The thermochemical two-step water splitting cycle was examined by using an iron oxide supported on yttrium-stabilized, cubic zirconia (YSZ) as the working material with a view toward direct conversion of solar high-temperature heat to clean hydrogen energy. In the first step of the cycle, the YSZ-supported was thermally decomposed to the reduced phase at under an inert atmosphere. The reduced solid phase was oxidized back to the original phase (the YSZ-supported ) with steam to generate hydrogen below . A new redox pair, which is different from the pair previously examined by others, served as the working solid material on this YSZ-supported . Our new redox reaction proceeded as follows. The reacted with YSZ to produce an -containing phase by releasing oxygen molecules in the first step: The ions entered into the cubic YSZ lattice. In the second step, the -containing YSZ generated hydrogen via steam splitting to reproduce on the cubic YSZ support. This cyclic reaction could be repeated with a good repeatability of the reaction below .
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