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Research Papers

A Reactive Fe-YSZ Coated Foam Device for Solar Two-Step Water Splitting

[+] Author and Article Information
Tatsuya Kodama1

Department of Chemistry and Chemical Engineering, Niigata University, 8050 Ikarashi 2-Nocho, Niigata 950-2181, Japan

Tomoki Hasegawa, Nobuyuki Gokon

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

Ayumi Nagasaki

Department of Chemistry and Chemical Engineering, Niigata University, 8050 Ikarashi 2-Nocho, Niigata 950-2181, Japan

1

Corresponding author.

J. Sol. Energy Eng 131(2), 021008 (Apr 02, 2009) (7 pages) doi:10.1115/1.3090819 History: Received August 08, 2007; Revised December 17, 2007; Published April 02, 2009

A thermochemical two-step water-splitting cycle using a redox system of iron-based oxides or ferrites is one of the promising processes for converting solar energy into clean hydrogen in sunbelt regions. An iron-containing yttrium-stabilized zirconia (YSZ) or Fe-YSZ is a promising working redox material for the two-step water-splitting cycle. Fe2+-YSZ is formed by a high-temperature reaction between YSZ and Fe3O4 supported on the YSZ at 1400°C in an inert atmosphere. Fe2+-YSZ reacts with steam and generates hydrogen at 10001100°C to form Fe3+-YSZ that is reactivated by thermal reduction in a separate step at temperatures above 1400°C under an inert atmosphere. In the present study, ceramic foam coated with Fe-YSZ particles is examined as the thermochemical water-splitting device to be used in a solar directly irradiated receiver/reactor system. The Fe-YSZ particles were coated on an Mg-partially stabilized zirconia foam disk, and the foam device was tested during the two-step water-splitting cycle; this was performed alternately at temperatures between 1100°C and 1400°C. The foam device was irradiated by concentrated visible light from a sun simulator at a peak flux density of 925kW/m2 and an average flux density of 415kW/m2 (total power input on the surface of the foam was 0.296 kW) in a N2 gas stream; subsequently, it was reacted with steam at 1100°C while heating by an infrared furnace. Hydrogen successfully continued to be produced in the repeated cycles.

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Copyright © 2009 by American Society of Mechanical Engineers
Topics: Water , Cycles , Solar energy
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Figures

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Figure 1

Experimental setup for reactivity test of Fe3O4/YSZ and Fe3O4/m-ZrO2 powders for (a) the T-R step and (b) the W-D step

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Figure 2

Photographs of the (a) original foam disk made of MPSZ and the (b) Fe3O4/YSZ/MPSZ-foam device broken after the 13th cycle of repeated water splitting

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Figure 3

Experimental setup for the reactivity test of Fe3O4/YSZ/MPSZ-foam device (a) for the T-R step and (b) for the W-D step

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Figure 4

Flux density distribution of the incident solar-simulated light on the irradiated surface of the foam device

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Figure 5

Amounts of evolved H2 and Fe3O4 conversions in the W-D steps of the repetition test of the two-step water splitting for (a) Fe3O4/m-ZrO2 powder, (b) Fe3O4/8YSZ powder, and (c) Fe3O4/10YSZ powder samples. Two runs of the repetition test were performed for each sample. Solid circles and open squares indicate the first and second runs, respectively.

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Figure 6

Hydrogen evolution profiles of the W-D steps in the repetition test of the two-step water splitting with Fe3O4/YSZ/MPSZ-foam device for the (a) original MPSZ foam without applying the Fe3O4/YSZ and for the (b) 2nd, (c) 4th, (d) 6th, (e) 8th, (f) 10th, (g) 11th, (h) 12th, and (i) 13th cycles. The irradiation periods by solar-simulated light in the T-R steps were 30 min for 1st–5th cycle and 60 min for 6th–13th cycle.

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Figure 7

Evolved amounts of H2 and Fe3O4 conversions in the W-D steps of the repetition test of the two-step water splitting with Fe3O4/YSZ-MPSZ foam device. The irradiation periods by solar-simulated light in the T-R steps were 30 min for 1st–5th cycles (solid circles) and 60 min for 6th–13th cycles (open circles).

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