Thermochemical hydrogen production by a redox system of ZrO2-supported Co(II)-ferrite |
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| Authors: | T Kodama Y Kondoh R Yamamoto H Andou N Satou |
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| Affiliation: | a Department of Chemistry & Chemical Engineering, Faculty of Engineering, and Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan;b Technical Department, 1-1 Higashihamamachi, Yawatanishi-ku, Kitakyushu 806-8586, Japan;c Fine Ceramics Division, Krosakiharima Corporation, 1-1 Higashihamamachi, Yawatanishi-ku, Kitakyushu 806-8586, Japan |
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| Abstract: | The thermochemical two-step water splitting was examined on ZrO2-supported Co(II)-ferrites below 1400 °C, for purpose of converting solar high-temperature heat to clean hydrogen energy as storage and transport of solar energy. The ferrite on the ZrO2-support was thermally decomposed to the reduced phase of wustite at 1400 °C under an inert atmosphere. The reduced phase was reoxidized with steam on the ZrO2-support to generate hydrogen below 1000 °C in a separate step. The ZrO2-supporting alleviated the high-temperature sintering of iron oxide. As the results, the ZrO2-supported ferrite realized a greater reactivity and a better repeatability of the cyclic water splitting than the conventional unsupported ferrites. The CoxFe3−xO4/ZrO2 with the x value of around 0.4–0.7 was found to be the promising working material for the two-step water splitting when thermally reduced at 1400 °C under an inert atmosphere. |
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| Keywords: | Solar heat Energy conversion Hydrogen production Thermochemical water splitting Metal oxide |
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