Elcomax Membranes Gmbh

Volkswagen Ag

Lanxess Deutschland Gmbh

Sartorius Stedim Biotech Gmbh

Rhein Chemie Rheinau Gmbh

Carl Freudenberg Kg

Annette Reiche

Oliver Gronwald

Werner Obrecht

Stefan Weisshaar

Dieter Melzner

Suzana Kiel

Ulrich Maehr

Ulrich Mahr

Stefan Haufe

Thomas Früh

Hans-Heinrich Hörl

Torsten Ziser

Louis Villain

Domnik Bayer

Franziska Bäthe

Sandra Van Der Kruijs

Gabriel Nino-Amézquita

Manfred Gottlöber

Ulrich Mähr

Gabriel NIÑO-AMÉZQUITA

Thomas FRÜH

Carsten Pretorius

The present invention relates to a crosslinked unreinforced cellulose hydrate membrane crosslinked using at least two different crosslinking agents, to a method for the production thereof and to the use of the crosslinked unreinforced cellulose hydrate membrane according to the invention.

Crosslinked unreinforced cellulose hydrate membrane, method for the production thereof, and use thereof

The present invention relates to a polymer electrolyte membrane for fuel cells, comprising a polymer matrix of at least one basic polymer and one or more doping agents, wherein particles containing ionogenic groups and having a mean particle diameter in the nanometer range are embedded in the polymer matrix and the particles containing ionogenic groups are distributed homogeneously in the polymer matrix in a concentration of less than 50% relative to the weight of the polymer matrix, as well as to the production and use of same, especially in high-temperature fuel cells.

Polymer electrolyte membrane with functionalized nanoparticles

The invention relates to hybrid membranes that are composed of an organic polymer and an inorganic polymer, a method for producing hybrid membranes, and the use of said hybrid membranes in polymer electrolyte membrane fuel cells. The inventive hybrid membranes comprise at least one alkaline organic polymer and at least one inorganic polymer. Said polymers are blended together at a molecular level. The inorganic polymer is formed from at least one precursor monomer when the membrane is produced. The disclosed membranes are characterized in that the same are provided with high absorptivity for doping agents, have a high degree of mechanical and thermal stability in both an undoped and doped state, and feature permanently high proton conductivity.

Hybrid membranes, method for production of hybrid membranes and fuel cells using such hybrid membranes

A membrane-electrode assembly and polymer electrolyte fuel cells and methods of production thereof, in which a polymer membrane, containing at least one basic polymer membrane, is sandwiched between two flat gas diffusion electrodes each of which is loaded with a dopant, whereby after reaching a mass transport equilibrium for the exchange of the dopant between the gas diffusion electrodes and the polymer membrane, the polymer membrane has a conductivity of at least 0.1 S/m at a temperature of no less than 25&#xb0; C.

Membrane-electrode assembly, polymer membranes for a membrane-electrode assembly, polymer electrolyte fuel cells, and methods for the production thereof

A membrane for fuel cells, which is characterized by a homogeneous absorption and good retention of doping agents, and which guarantees a high mechanical stability at high temperatures when doped. Such membranes consist of at least one polymer, whose nitrogen atoms are chemically bonded to a central atom of a derivative of a polybasic inorganic oxo acid. The membranes are produced from polymer solutions that are devoid of water and oxo acid derivatives, by heating the solution that has been introduced into a membrane mold until a self-supporting membrane has been formed and then by thermally regulating the latter. Inventive fuel cells having a membrane electrode assembly (MEA) that comprises a membrane of the invention and phosphoric acid as the doping agent have, for example, an impedance of 0.5-1 &#x3a9;cmat a measuring frequency of 1000 Hz and at an operating temperature of 160&#xb0; C. and a gas flow for hydrogen of 170 mL/min and for air of 570 mL/min. They can be used as high-temperature polyelectrolyte membrane fuel cells for a working temperature of up to at least 250&#xb0; C.

Membranes for fuel cells, method for producing said membranes and production of fuel cells using membranes of this type

A proton-conducting electrolyte membrane is disclosed, comprising at least one base material and at least one dopant, which is the reaction product of an at least dibasic inorganic acid with an organic compound, comprising one acidic hydroxyl group, or the condensation product of said compound with a polybasic acid. The membrane may be produced by a single step method, which avoids the use of dangerous materials and environmental pollutants. Subsequent doping of the membrane, e.g., in conjunction with assembly of the membrane electrode assembly (MEA) is not excluded. The electrolyte membrane has a high and constant mechanical stability and flexibility, excellent chemical and thermal stability and a high and constant conductivity. The membrane may be used in a fuel cell in a wide temperature range from 50&#xb0; C. to more than 200&#xb0; C., for example, whereby the fuel cell has a high and constant power level over the entire temperature range.

Proton-conducting electrolyte membrane method for production and use thereof in a fuel cell

A membrane electrode assembly (MEA) for a fuel cell, which has a planar polymer membrane. This membrane, in a tangentially inner area, is coated on both sides with electrode structure, and, in a tangentially outer area projecting at least on one side beyond the electrode structure coating, is connected to a sealing member. A marginal zone of the polymer membrane is embedded in the elastomer sealing member. The sealing member extends tangentially inward to a transition area that lies tangentially between the outer area and the inner area, where it overlaps the electrode structures on outer faces of the electrode structures, on both of the sides of the polymer membrane.

Membrane electrode assembly for a fuel cell

Growing community of inventors

Göttingen, Germany

Annette Reiche