Abstract: A method includes (1) functionalizing a substrate to yield a functionalized substrate; and (2) depositing a catalyst on the functionalized substrate by atomic layer deposition to form a thin film of the catalyst covering the functionalized substrate.

Abstract: 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.

Abstract: In order to provide a membrane (100) for a membrane-electrode assembly (MEA) of a fuel cell, comprising two partial membranes (200, 300), which allows for a simpler water circuit compared to the prior art, it is proposed that the partial membranes (200, 300) have different ion exchange capacities (IECs) and/or one partial membrane (200) consists of a perfluorosulfonic acid polymer (PFSA) and the other partial membrane (300) consists of a sulfonated hydrocarbon polymer (HC). Optionally, the membrane can contain a porous carrier film (600). Moreover disclosed are a method for producing the membrane (100) as well as a membrane-electrode assembly and a fuel cell.

Abstract: A noble metal-free catalyst system with a carbon-based support material and a polyaniline-metal catalyst bound to the support material is provided. Moreover, fuel cell containing the catalyst system is provided. The polyaniline-metal catalyst -contains iron (Fe) and manganese (Mn).