Multi-step chemical cycles that split water using heat, such as the copper-chlorine, iron oxide, zinc-zinc oxide, ceria-based and hybrid sulfur cycles. A technology belongs here when its cited article describes a thermochemical cycle for hydrogen. Each cycle reaches hydrogen through a series of chemical steps that are heated and cooled repeatedly, with the reagents recycled and only water consumed, which is why they are studied with high-temperature heat sources such as solar concentrators and nuclear reactors. A cycle is placed here by the cited article.
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Thermochemical Water-Splitting Cycles
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Copper-chlorine cycle, Wikipedia
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The copper-chlorine cycle (Cu-Cl cycle) is a four-step thermochemical cycle for the production of hydrogen.
Iron oxide cycle, Wikipedia
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For chemical reactions, the iron oxide cycle (Fe3O4/FeO) is the original two-step thermochemical cycle proposed for use for hydrogen production.
Zinc-zinc oxide cycle, Wikipedia
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For chemical reactions, the zinc-zinc oxide cycle or Zn-ZnO cycle is a two step thermochemical cycle based on zinc and zinc oxide for hydrogen production with a typical efficiency around 40%.
Wikipedia: Ceria based thermochemical cycles
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A ceria based thermochemical cycle is a type of two-step thermochemical cycle that uses as oxygen carrier cerium oxides (
Wikipedia: Hybrid sulfur cycle
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The hybrid sulfur cycle (HyS) is a two-step water-splitting process intended to be used for hydrogen production.
Wikipedia: Thermochemical cycle
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In chemistry, thermochemical cycles combine solely heat sources (thermo) with chemical reactions to split water into its hydrogen and oxygen components.
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