A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La 0.6 Sr 0.4 MnO 3 Perovskite during Solar Thermochemical Redox Cycling.
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| Title: | A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La 0.6 Sr 0.4 MnO 3 Perovskite during Solar Thermochemical Redox Cycling. |
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| Authors: | Lee, Kangjae1 (AUTHOR) anakin27@ufl.edu, Scheffe, Jonathan R.1 (AUTHOR) jscheffe@ufl.edu |
| Source: | Energies (19961073). Nov2020, Vol. 13 Issue 22, p5935. 1p. |
| Subject Terms: | *Cerium oxides, *Heating, *Strontium, *Perovskite, *Oxidation-reduction reaction, *Heat flux |
| Abstract: | Thermochemical processes are considered promising pathways to utilize solar energy for fuel production. Several physico-chemical, kinetic and thermodynamic properties of candidate oxides have been studied, yet their morphological stability during redox cycling under radiative heating is not widely reported. Typically when it is reported, it is for large-scale directly irradiated reactors (~1–10 kWth) aimed at demonstrating high efficiency, or in indirectly irradiated receivers where the sample surface is not exposed directly to extreme radiative fluxes. In this work, we aimed to emulate heat flux conditions expected in larger scale solar simulators, but at a smaller scale where experimentation can be performed relatively rapidly and with ease compared to larger prototype reactors. To do so, we utilized a unique infrared (IR) laser-based heating system with a peak heat flux of 2300 kW/m2 to drive redox cycles of two candidate materials, namely nonstoichiometric CeO2-δ and La0.6Sr0.4MnO3-δ. In total, 200 temperature-swing cycles using a porous ceria pellet were performed at constant pO2, and 5 cycles were performed for both samples by introducing H2O vapor into the system during reduction. Porous ceria pellets with porosity (0.55) and pore size (4–7 μm) were utilized because of their similarity to other porous structures utilized in larger-scale reactors. Overall, we observed that reaction extents initially decreased along with the decrease in reaction rates up to cycle 120 because of the change in structure and sintering. In the case of H2O splitting, ceria outperformed LSM40 in total H2 production because of the low pO2 during oxidation, where the oxidation of LSM40 is less favorable than that of ceria. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 147323186 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La 0.6 Sr 0.4 MnO 3 Perovskite during Solar Thermochemical Redox Cycling. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lee%2C+Kangjae%22">Lee, Kangjae</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> anakin27@ufl.edu</i><br /><searchLink fieldCode="AR" term="%22Scheffe%2C+Jonathan+R%2E%22">Scheffe, Jonathan R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jscheffe@ufl.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Nov2020, Vol. 13 Issue 22, p5935. 1p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Cerium+oxides%22">Cerium oxides</searchLink><br />*<searchLink fieldCode="DE" term="%22Heating%22">Heating</searchLink><br />*<searchLink fieldCode="DE" term="%22Strontium%22">Strontium</searchLink><br />*<searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br />*<searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Thermochemical processes are considered promising pathways to utilize solar energy for fuel production. Several physico-chemical, kinetic and thermodynamic properties of candidate oxides have been studied, yet their morphological stability during redox cycling under radiative heating is not widely reported. Typically when it is reported, it is for large-scale directly irradiated reactors (~1–10 kWth) aimed at demonstrating high efficiency, or in indirectly irradiated receivers where the sample surface is not exposed directly to extreme radiative fluxes. In this work, we aimed to emulate heat flux conditions expected in larger scale solar simulators, but at a smaller scale where experimentation can be performed relatively rapidly and with ease compared to larger prototype reactors. To do so, we utilized a unique infrared (IR) laser-based heating system with a peak heat flux of 2300 kW/m2 to drive redox cycles of two candidate materials, namely nonstoichiometric CeO2-δ and La0.6Sr0.4MnO3-δ. In total, 200 temperature-swing cycles using a porous ceria pellet were performed at constant pO2, and 5 cycles were performed for both samples by introducing H2O vapor into the system during reduction. Porous ceria pellets with porosity (0.55) and pore size (4–7 μm) were utilized because of their similarity to other porous structures utilized in larger-scale reactors. Overall, we observed that reaction extents initially decreased along with the decrease in reaction rates up to cycle 120 because of the change in structure and sintering. In the case of H2O splitting, ceria outperformed LSM40 in total H2 production because of the low pO2 during oxidation, where the oxidation of LSM40 is less favorable than that of ceria. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=147323186 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/en13225935 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: 5935 Subjects: – SubjectFull: Cerium oxides Type: general – SubjectFull: Heating Type: general – SubjectFull: Strontium Type: general – SubjectFull: Perovskite Type: general – SubjectFull: Oxidation-reduction reaction Type: general – SubjectFull: Heat flux Type: general Titles: – TitleFull: A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La 0.6 Sr 0.4 MnO 3 Perovskite during Solar Thermochemical Redox Cycling. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lee, Kangjae – PersonEntity: Name: NameFull: Scheffe, Jonathan R. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: Nov2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 19961073 Numbering: – Type: volume Value: 13 – Type: issue Value: 22 Titles: – TitleFull: Energies (19961073) Type: main |
| ResultId | 1 |
