Schematic of an iron reduction-oxidation cycle for energy storage, transport and use
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Schematic of an iron reduction-oxidation cycle for energy storage, transport and use. Iron and iron oxides are used in a reduction-oxidation cycle as carbon-free carrier of renewable energy. Left: renewable energy is used to reduce iron oxides via electrochemical (i.e., electrolysis) or thermochemical processes (i.e., reacting oxides with green hydrogen), storing the energy. Right: iron is used as a fuel in a combustor to release heat, e.g. in a power plant, to generate electricity, similarly to the traditional combustion of solid fuels. Solid iron oxides (FexOy) can be collected and transported to the reduction facilities, closing the cycle.
DFG subject classification404-01 Energieverfahrenstechnik
Clean Circles 
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