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

Gokon, Nobuyuki; Hasegawa, Tadahiro; Takahashi, Shogo; Kodama, Tetsuya

doi:10.1016/j.energy.2008.04.011

Cited by 97 publications

(38 citation statements)

References 24 publications

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“…By simply coating the currently existing redox-inert honeycombs in STJ with Co 3 O 4 (or any other redox oxide system capable of operating within the particular temperature range) or eventually manufacturing them entirely of it, the current sensible solar heat storage concept implemented with chemically-inert porous ceramic structures can be transformed to a "hybrid" sensible-thermochemical one with enhanced efficiency. In fact such redox-oxide-coated [16,17] or redox-oxide-made [18,19] porous ceramic structures have been already employed in "Solar Chemistry" applications exploiting redox-oxide-based thermochemical cycles for the production of solar fuels. Honeycombs are characterized by their cpsi (cells per square inch) number and foams by their ppi (pores per linear inch) number: higher cpsi/ppi numbers mean "denser" structures with thinner channel walls/struts and more, but smaller, air flow channels per cross-section area unit, i.e.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

2015

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The enthalpy effects of reversible chemical reactions can be exploited for the so-called thermochemical storage of solar energy. Oxides of multivalent metals in particular, capable of being reduced and oxidized under air atmosphere with significant heat effects are perfect candidates for air-operated Concentrated Solar Power plants since in this case air can be used as both the heat transfer fluid and the reactant (O 2 ) and therefore can come to direct contact with the storage material (oxide). Based on the characteristics of the oxide redox pair Co 3 O 4 /CoO as a thermochemical heat storage medium and the advantages of porous ceramic structures like honeycombs and foams in heat exchange applications, the idea of employing such structures either coated with or entirely made of a redox material like Co 3 O 4 , as a hybrid sensible-thermochemical solar energy storage system in air-operated Concentrated Solar Power plants has been set forth and tested. At first, small-scale, redox-inert, cordierite foams and honeycombs were coated with Co 3 O 4 and tested for cyclic reduction-oxidation operation via Thermo-Gravimetric Analysis. Such Co 3 O 4 -coated supports exhibited repeatable operation within the temperature range 800-1000 o C for many cycles, employing all the redox material incorporated, even at very high redox oxide loading levels. To improve the volumetric heat storage capacity of such reactors, ceramic foams made entirely of Co 3 O 4 were manufactured. Such foams exhibited satisfactory structural integrity and were comparatively tested vs. the "plain" Co 3 O 4 powder and the Co 3 O 4 -coated, cordierite supports under the same cyclic redox conditions up to 15 consecutive cycles. The Co 3 O 4 -made porous foams were proved also capable of cyclic reductionoxidation, exploiting the entire amount of Co 3 O 4 used in their manufacture, maintaining simultaneously their structural integrity.

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Section: Introductionmentioning

confidence: 99%

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

2015

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“…Hydrogen production from two-step solar water splitting with metal oxides is one of the most promising alternatives with higher efficiencies and lower costs. Several redox materials (Fe 3 O 4 /FeO [3,4], ZnO/Zn [5], Mn 3 O 4 [6]) have been evaluated for such applications, but their high splitting temperature (above 800 C) limits their practical applications on board hydrogen production for vehicle fuel cell.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of hydrogen production for micro fuel cell from activated Al–In mixture in water

Fan

Sun

2010

Energy

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“…Previous works have found considerable success doping iron oxide with a second metallic cation, such as Zn, Ni, Mn, or Co [15,[17][18][19][20][21][22]. Ferrites doped with Ni, Mn, or Co have exhibited an increase in reaction rates and have required lower temperatures for reduction [16,[23][24][25].…”

Section: International Journal Of Photoenergymentioning

confidence: 99%

“…Several distinct metal ferrites have been analyzed in the literature [5,15,16,20,22,24,26,27,32] in Figure S3 of the Supplementary Material. A portion of each sample was tested in the CO 2 splitting redox cycle via thermogravimetric analysis utilizing the same 5-cycle scheme as in the previous section.…”

Section: Doped Metal Ferrite Studymentioning

confidence: 99%

Effects of Dopant Metal Variation and Material Synthesis Method on the Material Properties of Mixed Metal Ferrites in Yttria Stabilized Zirconia for Solar Thermochemical Fuel Production

Leonard

Reyes

Allen

et al. 2015

International Journal of Photoenergy

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Mixed metal ferrites have shown much promise in two-step solar-thermochemical fuel production. Previous work has typically focused on evaluating a particular metal ferrite produced by a particular synthesis process, which makes comparisons between studies performed by independent researchers difficult. A comparative study was undertaken to explore the effects different synthesis methods have on the performance of a particular material during redox cycling using thermogravimetry. This study revealed that materials made via wet chemistry methods and extended periods of high temperature calcination yield better redox performance. Differences in redox performance between materials made via wet chemistry methods were minimal and these demonstrated much better performance than those synthesized via the solid state method. Subsequently, various metal ferrite samples (NiFe 2 O 4 , MgFe 2 O 4 , CoFe 2 O 4 , and MnFe 2 O 4 ) in yttria stabilized zirconia (8YSZ) were synthesized via coprecipitation and tested to determine the most promising metal ferrite combination. It was determined that 10 wt.% CoFe 2 O 4 in 8YSZ produced the highest and most consistent yields of O 2 and CO. By testing the effects of synthesis methods and dopants in a consistent fashion, those aspects of ferrite preparation which are most significant can be revealed. More importantly, these insights can guide future efforts in developing the next generation of thermochemical fuel production materials.

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

Cited by 97 publications

References 24 publications

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

Feasibility study of hydrogen production for micro fuel cell from activated Al–In mixture in water

Effects of Dopant Metal Variation and Material Synthesis Method on the Material Properties of Mixed Metal Ferrites in Yttria Stabilized Zirconia for Solar Thermochemical Fuel Production

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