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Research Papers

Iron-Containing Yttria-Stabilized Zirconia System For Two-Step Thermochemical Water Splitting

[+] Author and Article Information
Nobuyuki Gokon1

Graduate School of Science and Technology,  Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan

Takayuki Mizuno, Yumiko Nakamuro

Graduate School of Science and Technology,  Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan

Tatsuya Kodama

Department of Chemistry and Chemical Engineering, Faculty of Engineering,  Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan

1

Corresponding author.

J. Sol. Energy Eng 130(1), 011018 (Dec 28, 2007) (6 pages) doi:10.1115/1.2807197 History: Received September 21, 2006; Revised May 30, 2007; Published December 28, 2007

An iron-containing yttria-stabilized zirconia (YSZ) or Fe-YSZ was found to be a promising working redox material for the thermochemical two-step water-splitting cycle. The Fe-YSZ was formed by a high-temperature reaction between YSZ doped with more than 8mol%Y2O3 and Fe3O4 supported on the YSZ at 1400°C in an inert atmosphere. The formed Fe-YSZ reacted with steam to generate hydrogen at 1000°C. The oxidized Fe-YSZ was reactivated by a thermal reduction at 1400°C in an inert atmosphere. The alternative O2 and H2 generations in the repeated two-step reactions and the X-ray diffraction and chemical analysis studies on the solid materials indicated that the two-step water splitting was associated with a redox transition between Fe2+Fe3+ ions in the cubic YSZ lattice.

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Figures

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Figure 1

Experimental setup for (a) the T-D step and (b) the W-D step

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Figure 2

XRD patterns of (a) the Fe3O4(18wt%)∕YSZ original, (b) that after the first heat treatment at 1400°C, and (c) that after W-D step at 1000°C

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Figure 3

Change in a (311) reflection peak of YSZ in XRD patterns of the Fe3O4(18wt%)∕YSZ original, that after the first heat treatment at 1400°C, and that after W-D step at 1000°C

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Figure 4

Oxygen evolution profile (Fe3O4(18wt%)∕YSZ) during the first heat treatment at 1400°C

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Figure 5

Variation of iron ion amount dissolved into HCl. Original sample (Fe3O4(20wt%)∕YSZ), solid materials formed after T-D step and W-D steps were dissolved into HCl solution, and the supernatants dissolving iron ions were chemically analyzed.

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Figure 6

Time variation of hydrogen production rate per weight of material (Fe3O4(18wt%)∕YSZ) during the W-D step of the first run at 1400°C

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Figure 7

Evolved hydrogen amounts per weight of material in the W-D step using Fe3O4∕YSZ with 8mol%Y2O3. Symbols: 10wt%Fe3O4∕YSZ (open diamonds), 18wt%Fe3O4∕YSZ (solid circles), 28wt%Fe3O4∕YSZ (open circles), and 17wt%Fe3O4∕YSZ with 10mol%Y2O3 (cross). The T-D step was performed at 1400°C.

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