摘要:
Passive recovery of liquid water from the cathode side of a polymer electrolyte membrane through the design of layers on the cathode side of an MEA and through the design of the PEM, may be used to supply water to support chemical or electrochemical reactions, either internal or external to the fuel cell, to support the humidification or hydration of the anode reactants, or to support the hydration of the polymer electrolyte membrane over its major surface or some combination thereof. Such passive recovery of liquid water can simplify fuel cell power generators through the reduction or elimination of cathode liquid water recovery devices.
摘要:
A method and composition for making catalyst agglomerates is provided where the particles of the catalyst are dispersed in a non aqueous solvent and a ion conducting polymer under agitation to control agglomerate growth. The agglomerates can be incorporated into a membrane structure.
摘要:
The invention provides ion-conductive copolymers containing pendant ion conducting groups that can be used to fabricate proton exchange membranes (PEM's), catalyst coated proton exchange membranes (CCM's) and membrane electrode assemblies (MEA's) that are useful in fuel cells and their application in electronic devices, power sources and vehicles.
摘要:
The invention provides cross-linked ion-conductive copolymers. Such can take the form of proton exchange membranes (PEM's), catalyst coated proton exchange membranes (CCM's) and membrane electrode assemblies (MEA's) that are useful in fuel cells and their application in electronic devices, power sources and vehicles.
摘要:
This application relates to membrane electrode assemblies (MEA's) that contain an ion conducting adhesion promotion layer to promote structural stability at the interface of the PEM and catalyst layer within the MEA.
摘要:
An acid-base proton conducting polymer blend membrane is provided. The acid-base proton conducting polymer blend membrane comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, and a third polymer containing one or more functional units for improving membrane conductivity, flexibility, water remaining ability, dimension stability, and methanol crossover. In one embodiment, the acid-base polymer blend membrane of the present invention comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, wherein at least one of the first acidic and second basic polymer comprises one or more functional units to improve the properties of the membrane. The functional units include hydrophilic units, adhesion promoter units, methanol block units, dimensional stabilizer units, and flexible units.
摘要:
The invention includes compositions comprising at least first and second polymers and optionally a third polymer wherein acid subunits, basic subunits and elastomeric subunits are contained in the polymers. In one aspect, the composition comprises a ternary polymer blend comprising an acidic polymer comprising acidic subunits, a basic polymer comprising basic subunits and an elastomeric polymer comprising elastomeric subunits. In an alternate aspect, the composition comprises a binary polymer blend which comprises acidic or basic subunits in one polymer and a copolymer comprising the other of the acidic or basic subunit and an elastomeric subunit. Such polymer compositions may be formed into a membrane having electrochemical properties which permit the use of such a membrane in an electrochemical device.
摘要:
The invention provides a polymer blend containing a non-ionic polymer and an ion-conductive copolymer. The polymer blend can be used to fabricate proton exchange membranes (PEM's), catalyst coated proton exchange membranes (CCM's) and membrane electrode assemblies (MEA's) that are useful in fuel cells and their application in electronic devices, power sources and vehicles.
摘要:
The invention provides anisotropic polymer electrolyte membranes that can be used to fabricate catalyst coated membranes (CCM's) and membrane electrode assemblies (MEA's) that are useful in fuel cells.