ELECTRODE UNIT AND REDOX FLOW CELL

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