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    Electrochemical hydrogen sensor for global/local hydrogen starvation detection in PEM fuel cells
    6.
    发明授权
    Electrochemical hydrogen sensor for global/local hydrogen starvation detection in PEM fuel cells 有权

    公开(公告)号：US10193173B2

    公开(公告)日：2019-01-29

    申请号：US14804706

    申请日：2015-07-21

    Applicant: GM Global Technology Operations LLC

    Inventor： Jingxin Zhang ,  Balasubramanian Lakshmanan ,  Manish Sinha

    IPC: H01M8/04 ,  H01M8/06 ,  G01N27/403 ,  H01M8/0444 ,  H01M8/04858 ,  H01M8/0656 ,  H01M8/04791

    Abstract: A fuel cell stack hydrogen starvation detection device, a fuel cell system and a method of operating a fuel cell stack to protect it from hydrogen starvation conditions. In one particular form, the fuel cell system includes a stack of fuel cells, a controller and a detection device made up of one or more sensors that can compare a reference signal corresponding to the presence of substantially pure hydrogen to a signal that corresponds to a local hydrogen value within a single fuel cell within the stack or across multiple fuel cells within the stack. In this way, the detection device promptly provides indicia of a hydrogen starvation condition within the cell or stack without the need for conventional cell voltage monitoring. The detected hydrogen starvation condition may be presented as a warning signal to alert a user that such a condition may be present, as well as to the controller for modification of the stack operation.

    Fuel cell stack break-in procedures and break-in conditioning systems
    7.
    发明授权
    Fuel cell stack break-in procedures and break-in conditioning systems 有权

    公开(公告)号：US10158128B2

    公开(公告)日：2018-12-18

    申请号：US15451893

    申请日：2017-03-07

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jingxin Zhang ,  Nagappan Ramaswamy ,  Balasubramanian Lakshmanan ,  Swaminatha P. Kumaraguru

    IPC: H01M8/04 ,  H01M8/04119 ,  H01M8/04828 ,  H01M8/04223 ,  H01M8/04225 ,  H01M8/04302

    Abstract: Disclosed are fuel cell stack break-in procedures, conditioning systems for performing break-in procedures, and motor vehicles with a fuel cell stack conditioned in accordance with disclosed break-in procedures. A break-in method is disclosed for conditioning a membrane assembly of a fuel cell stack. The method includes transmitting humidified hydrogen to the anode of the membrane assembly, and transmitting deionized water to the cathode of the membrane assembly. An electric current and voltage cycle are applied across the fuel cell stack while the fuel cell stack is operated in a hydrogen pumping mode until the fuel cell stack is determined to operate at a predetermined threshold for a fuel cell stack voltage output capability. During hydrogen pumping, the membrane assembly oxidizes the humidified hydrogen, transports protons from the anode to the cathode across the proton conducting membrane, and regenerates the protons in the cathode through a hydrogen evolution reaction.

    Cell reversal diagnostics for a fuel cell stack
    8.
    发明授权
    Cell reversal diagnostics for a fuel cell stack 有权

    公开(公告)号：US10971745B2

    公开(公告)日：2021-04-06

    申请号：US15866599

    申请日：2018-01-10

    Applicant: GM Global Technology Operations LLC

    Inventor： Manish Sinha ,  Jingxin Zhang ,  Andrew J. Maslyn

    IPC: H01M8/04664 ,  H01M8/04992 ,  H01M8/04537 ,  H01M8/04746 ,  H01M8/04858 ,  B60L11/18 ,  H01M8/0432 ,  H01M8/04223 ,  B60L58/30

    Abstract: A fuel cell reversal event is diagnosed by integrating current density via a controller in response to determine an accumulated charge density. The controller executes a control action when the accumulated charge density exceeds a threshold, including recording a diagnostic code indicative of event severity. The control action may include continuing stack operation at reduced power capability when the accumulated charge density exceeds a first threshold and shutting off the stack when the accumulated charge density exceeds a higher second threshold. The event may be detected by calculating a voltage difference between an average and a minimum cell voltage, and then determining if the difference exceeds a voltage difference threshold. The charge density thresholds may be adjusted based on age, state of health, and/or temperature of the fuel cell or stack. A fuel cell system includes the stack and controller.

    Membrane Electrode Assemblies And Fuel-Cell Systems With Surface-Modified Electrocatalysts And Methods For Electrocatalyst Surface Modification
    10.
    发明申请
    Membrane Electrode Assemblies And Fuel-Cell Systems With Surface-Modified Electrocatalysts And Methods For Electrocatalyst Surface Modification 有权
    膜电极组件和表面改性电催化剂的燃料电池系统及电催化剂表面改性方法

    公开(公告)号：US20130260267A1

    公开(公告)日：2013-10-03

    申请号：US13799040

    申请日：2013-03-13

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jingxin Zhang ,  Rohit Makharia ,  Jeanette E. Owejan

    IPC: H01M4/86 ,  H01M4/92 ,  H01M8/06 ,  H01M4/90 ,  H01M8/10 ,  H01M4/88

    CPC classification number: H01M4/8657 ,  H01M4/8878 ,  H01M4/9008 ,  H01M4/923 ,  H01M8/0662 ,  H01M8/10 ,  H01M8/1007 ,  Y02E60/50 ,  Y02E60/521

    Abstract: Fuel-cell assemblies containing a membrane electrode assembly, methods for preparing the membrane electrode assembly, and methods for functionalizing catalytic surfaces of catalyst particles in the membrane electrode assembly of the fuel cell assembly have been described. The fuel-cell assemblies and their membrane electrode assemblies contain cathode catalyst materials having catalytic surfaces that are functionalized with cyano groups to improve catalyst activity. The cathode catalyst materials may include a catalytic metal such as platinum or a platinum alloy. The cyano groups may be derived from a cyanide source that is electro-oxidized onto the catalytic surfaces. Nonlimiting examples of cyanide sources include amino acids such as glycine, alanine, and serine. The cyano groups may improve catalyst activity toward the oxygen-reduction reaction in a hydrogen fuel cell by blocking catalyst surface adsorption of contaminant species such as sulfates or sulfonates while allowing access of oxygen molecules to the catalyst surface.

    Abstract translation: 已经描述了包含膜电极组件的燃料电池组件，用于制备膜电极组件的方法以及用于官能化燃料电池组件的膜电极组件中的催化剂颗粒的催化表面的方法。 燃料电池组件及其膜电极组件包含阴极催化剂材料，其具有用氰基官能化以提高催化剂活性的催化表面。 阴极催化剂材料可以包括催化金属如铂或铂合金。 氰基可以衍生自在催化表面上被电氧化的氰化物源。 氰化物源的非限制性实例包括氨基酸，例如甘氨酸，丙氨酸和丝氨酸。 氰基可以通过阻止诸如硫酸盐或磺酸盐的污染物质的催化剂表面吸附同时允许氧分子进入催化剂表面来改善氢燃料电池中的氧还原反应的催化剂活性。

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