Abstract: A layer, in particular for forming an electrically conductive plate for an electrochemical cell, wherein the layer contains a first chemical element from the group of precious metals in the form of ruthenium in a concentration in the range of 50 to 99 at. % and at least a second chemical element in the form of silicon in a concentration of <10 at. %. Furthermore, a layer system, an electrically conductive plate and an electrochemical cell are provided.

Abstract: A layer system (1) for coating a bipolar plate (2), including at least one cover layer (1a) made of tin oxide, wherein at least one metal oxide of the group comprising tantalum oxide, niobium oxide, titanium oxide, zirconium oxide, and hafnium oxide is homogenously dissolved in the tin oxide, and the electric conductivity of the cover layer (1a) is greater than or equal to 102 S/cm. A bipolar plate (2, 2?) is also provided with an anode side and a cathode side, comprising a substrate (2a, 2a?) and such a layer system (1), and to a fuel cell (10) or an electrolyzer comprising such a bipolar plate (2, 2?).

Abstract: A layer system for coating a metal substrate in order to form a flow field plate includes at least one cover layer made of metal oxide; at least one intermediate layer, which supports the cover layer; and a lower layer, which supports the intermediate layer(s). The cover layer is formed of indium tin oxide; wherein the indium tin oxide is optionally doped with at least one element from the group comprising carbon, nitrogen, boron, fluorine, hydrogen, silicon, titanium, tin and zirconium. At least one intermediate layer is formed of titanium nitride and/or titanium carbide and/or titanium carbonitride and/or titanium niobium nitride and/or titanium niobium carbide and/or titanium niobium carbonitride and/or chromium nitride and/or chromium carbide and/or chromium carbonitride. The lower layer is formed of titanium or a titanium-niobium alloy or chromium.

Abstract: An electrode unit (1, 1a, 1b), in particular for a redox flow cell (8), including at least one metallic substrate (2) and a coating (3) which is applied to the substrate (2), wherein the coating (3) includes at least one protective layer (4) which is formed from titanium-niobium nitride (TiNbN) and/or titanium-niobium carbide (TiNbC). A redox flow cell (8), in particular a redox flow battery, having at least one such electrode unit (1, 1a, 1b) is also provided.

Abstract: A fuel cell or an electrolyser includes at least one electrode and at least one polymer electrolyte membrane. The electrode includes a catalyst system comprising a carrier metal oxide and a catalyst material. The catalyst material is formed by an electrically conductive metal phosphate in the form of a metaphosphate of the general chemical formula Mezn+2(PnO3n+1)z, where Me=metal, z=valency of the metal Me, and n is within the range of 1 to 10.

Abstract: The invention relates to a catalyst system (9), an electrode (1) which comprises the catalyst system (9), and a fuel cell (10) or an electrolyzer having at least one such electrode (1). The catalyst system (9) comprises an electrically conductive carrier metal oxide and an electrically conductive, metal oxide catalyst material. A near-surface pH value, called pzzp value (pzzp=point of zero zeta potential), of the carrier metal oxide and the catalyst material differ. The catalyst material and the carrier metal oxide form an at least two-phase disperse oxide composite. The carrier metal oxide has a first crystal lattice structure comprising first oxygen lattice sites and first metal lattice sites, wherein the carrier metal oxide on the first oxygen lattice sites is preferably doped with at least one element from the group comprising nitrogen, carbon, and boron, and is optionally additionally doped with hydrogen.

Abstract: A catalyst system comprises an electrically conductive carrier metal oxide and an electrically conductive, metal oxide catalyst material, wherein the carrier metal oxide and the catalyst material differ in their composition and wherein the catalyst material and the carrier metal oxide are each stabilized with fluorine. A near-surface pH value, designated pzzp value (pzzp=point of zero zeta potential), of the carrier metal oxide and of the catalyst material differ from one another, wherein the pzzp value of either the carrier metal oxide or the catalyst material is at most pH=5. The catalyst material and the carrier metal oxide form an at least two-phase disperse oxide composite. The catalysts system may be used in an electrode which may be used in a fuel cell or an electrolyzer.

Abstract: A catalytic arrangement for an electrolyzer system or a fuel cell system includes a catalyst support unit and a catalyst layer, wherein the catalyst layer has a carbon matrix with a metal, non-metal and/or metalloid doping.

Abstract: Energy storage is accomplished by producing hydrazine carbonate and later reconverting the hydrazine carbonate to release the energy. Sea water is firstly used in an electrolysis process to prepare hypochlorite. The hypochlorite reacts as a result of introduction of ammonia to produce monochloramine and then hydrazine. The hydrazine reacts as a result of introduction of carbon dioxide to give hydrazine carbonate. To release the energy, the hydrazine carbonate liberates hydrogen or at least a hydrogen-containing gas by reaction over a noble metal-free catalyst. The hydrogen may then be enriched before being fed to a fuel cell.

Abstract: A method for producing components, in particular for energy systems such as fuel cells or electrolyzers, has the following steps: rolling-off a metal sheet having a thickness of less than 500 ?m, from a first roll; transporting the metal sheet through at least one coating plant in which the metal sheet is coated on at least one side by means of a physical and/or chemical vapor deposition process; performance of at least one forming process on the coated metal sheet; formation of a plurality of components by parting from the coated metal sheet; and rolling-up of the remaining coated metal sheet to give a second roll, with continuous transport of the metal sheet from the first roll to the second roll being carried out.

Abstract: Energy storage is accomplished by producing hydrazine carbonate and later reconverting the hydrazine carbonate to release the energy. Sea water is firstly used in an electrolysis process to prepare hypochlorite. The hypochlorite reacts as a result of introduction of ammonia to produce monochloramine and then hydrazine. The hydrazine reacts as a result of introduction of carbon dioxide to give hydrazine carbonate. To release the energy, the hydrazine carbonate liberates hydrogen or at least a hydrogen-containing gas by reaction over a noble metal-free catalyst. The hydrogen may then be enriched before being fed to a fuel cell.