Patents by Inventor Holger Dziallas

Holger Dziallas has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240039014
    Abstract: The invention relates to a method of attaching a gasket (4) to a bipolar plate (12). The method comprises the steps of applying and aligning a first gasket foil (4a) to a second gasket foil (4b) having connection recesses (8), connecting the first gasket foil (4a) to the second gasket foil (4b), so that the gasket (4) is formed, placing the gasket (4) on the bipolar plate (12) so that the second gasket film (4b) with the bonding recesses (8) abuts the bipolar plate (12) and performing an embossing step in which an embossing force is applied with an embossing tool (20) in the region of the connecting recesses (8) so that an embossed adhesive point (24) is formed and the first gasket foil (4a) is bonded to the bipolar plate (12) via an adhesive means (16) arranged in the connecting recess (8) on the first gasket foil (4a).
    Type: Application
    Filed: December 17, 2021
    Publication date: February 1, 2024
    Inventors: CHRISTOPH HALUSCHKA, EBERHARD MAIER, ALI RIZA YILDIRIM, MARTIN GERLACH, ANTON RINGEL, ANDREAS RINGK, FLORIAN ALEXANDER KNORR, AUDE MULLER, JENNY ANDERSSON, MATTIAS HOLMBERG, STEFAN MUNTHE, STEFAN ANDERSCH, HOLGER DZIALLAS, JENS-PETER SUCHSLAND
  • Publication number: 20150236354
    Abstract: The invention relates to colloidal dispersions comprising nano-sized precious metal particles (e.g. platinum or platinum alloy particles) and at least one ionomer component having acidic groups. The method for its manufacturing is based on a neutralization and dissolving process of a suitable precious metal precursor compound with a liquid acidic ionomer component, followed by a reduction step. Suitable precious metal precursors consist of precious metal atoms, hydrogen atoms, oxygen atoms and optionally carbon atoms. Examples for precursors are H2Pt(OH)6, Pd(OH)2 or Ir(OH)4, preferred reducing agents are aliphatic alcohols or hydrogen. The invention further relates to pre-products for the manufacture of such colloidal dispersions, namely to compositions which contain precious metal precursors and at least one acidic ionomer compound.
    Type: Application
    Filed: August 29, 2013
    Publication date: August 20, 2015
    Inventors: Matthias Binder, Gerhard Heinz, Alessandro Ghielmi, Holger Dziallas, Volker Baenisch
  • Publication number: 20150014167
    Abstract: The present invention is directed to electrochemical gas sensors for the detection of combustible, flammable or toxic gases and to catalyst-coated membranes (CCMs) used therein. The gas sensor comprises at least one solid anion exchange membrane (AEM), a sensing electrode and a counter electrode. The sensing electrode comprises catalytically active material and anionic ionomer material, the weight ratio between the catalyst material and the anionic ionomer material in the sensing electrode is in the range of 3/1 to 99/1, preferably in the range of 4/1 to 30/1. Due to the use of anion exchange ionomer materials, the sensor can be made less expensive and suitable for high volume production. When applied for the detection of CO, the sensor shows good CO selectivity S(CO/H2) in the presence of hydrogen.
    Type: Application
    Filed: March 14, 2013
    Publication date: January 15, 2015
    Applicant: SOLVICORE GMBH & CO. KG
    Inventors: Holger Dziallas, Jan Byrknes, Christian Eickes, Alessandro Ghielmi
  • Patent number: 8512912
    Abstract: The invention relates to a membrane electrode unit (MEU) for electrochemical apparatuses, in particular for direct methanol fuel cells (DMFC). The membrane electrode unit contains backings (i.e. gas diffusion layers) on the anode side and cathode side, which have a different water tightness (WT). The anode backing must have a lower water tightness (i.e. a higher water permeability) than the cathode backing, where WTAnode<WTCathode. The anode backing preferably has no compensating layer (microlayer), has a lower content of water repellent (from 2 to 10 wt.-%, based on the total weight) and has a higher total pore volume (VTot) than the cathode backing. The membrane electrode units produced have a substantially improved performance in DMFC fuel cells which are operated with aqueous methanol solution.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: August 20, 2013
    Assignee: Umicore AG & Co. KG
    Inventors: Joachim Koehler, Sandra Wittpahl, Holger Dziallas, Christian Eickes
  • Patent number: 8394551
    Abstract: The invention relates to a membrane-electrode assembly (MEA) for electrochemical devices, in particular for membrane fuel cells. The membrane-electrode assembly has a semi-coextensive design and comprises an ion-conducting membrane, two catalyst layers and gas diffusion layers of differing sizes on the front side and rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, while the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane. As a result, the ion-conducting membrane has a surface which is not supported by a gas diffusion layer on the front side. The membrane-electrode assembly has, owing to the particular construction, a stable structure which can be handled readily and displays advantages in the sealing of the reactive gases from one another and also in terms of the electrical properties. In particular, the hydrogen penetration current is significantly reduced.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: March 12, 2013
    Assignee: Umicore AG & Co. KG
    Inventors: Ralf Zuber, Sandra Wittpahl, Klaus Schaack, Holger Dziallas, Peter Seipel, Günther Vulpius, Bernd Dillmann
  • Patent number: 8343321
    Abstract: The invention relates to membrane-electrode assemblies for the electrolysis of water (electrolysis MEAs), which contain an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas diffusion layer on the front side; a second catalyst layer on the rear side, and a second gas diffusion layer on the rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, whereas the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane (“semi-coextensive design”). The MEAs also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEA products. Pressure-resistant, gastight and cost-effective membrane-electrode assemblies are obtained, that are used in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: January 1, 2013
    Assignee: Umicore AG & Co. KG
    Inventors: Ralf Zuber, Klaus Schaack, Sandra Wittpahl, Holger Dziallas, Peter Seipel, Pia Braun, Lutz Rohland
  • Publication number: 20120012457
    Abstract: The invention relates to membrane-electrode assemblies for the electrolysis of water (electrolysis MEAs), which contain an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas diffusion layer on the front side; a second catalyst layer on the rear side, and a second gas diffusion layer on the rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, whereas the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane (“semi-coextensive design”). The MEAs also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEA products. Pressure-resistant, gastight and cost-effective membrane-electrode assemblies are obtained, that are used in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.
    Type: Application
    Filed: July 13, 2011
    Publication date: January 19, 2012
    Applicant: UMICORE AG & CO. KG
    Inventors: Ralf ZUBER, Sandra WITTPAHL, Klaus SCHAACK, Holger DZIALLAS, Peter SEIPEL, Pia BRAUN, Lutz ROHLAND
  • Patent number: 7993499
    Abstract: The invention relates to membrane-electrode assemblies for the electrolysis of water (electrolysis MEAs), which contain an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas diffusion layer on the front side; a second catalyst layer on the rear side, and a second gas diffusion layer on the rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, whereas the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane (“semi-coextensive design”). The MEAs also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEA products. Pressure-resistant, gastight and cost-effective membrane-electrode assemblies are obtained, that are used in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: August 9, 2011
    Assignee: Umicore AG & Co. KG
    Inventors: Ralf Zuber, Klaus Schaack, Sandra Wittpahl, Holger Dziallas, Peter Seipel, Pia Braun, Lutz Rohland
  • Publication number: 20080067061
    Abstract: The invention relates to membrane-electrode assemblies for the electrolysis of water (electrolysis MEAs), which contain an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas diffusion layer on the front side; a second catalyst layer on the rear side, and a second gas diffusion layer on the rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, whereas the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane (“semi-coextensive design”). The MEAs also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEA products. Pressure-resistant, gastight and cost-effective membrane-electrode assemblies are obtained, that are used in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.
    Type: Application
    Filed: July 14, 2004
    Publication date: March 20, 2008
    Applicant: UMICORE AG & CO. KG
    Inventors: Ralf Zuber, Sandra Wittpahl, Klaus Schaack, Holger Dziallas, Peter Seipel, Pia Braun, Lutz Rohland
  • Publication number: 20070298312
    Abstract: The invention relates to a membrane electrode unit (MEU) for electrochemical apparatuses, in particular for direct methanol fuel cells (DMFC). The membrane electrode unit contains backings (i.e. gas diffusion layers) on the anode side and cathode side, which have a different water tightness (WT). The anode backing must have a lower water tightness (i.e. a higher water permeability) than the cathode backing, where WTAnode<WTCathode. The anode backing preferably has no compensating layer (microlayer), has a lower content of water repellent (from 2 to 10 wt.-%, based on the total weight) and has a higher total pore volume (VTot) than the cathode backing. The membrane electrode units produced have a substantially improved performance in DMFC fuel cells which are operated with aqueous methanol solution.
    Type: Application
    Filed: May 25, 2005
    Publication date: December 27, 2007
    Applicant: UMICORE AG & CO.KG
    Inventors: Joachim Koehler, Sandra Wittpahl, Holger Dziallas, Christian Eickes
  • Publication number: 20070215461
    Abstract: The invention relates to a membrane-electrode assembly (MEA) for electrochemical devices, in particular for membrane fuel cells. The membrane-electrode assembly has a semi-coextensive design and comprises an ion-conducting membrane, two catalyst layers and gas diffusion layers of differing sizes on the front side and rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, while the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane. As a result, the ion-conducting membrane has a surface which is not supported by a gas diffusion layer on the front side. The membrane-electrode assembly has, owing to the particular construction, a stable structure which can be handled readily and displays advantages in the sealing of the reactive gases from one another and also in terms of the electrical properties. In particular, the hydrogen penetration current is significantly reduced.
    Type: Application
    Filed: July 14, 2004
    Publication date: September 20, 2007
    Inventors: Ralf Zuber, Sandra Wittpahl, Klaus Schaack, Holger Dziallas, Peter Seipel, Gunther Vulpius, Bernd Dillmann
  • Publication number: 20060240311
    Abstract: The invention relates to a membrane electrode unit for electrochemical apparatuses, in particular for direct methanol fuel cells (DMFC) and a method for the production thereof. The multilayer MEUs for DMFC according to the invention comprise of an anode gas diffusion substrate, an anode catalyst layer, an ionomer membrane, a cathode catalyst layer and a cathode gas diffusion substrate, the anode catalyst layer being applied to the anode gas diffusion substrate, while the cathode catalyst layer is present directly on the membrane. Improved power values in combination with reduced precious metal consumption can be achieved thereby.
    Type: Application
    Filed: March 30, 2004
    Publication date: October 26, 2006
    Inventor: Holger Dziallas
  • Publication number: 20050014056
    Abstract: The invention concerns a membrane electrode unit (MEU) for electrochemical equipment, especially for membrane fuel cells. The membrane electrode unit has a “semi-coextensive” design and contains an ionically conductive membrane, two catalyst layers, and gas distributor substrates of different sizes on the front and back sides. The first gas distributor substrate has smaller surface dimensions than the ionically conductive membrane, while the second gas distributor substrate has the same area as the ionically conductive membrane. The membrane electrode unit has, because of its special design, a stable structure that can be handled well, and which exhibits advantages for sealing the reactive gases off from each other and in its electrical properties. In particular, the hydrogen penetration current is distinctly reduced. The membrane electrode unit is used in PEM fuel cells, direct methanol fuel cells, electrolyzers, and other electrochemical equipment.
    Type: Application
    Filed: October 30, 2003
    Publication date: January 20, 2005
    Inventors: Ralf Zuber, Klaus Schaack, Sandra Wittpahl, Holger Dziallas, Peter Seipel