Volkswagen Ag

Audi Ag

Leland Stanford Junior University

Sebastian Kirsch

Lasse Schmidt

Patrick Zihrul

Ingmar Hartung

Friedrich B Prinz

Thomas Schladt

Hannes Scholz

Gerold Hübner

Shicheng Xu

Jonathan Edward Mueller

Maren Ramona Kirchhoff

Gerold Huebner

Tanja Graf

Vedran Glavas

A manufacturing process includes: depositing a catalyst support on a gas diffusion layer to form a catalyst support-coated gas diffusion layer; depositing a catalyst on the catalyst support-coated gas diffusion layer to form a catalyst-coated gas diffusion layer; and depositing an ionomer on the catalyst-coated gas diffusion layer to form an ionomer-coated gas diffusion layer. A membrane electrode assembly for a fuel cell includes: a gas diffusion layer; a polymer electrolyte membrane; and a catalyst layer disposed between the gas diffusion layer and the polymer electrolyte membrane, wherein the catalyst layer includes an ionomer, and a concentration of the ionomer varies within the catalyst layer according to a concentration profile.

Catalyst layer with extended surface area and method of forming such catalyst layer for polymer electrolyte fuel cells

A fuel cell system includes a fuel cell stack formed from a plurality of cell units, which have gas diffusion layers, wherein the gas diffusion layer of at least one of the edge cell units has a heat transfer mechanism of reduced efficiency in comparison with the gas diffusion layer of a cell unit from the middle of the fuel cell stack. A motor vehicle may include such a fuel cell system.

Fuel cell system having improved gas diffusion layers and motor vehicle having a fuel cell system

A diagnostic system for determining the cathode gas quality of a fuel cell system has a fuel cell stack, with a diagnostic fuel cell which can be connected at the cathode side to a cathode supply line and at the anode side to an anode supply line of the fuel cell system. The diagnostic system furthermore comprises a detection unit which is configured to detect a measured value or the measured value time curve of the diagnostic fuel cell operating with the cathode gas provided via the cathode supply line and with the anode gas provided via the anode supply line. The present disclosure moreover relates to a fuel cell system having a diagnostic system, and to a corresponding method.

Diagnostic system, fuel cell system having a diagnostic system, and method for determining cathode gas contamination

A method for starting a fuel cell and to a fuel cell system which is configured to carry out the method. The fuel cell includes electrically conductive bipolar plates, arranged between which there is in each case a cathode, including a fluid-conducting cathode space, a membrane and an anode, including a fluid-conducting anode space. There is provision that the method includes the following steps in the specified order:

Method for starting a fuel cell and fuel cell system

A method for controlling an operating point change of a fuel cell stack () operated with an anode operating medium and with a cathode operating medium, in which the fuel cell stack () is controlled in such a way that, starting from an initial electric power (L), the fuel cell stack generates a target power (L) requested by an electrical consumer (), which is greater than the initial power (L) is provided. It is provided that the electric power generated by the fuel cell stack () is controlled in accordance with a predetermined current-voltage profile (S, S, S), so that a voltage present at the fuel cell stack (), starting from an initial voltage (U) corresponding to the initial power (L), passes through a local voltage minimum (U) and then increases to an end voltage corresponding to the target power (L).

Method for controlling an operating point change of a fuel cell stack and a fuel cell system

Growing community of inventors

Sassenburg, Germany

Sebastian Kirsch