Abstract: The invention relates to a metallic bipolar plate for use in an electrochemical cell, wherein the bipolar plate comprises an electrically conductive graphene-like coating. The graphene-like coating has a layer thickness between 10 nm and 1 ?m. Chemical synthesis is initially carried out to produce the graphene-like coating according to the invention comprising one or more at least partially reduced graphene oxide layers. Proceeding from graphite powder, a graphite oxide powder is initially produced, which is subsequently converted into a stable graphene oxide (GO) suspension by way of ultrasonic dispersion. By depositing this suspension on a metallic carrier substrate (bipolar plate), thin graphene oxide layers can then be applied and subsequently be reduced to obtain at least partially reduced graphene oxide (rGO), which is referred to as graphene-like. This coating advantageously has sufficient stability and the necessary electrical conductivity for use in an electrochemical cell.

Abstract: The invention relates to a metallic bipolar plate for use in an electrochemical cell, wherein the bipolar plate comprises an electrically conductive graphene-like coating. The graphene-like coating has a layer thickness between 10 nm and 1 ?m. Chemical synthesis is initially carried out to produce the graphene-like coating according to the invention comprising one or more at least partially reduced graphene oxide layers. Proceeding from graphite powder, a graphite oxide powder is initially produced, which is subsequently converted into a stable graphene oxide (GO) suspension by way of ultrasonic dispersion. By depositing this suspension on a metallic carrier substrate (bipolar plate), thin graphene oxide layers can then be applied and subsequently be reduced to obtain at least partially reduced graphene oxide (rGO), which is referred to as graphene-like. This coating advantageously has sufficient stability and the necessary electrical conductivity for use in an electrochemical cell.

Abstract: The invention relates to a gas distribution panel for a fuel cell wherein gas guiding channels having a meandering-shaped structure and which extend in a parallel manner are arranged. The invention is characterized in that cell connectors having various widths are provided on the meander-shaped defining channels in order to reduce transversal transportation of media along the meander-shaped defining channels. The invention also relates to a fuel cell provided with a gas distribution channel arranged on the cathode side and/or anode side, especially a polymer-electrolyte membrane (PEM) fuel cell.

Abstract: A fuel cell arrangement consisting of several fuel cells, arranged at least essentially in parallel, with cooling gaps formed between neighboring cells extending between an inlet and an outlet and through which a coolant flows, characterized by the fact that the specific surface, i.e. the area of the cooling surfaces emitting heat to the coolant, increases in the direction from the inlet to the outlet and/or that the local heat transfer coefficient of the cooling areas emitting heat to the coolant increases in the direction of flow from the inlet to the outlet and/or that the support materials of the fuel cells, i.e. the membrane-electrode assemblies, exhibit a coefficient of thermal conductivity above 200 W/(m·K). In this way, a uniform temperature in the fuel cells can be assured to that the power density can be increased while avoiding hot spots and/or the service life can be increased.

Abstract: A fuel cell arrangement consisting of several fuel cells, arranged at least essentially in parallel, with cooling gaps formed between neighboring cells extending between an inlet and an outlet and through which a coolant flows, characterized by the fact that the specific surface, i.e. the area of the cooling surfaces emitting heat to the coolant, increases in the direction from the inlet to the outlet and/or that the local heat transfer coefficient of the cooling areas emitting heat to the coolant increases in the direction of flow from the inlet to the outlet and/or that the support materials of the fuel cells, i.e. the membrane-electrode assemblies, exhibit a coefficient of thermal conductivity above 200 W/(m·K). In this way, a uniform temperature in the fuel cells can be assured to that the power density can be increased while avoiding hot spots and/or the service life can be increased.

Abstract: In a process for reheating flue gases originating in furnaces operated with fossils fuels, the flue gases, before being introduced into the chimney, receive heat energy that has been generated in a fluidized bed furnace. Sulfur binding agents are added to the fluidized bed furnace and the flue gases of the this furnace are added to the cleaned flue gases after removal of the suspended dust.