Patents by Inventor Scott McDermid

Scott McDermid 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).

  • Patent number: 10886549
    Abstract: Simplified methods are disclosed for preparing a catalyst coated membrane that is reinforced with a porous polymer sheet (e.g. an expanded polymer sheet) for use in solid polymer electrolyte fuel cells. The methods involve forming a solid polymer electrolyte membrane by coating membrane ionomer solution onto a first catalyst layer and then applying the porous polymer sheet to the membrane ionomer solution coating, while it is still wet, such that the membrane ionomer solution only partially fills the pores of the porous polymer sheet. A second catalyst ink is then applied which fills the remaining pores of the porous polymer sheet. Not only are such methods simpler than many conventional methods, but surprisingly this can result in a marked improvement in fuel cell performance characteristics.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: January 5, 2021
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Yuquan Zou, Scott McDermid, Massimiliano Cimenti, Shun-wen Amy Yang, Liviu Catoiu
  • Patent number: 10593979
    Abstract: A membrane electrode assembly for a fuel cell, with a membrane, a catalyst layer (16) and a gas diffusion layer. The catalyst layer (16) has a first side facing the membrane and a second side facing the gas diffusion layer. In the catalyst layer (16) an ionomer content increases towards the membrane. The catalyst layer (16) has a first sublayer (22) in which catalyst particles (26) are coated with a first ionomer (28). The catalyst layer (16) further has a second sublayer (24) with a second ionomer (32) which is closer to the membrane than the first sublayer (22). Pores (30) are present at least between the coated catalyst particles (26). Further, a method for preparing such a membrane electrode assembly, a fuel cell system and a vehicle with a fuel cell system.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: March 17, 2020
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Carmen Chuy, Scott McDermid, Kyoung Bai, Tran Ngo
  • Patent number: 10403905
    Abstract: Simplified methods for preparing a catalyst coated membrane (CCM) for solid polymer electrolyte fuel cells. The CCM has two reinforcing, expanded polymer sheets and the methods involve forming the electrolyte membrane from ionomer solution during assembly of the CCM. Thus, the conventional requirement to obtain, handle, and decal transfer solid polymer sheets in CCM preparation can be omitted. Further, CCM structures with improved mechanical strength can be prepared by orienting the expanded polymer sheets such that the stronger tensile strength direction of one is orthogonal to the other. Such improved CCM structures can be fabricated using the simplified methods.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: September 3, 2019
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Yuquan Zou, Owen Thomas, Scott McDermid, Yunsong Yang, Jing Li, Carmen Chuy
  • Publication number: 20180323459
    Abstract: Simplified methods are disclosed for preparing a catalyst coated membrane that is reinforced with a porous polymer sheet (e.g. an expanded polymer sheet) for use in solid polymer electrolyte fuel cells. The methods involve forming a solid polymer electrolyte membrane by coating membrane ionomer solution onto a first catalyst layer and then applying the porous polymer sheet to the membrane ionomer solution coating, while it is still wet, such that the membrane ionomer solution only partially fills the pores of the porous polymer sheet. A second catalyst ink is then applied which fills the remaining pores of the porous polymer sheet. Not only are such methods simpler than many conventional methods, but surprisingly this can result in a marked improvement in fuel cell performance characteristics.
    Type: Application
    Filed: April 25, 2018
    Publication date: November 8, 2018
    Inventors: Yuquan Zou, Scott McDermid, Massimiliano Cimenti, Shun-wen Amy Yang, Liviu Catoiu
  • Publication number: 20180198146
    Abstract: The performance of a solid polymer membrane electrolyte fuel cell under various operating conditions can be improved via use of electrodes comprising multiple layers of supported catalyst in which the layers comprise different catalyst loadings on their respective supports. Such an electrode comprises a first component catalyst layer adjacent the membrane electrolyte and a second component catalyst layer adjacent the first component layer. The loading of the catalyst in the first component layer is greater than that in the second component layer.
    Type: Application
    Filed: June 23, 2016
    Publication date: July 12, 2018
    Inventors: Scott MCDERMID, Harmeet CHHINA, Dorina MANOLESCU
  • Patent number: 9941523
    Abstract: Use of noble metal alloy catalysts, such as PtCo, as the cathode catalyst in solid polymer electrolyte fuel cells can provide enhanced performance at low current densities over that obtained from the noble metal itself. Unfortunately, the performance at high current densities has been relatively poor. However, using a specific bilayer cathode construction, in which a noble metal/non-noble metal alloy layer is located adjacent the cathode gas diffusion layer and a noble metal layer is located adjacent the membrane electrolyte, can provide superior performance at all current densities.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: April 10, 2018
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Carmen Chuy, Scott McDermid, Herwig Haas, Rajeev Vohra, Mike Davis
  • Publication number: 20170309924
    Abstract: In solid polymer electrolyte fuel cells, an oxygen evolution reaction (OER) catalyst may be incorporated at the anode along with the primary hydrogen oxidation catalyst for purposes of tolerance to voltage reversal. Incorporating this OER catalyst in a layer at the interface between the anode's primary hydrogen oxidation anode catalyst and its gas diffusion layer can provide greatly improved tolerance to voltage reversal for a given amount of OER catalyst. Further, this improvement can be gained without sacrificing cell performance.
    Type: Application
    Filed: July 13, 2017
    Publication date: October 26, 2017
    Inventors: Sumit Kundu, Scott McDermid, Amy Shun-Wen Yang, Liviu Catoiu, Darija Susac
  • Publication number: 20170179497
    Abstract: Simplified methods for preparing a catalyst coated membrane (CCM) for solid polymer electrolyte fuel cells. The CCM has two reinforcing, expanded polymer sheets and the methods involve forming the electrolyte membrane from ionomer solution during assembly of the CCM. Thus, the conventional requirement to obtain, handle, and decal transfer solid polymer sheets in CCM preparation can be omitted. Further, CCM structures with improved mechanical strength can be prepared by orienting the expanded polymer sheets such that the stronger tensile strength direction of one is orthogonal to the other. Such improved CCM structures can be fabricated using the simplified methods.
    Type: Application
    Filed: December 12, 2016
    Publication date: June 22, 2017
    Inventors: Yuquan Zou, Owen Thomas, Scott McDermid, Yunsong Yang, Jing Li, Carmen Chuy
  • Patent number: 9397357
    Abstract: A membrane electrode assembly for a fuel cell is disclosed, which comprises at least one porous ionomer containing layer disposed at the interface between the cathode electrocatalyst material and the ion exchange membrane of the fuel cell. The porous ionomer containing layer comprises a catalyst migration impeding compound. The membrane electrode assembly exhibits improved stability against Pt dissolution and Pt-band formation within the ion exchange membrane, hence having improved durability and lifetime performance.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: July 19, 2016
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Dmitri Bessarabov, Sumit Kundu, Stephen Lee, Scott McDermid
  • Publication number: 20160156054
    Abstract: A membrane electrode assembly for a fuel cell, with a membrane, a catalyst layer (16) and a gas diffusion layer. The catalyst layer (16) has a first side facing the membrane and a second side facing the gas diffusion layer. In the catalyst layer (16) an ionomer content increases towards the membrane. The catalyst layer (16) has a first sublayer (22) in which catalyst particles (26) are coated with a first ionomer (28). The catalyst layer (16) further has a second sublayer (24) with a second ionomer (32) which is closer to the membrane than the first sublayer (22). Pores (30) are present at least between the coated catalyst particles (26). Further, a method for preparing such a membrane electrode assembly, a fuel cell system and a vehicle with a fuel cell system.
    Type: Application
    Filed: November 24, 2015
    Publication date: June 2, 2016
    Inventors: Carmen Chuy, Scott McDermid, Kyoung Bai, Tran Ngo
  • Patent number: 8758955
    Abstract: Ligand additives having two or more coordination sites in close proximity can be used in the polymer electrolyte of membrane electrode assemblies in solid polymer electrolyte fuel cells in order to reduce the dissolution of catalyst, particularly from the cathode, and hence reduce fuel cell degradation over time.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: June 24, 2014
    Assignees: Daimler AG, Ford Motor Company
    Inventors: Jing Li, Keping Wang, Yunsong Yang, Scott McDermid, Sumit Kundu
  • Publication number: 20130022890
    Abstract: In solid polymer electrolyte fuel cells, an oxygen evolution reaction (OER) catalyst may be incorporated at the anode along with the primary hydrogen oxidation catalyst for purposes of tolerance to voltage reversal. Incorporating this OER catalyst in a layer at the interface between the anode's primary hydrogen oxidation anode catalyst and its gas diffusion layer can provide greatly improved tolerance to voltage reversal for a given amount of OER catalyst. Further, this improvement can be gained without sacrificing cell performance.
    Type: Application
    Filed: July 17, 2012
    Publication date: January 24, 2013
    Applicants: Ford Motor Company, Daimler AG
    Inventors: Sumit Kundu, Scott McDermid, Amy Shun-Wen Yang, Liviu Catoiu, Darija Susac
  • Publication number: 20130022891
    Abstract: Use of noble metal alloy catalysts, such as PtCo, as the cathode catalyst in solid polymer electrolyte fuel cells can provide enhanced performance at low current densities over that obtained from the noble metal itself. Unfortunately, the performance at high current densities has been relatively poor. However, using a specific bilayer cathode construction, in which a noble metal/non-noble metal alloy layer is located adjacent the cathode gas diffusion layer and a noble metal layer is located adjacent the membrane electrolyte, can provide superior performance at all current densities.
    Type: Application
    Filed: July 17, 2012
    Publication date: January 24, 2013
    Applicants: FORD MOTOR COMPANY, DAIMLER AG
    Inventors: Carmen Chuy, Scott McDermid, Herwig Haas, Rajeev Vohra, Mike Davis
  • Publication number: 20120258382
    Abstract: Ligand additives having two or more coordination sites in close proximity can be used in the polymer electrolyte of membrane electrode assemblies in solid polymer electrolyte fuel cells in order to reduce the dissolution of catalyst, particularly from the cathode, and hence reduce fuel cell degradation over time.
    Type: Application
    Filed: April 7, 2011
    Publication date: October 11, 2012
    Applicants: Ford Motor Company, Daimler AG
    Inventors: Jing Li, Keping Wang, Yunsong Yang, Scott McDermid, Sumit Kundu
  • Publication number: 20110318662
    Abstract: The present disclosure relates to a catalyst including platinum phosphide having a cubic structure, a method of making the catalyst, and a fuel cell utilizing the catalyst. The present disclosure also relates to method of making electrical power utilizing a PEMFC incorporating the catalyst. Also disclosed herein is a catalyst including a platinum complex wherein platinum is complexed with a nonmetal or metalloid. The catalyst with the platinum complex can exhibit good electro-chemically active properties.
    Type: Application
    Filed: March 12, 2010
    Publication date: December 29, 2011
    Applicants: FORD MOTOR COMPANY, DAIMLER AG
    Inventors: Natalia Kremliakova, Scott McDermid, Stephen Campbell
  • Publication number: 20110256466
    Abstract: A membrane electrode assembly for a fuel cell is disclosed, which comprises at least one porous ionomer containing layer disposed at the interface between the cathode electrocatalyst material and the ion exchange membrane of the fuel cell. The porous ionomer containing layer comprises a catalyst migration impeding compound. The membrane electrode assembly exhibits improved stability against Pt dissolution and Pt-band formation within the ion exchange membrane, hence having improved durability and lifetime performance.
    Type: Application
    Filed: April 15, 2011
    Publication date: October 20, 2011
    Applicants: FORD MOTOR COMPANY, DAIMLER AG
    Inventors: Dmitri Bessarabov, Sumit Kundu, Stephen Lee, Scott McDermid
  • Publication number: 20070214962
    Abstract: Fluorination of a porous hydrocarbon-based polymer for use as a composite membrane and, more particularly, for use as a composite proton exchange membrane for a fuel cell. The composite membrane is formed by fluorination of the porous hydrocarbon-based polymer to yield a selectively fluorinated polymer, which is then loaded with an ionomer to yield the composite membrane.
    Type: Application
    Filed: March 15, 2007
    Publication date: September 20, 2007
    Inventors: Paul Kozak, Cindy Mah, Scott McDermid
  • Publication number: 20070202392
    Abstract: An electrocatalyst composition for use in an electrochemical fuel cell is disclosed. The electrocatalyst composition comprises (1) an electrocatalyst support comprising a carbon-containing species and at least one hydrogen peroxide and/or oxygen radical decomposition catalyst, and (2) a noble metal electrocatalyst supported on the electrocatalyst support. In addition, the at least one hydrogen peroxide and/or oxygen radical decomposition catalyst comprises transition metal inclusions within the electrocatalyst support, and the electrocatalyst support does not comprise any nitrogen-containing species or metal oxides.
    Type: Application
    Filed: March 5, 2007
    Publication date: August 30, 2007
    Inventors: Guy Faubert, Ping He, Scott McDermid, Myles Bos, Rajeev Vohra
  • Publication number: 20070154764
    Abstract: A water insoluble additive for improving the performance of an ion-exchange membrane, such as in the context of the high temperature operation of electrochemical fuel cells. The insoluble additive comprises a metal oxide cross-linked matrix having proton conducting groups covalently attached to the matrix through linkers. In one embodiment, the metal is silicon and the cross-linked matrix is a siloxane cross-linked matrix containing silicon atoms cross-linked by multiple disiloxy bonds and having proton conducting groups covalently attached to the silicon atoms through alkanediyl linkers.
    Type: Application
    Filed: December 20, 2006
    Publication date: July 5, 2007
    Inventors: Sean MacKinnon, Scott McDermid, Lukas Bonorand, Timothy Peckham, Keping Wang, Jing Li
  • Publication number: 20050136314
    Abstract: A membrane electrode assembly has two gas diffusion layers, two catalyst layers and an ion-exchange membrane interposed therebetween wherein the ion-exchange membrane is cast from a sulphonated polyether ketone/sulfone ionomer. Specifically, the ionomer can be represented as A-B-C wherein Further x, y, z represent the mole ratios of each moiety in the ionomer such that x is between 0.25 and 0.40; y is between 0.01 and 0.26; and z is between 0.40 and 0.67. Melt viscosity of the corresponding base polymer also affects performance in the fuel cell, particularly at values over 0.4 kNsm?2 as measured at 400° C., 1000 s?1. In preparing the membrane electrode assembly, the catalyst layers may be coated directly on the membrane and then bonded with two gas diffusion layers.
    Type: Application
    Filed: December 17, 2003
    Publication date: June 23, 2005
    Applicant: Ballard Power Systems Inc.
    Inventors: Charles Stone, Cindy Mah, Paul Meharg, Sean MacKinnon, Scott McDermid, Stephen Hamada, Miho Hall