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The Zn/ZnO cycle

The zinc-zinc oxide cycle or Zn/ZnO cycle is a two step thermochemical process based on zinc and zinc oxide[1] for hydrogen production[2] with a typical efficiency around 40%.[3]


Process description

The thermochemical two-step water splitting process uses redox systems[4]:

For the first endothermic step concentrating solar power is used in which zinc oxide is thermally dissociated at 1,900 °C (3,452 °F) into zinc and oxygen. In the second non-solar exothermic step zinc reacts at 427 °C (800.6 °F) with water and produces hydrogen and zinc oxide. The temperature level is realized by using a solar power tower and a set of heliostats to collect the solar thermal energy.

See also


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