Advances and trends in redox materials for solar thermochemical fuel production.
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| Title: | Advances and trends in redox materials for solar thermochemical fuel production. |
|---|---|
| Authors: | Carrillo, Richard J.1, Scheffe, Jonathan R.1 jscheffe@ufl.edu |
| Source: | Solar Energy. Nov2017, Vol. 156, p3-20. 18p. |
| Subjects: | Oxidation-reduction reaction, Solar thermal energy, Nonstoichiometric compounds, Fuel industry, Gas phase reactions, Solar energy |
| Abstract: | Solar thermochemical (STC) redox cycles have made substantial advances in recent years, in large part due to the utilization of nonstoichiometric ceria over other iron oxide and zinc oxide based materials that undergo crystallographic or solid-to-gas phase changes. These changes render their utilization in a cyclic nature to be challenging because of the ever-changing physical properties over time and difficulty in preventing reverse reactions when cooling, for example Zn(g) + 0.5O 2 (g) → ZnO(s). However, such phase changes also have the distinct benefit of being accompanied by large changes in entropy which is typically favorable from a thermodynamic perspective. As a result, the theoretical solar-to-fuel energy conversion efficiencies of ceria-based cycles are usually predicted to be lower than their volatile and nonvolatile stoichiometric counterparts; however, in actuality their measured performance is superior. For this technology to become commercially viable, there is a need to develop new materials that can outperform ceria in terms of solar-to-fuel energy conversion efficiency and operate at more benign conditions. This has been a large focus in the thermochemical community over the last 5–6 years and, to date, most of the effort has been centered on reducing the relatively high operating temperatures that are required while maintaining ceria’s desirable characteristics such as favorable oxidation thermodynamics, rapid reaction kinetics, and crystallographic stability. This effort resulted in many perovskite related materials that operate several hundred degrees lower (e.g. 1473 K). Unfortunately, however, their entropy change is usually lower than that of ceria and the results are consistently a compromise in the thermodynamic driving force for oxidation that results in less efficient materials overall. This work focuses on the thermodynamic, experimental, and computational aspects related to the discovery and characterization of new and better performing redox materials and the attributes necessary of them in order to drive the next generation of efficient STC redox materials. [ABSTRACT FROM AUTHOR] |
| Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 125924612 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Advances and trends in redox materials for solar thermochemical fuel production. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Carrillo%2C+Richard+J%2E%22">Carrillo, Richard J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Scheffe%2C+Jonathan+R%2E%22">Scheffe, Jonathan R.</searchLink><relatesTo>1</relatesTo><i> jscheffe@ufl.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Solar+Energy%22">Solar Energy</searchLink>. Nov2017, Vol. 156, p3-20. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+thermal+energy%22">Solar thermal energy</searchLink><br /><searchLink fieldCode="DE" term="%22Nonstoichiometric+compounds%22">Nonstoichiometric compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Fuel+industry%22">Fuel industry</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+phase+reactions%22">Gas phase reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+energy%22">Solar energy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Solar thermochemical (STC) redox cycles have made substantial advances in recent years, in large part due to the utilization of nonstoichiometric ceria over other iron oxide and zinc oxide based materials that undergo crystallographic or solid-to-gas phase changes. These changes render their utilization in a cyclic nature to be challenging because of the ever-changing physical properties over time and difficulty in preventing reverse reactions when cooling, for example Zn(g) + 0.5O 2 (g) → ZnO(s). However, such phase changes also have the distinct benefit of being accompanied by large changes in entropy which is typically favorable from a thermodynamic perspective. As a result, the theoretical solar-to-fuel energy conversion efficiencies of ceria-based cycles are usually predicted to be lower than their volatile and nonvolatile stoichiometric counterparts; however, in actuality their measured performance is superior. For this technology to become commercially viable, there is a need to develop new materials that can outperform ceria in terms of solar-to-fuel energy conversion efficiency and operate at more benign conditions. This has been a large focus in the thermochemical community over the last 5–6 years and, to date, most of the effort has been centered on reducing the relatively high operating temperatures that are required while maintaining ceria’s desirable characteristics such as favorable oxidation thermodynamics, rapid reaction kinetics, and crystallographic stability. This effort resulted in many perovskite related materials that operate several hundred degrees lower (e.g. 1473 K). Unfortunately, however, their entropy change is usually lower than that of ceria and the results are consistently a compromise in the thermodynamic driving force for oxidation that results in less efficient materials overall. This work focuses on the thermodynamic, experimental, and computational aspects related to the discovery and characterization of new and better performing redox materials and the attributes necessary of them in order to drive the next generation of efficient STC redox materials. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.solener.2017.05.032 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 3 Subjects: – SubjectFull: Oxidation-reduction reaction Type: general – SubjectFull: Solar thermal energy Type: general – SubjectFull: Nonstoichiometric compounds Type: general – SubjectFull: Fuel industry Type: general – SubjectFull: Gas phase reactions Type: general – SubjectFull: Solar energy Type: general Titles: – TitleFull: Advances and trends in redox materials for solar thermochemical fuel production. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Carrillo, Richard J. – PersonEntity: Name: NameFull: Scheffe, Jonathan R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 0038092X Numbering: – Type: volume Value: 156 Titles: – TitleFull: Solar Energy Type: main |
| ResultId | 1 |
