavenger

area between

0.5 and 200 m*/g, a CO

The

separator,

iror

of tin

about

and is housed

which

the

hydrogen

to hydrate

the

Patent number: WO 99105742 Publication akte: 4 February 1999 Inventors:

to the anode

in

provides

the

be augmented

system,

has a surface

oxides

the

corresponding parts of a given fuel cell membrane. The hydration metering

mixed

wit1

nickel,

of

portion

This

tin;

am

of manganese

in combination

oxides

SnO,-CuO

injects

in

then

of manganese

copper;

fluid

and

oxides

and

port

of

the CO

stream,

flow plates and injection ports. Each plate has flow channels with for receiving

capable

oxidising

of mixed

a hydration

includes

gas

regenerating the scavenger. The scavenger is selected from the grouI

USA

describes

that

a method monoxide

the gas stream

scavenger

gas

&

USA

comprises

stream

copper;

Industries

Patent number: Publication

for

fuel

cells

problems

is

R.J.

of a fuel cell

Bellows,

J.L.

Robbins

by a

including

flow

inherent is

in highly

USA

of

carbon

a moulded conductive and

a

the

cathode

the

electrically is between

4

99105737

date: 4 February

T. Okamoto,

1999 F.

K. Hamada

stream

stream.

It also

A

flexible

Carbon

Corporation,

USA

graphite

sheet

described which has ceramic fibres extending

is

for

from

the

to the cathode covers

retention the total

inlet

stream.

cooling

inlet

an anode system,

enthalpy

to of the

The system

water

also

management

with

segregated

deionised

water

and

cooling

water

loops

interconnected heat-exchanger.

embedded from its

system heat

anode stream exiting the fuel cell equal to the total enthalpy of the anode

Flexible graphite composite Technology

latent

exhaust

features

Ucar

Walsh

Corporation,

humidification

transferring

maintain

K. Saito, A. Hagiwara,

Applicant:

Emprise

humidity WO

1999

Jones, M.M.

A fuel cell gas management system is described which includes a

high

compound;

powder

number:

Inventors:

The

comprises powder

Publication Tanno,

produced.

electrically

molecular weight aspect ratio of

D.O.

Fuel cell gas management system Applicant:

item

99105740

to be free

It

can be easily

WO

date: 4 February

Inventors:

and

Patent

to

Mercuri,

1999

Applicant:

electrically conductive, acts as a barrier to gases, has high strength,

in the

prior

99105738

Fuel cell membrane hydration and fluid metering

stream.

for fuel cells

designs.

should

between them The raised ribs

cross-ribs

compartmentalised provide

process

R.A.

corresponding J.M.

that is claimed

conductive and 60.

elastomer using an

Company,

the

water

cured. The seal has a multiple

spaced

and

any

manifold

WO

date: 4 February

injection

free-

Denton,

Exxon

Engineering

a hydrogen-rich

to

separator

separator

the

around

such

A

of several

peripheral region including the MEA’s edge. An integral seal may openings,

flexible,

Nisshinbo

previous

to envelop

plate in

Applicant:

content

number:

Publication

of reactant

Inc, Japan

sealing

seal

as a flow-field

a

regulators.

porous

The

into

Patent

system

described

integral seal should electrochemically

active

MEA.

deformation

the carbon

A

R.J. Potter

Separator

sheet is grooved

for reducing

be

US 5865968 J.

Applicant:

fluid-

electrode

may

ion-

and electrode

a

0.3 g/cm3.

date: 2 February

Gascoyne,

The improved fuel cell membrane electrode assembly (MEA) described

more polymers The density of the layers

using a CO scavenger

The invention

The

0.2 and

layer.

Inventors:

Inc, Canada

this

a diameter

are precoated

the

number:

Publication Power

fibres

polymer,

with

or further

Patent Ballard

The

which

to

of the

CO removal regenerable

preferentially

layer

glass,

is less than

second standing

seal for fuel cell

Applicant:

also

permeability

J.J. Gough

continuous, of fibres and a

substance.

may

applied

layers

catalyst a network

polymeric

which

a flexible,

of up to 1 pm and between

F.J. Onorato, M.J. S.M. French, F. Marikar

Resilient MEA

a gas diffusion

comprising

temperature.

date: 28 January

Plc,

sheet,

fuel cells.

Inventors:

containing nonwoven

PBI

form

or

Matthey

describes

free-standing

powder with a suitable of acid, which permits the

matrix

Johnson

electrode

use in a [direct

fuel cell, by mixing

polymer amount

electrodes

UK

Germany

polybenzimidazole

or gel for

methanol]

in

the

shape useful

Polybenzimidazole pastes and gels for fuel cells

Patent

increase

the

by mechanical

Voss

Gas diffusion

paste

into

sheet to resin. The

P.R. Gibb,

E Marikar

The

surfaces

by a brazed-plate

Patent number: Publication Inventor:

WO

99105741

date: 4 February R.A.

1999

Dubose

Fuel Cells Bulletin No. 7