ABSTRACT
Both secondary energies, electricity and hydrogen, have much in common: they are technology driven; they are produced from any available primary energy; once produced, they are environmentally and climatically clean over the entire length of their respective conversion chains, from production via storage and transport to dissemination and ‚nally utilization; they are electrochemically interchangeable via electrolyses and fuel cells; they rely on each other, for example, when electrolyzers and lique‚ers need electricity or when electricity-providing low-temperature fuel cells need hydrogen as their fuel; in cases of secondary energy transport over longer distances, they compete with each other; in combined fossil fuel cycles, they are produced in parallel exergetically and highly ef‚ciently; hydrogen, in addition to electricity, helps exergizing the energy system and, thus, maximizing the available technical work.
