Thermochemical two-step water-splitting for hydrogen production using Fe-YSZ particles and a ceramic foam device

Nobuyuki Gokon, Tomoki Hasegawa, Shingo Takahashi and Tatsuya Kodama

Energy, 2008, vol. 33, issue 9, 1407-1416

Abstract: Fe3O4 supported on cubic yttria-stabilized zirconia (Fe3O4/c-YSZ) is proposed as a promising redox material for the production of hydrogen from water via a thermochemical two-step water-splitting cycle. In this study, the evolution of oxygen and hydrogen during the cyclic reaction was examined using Fe3O4/c-YSZ particles in order to demonstrate reproducible and stoichometric oxygen/hydrogen production through a repeatable two-step reaction. Subsequently, a ceramic foam device coated with Fe3O4 and c-YSZ particles was prepared and examined as a thermochemical water-splitting device in a directly irradiated receiver/reactor hydrogen production system. The Fe3O4/c-YSZ system formed a Fe-containing YSZ (Fe-YSZ) by high-temperature reaction between Fe3O4 and the c-YSZ support at 1400°C in an inert atmosphere. The reaction mechanism of the two-step water-splitting cycle is associated with the redox transition of Fe2+–Fe3+ ions in the c-YSZ lattice. The Fe-YSZ particles exhibit good reproducibility for reaction with a hydrogen/oxygen ratio of approximately 2.0 throughout repeated cycles. The foam device coated with Fe-YSZ particles was also successful for continual hydrogen production through 32 repeated cycles. A 20–27% ferrite conversion was obtained using 10.5wt% Fe3O4 loading over an irradiation period of 60min.

Keywords: Solar heat; Energy conversion; Hydrogen production; Thermochemical water-splitting; Ferrite cycle; Ceramic foam (search for similar items in EconPapers)
Date: 2008
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Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:33:y:2008:i:9:p:1407-1416

DOI: 10.1016/j.energy.2008.04.011

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