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Review of the two-step thermochemical cycle performed with cerium-based oxides for solar fuels production

Lu, Youjun and Zhu, Liya and Agrafiotis, Christos and Vieten, Josua and Roeb, Martin and Sattler, Christian (2019) Review of the two-step thermochemical cycle performed with cerium-based oxides for solar fuels production. Progress in Energy and Combustion Science, 75, p. 100785. Elsevier. doi: 10.1016/j.pecs.2019.100785. ISSN 0360-1285.

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Official URL: https://www.sciencedirect.com/science/article/pii/S036012851830131X?via%3Dihub


Solar CO2/H2O splitting via two-step thermochemical cycles of metal oxides is a promising path for solar energy conversion to carbon-neutral, liquid hydrocarbons from virtually inexhaustible resources, water and (waste) carbon dioxide, with high theoretical efficiency potential. Cerium-based oxides have seen enormous interest and research efforts since they were proposed for this application, mainly due to their good stability at high temperatures and fast kinetics in redox reactions. The current state-of the-art review on the advancements of thermochemical cycles performed with the aid of cerium-based oxides is presented in this work, with emphasis on the latest developments during the last decade. Reaction principles, material modifications, reaction kinetics and finally solar reactors developed and operated are discussed in detail to provide a comprehensive understanding of the nature of the specific material and the factors impacting on the system efficiency. This efficiency depends on a combination of redox material/solar reactor/operation mode. With respect to the material issue, even though most studies have been targeted on improving the reduction conditions by suitable doping (e.g. Zr and Hf), the experience accumulated so far points to the direction of improving the oxidation step, provided the reduction step is performed below a critical, operationally feasible temperature. Thus the efficiency-optimal solar operation mode should be based on a trade-off between material reduction and oxidation performance and on another trade-off between solid and gas heat requirements and suitable recuperation strategies. The latter are highly dependent on the concept of solar reactor chosen and have to be demonstrated efficiently in real cyclic, field-test operation. The development of more effective oxygen removal strategies to lower the oxygen partial pressure during reduction may bring great improvement to efficiency.

Item URL in elib:https://elib.dlr.de/131030/
Document Type:Article
Title:Review of the two-step thermochemical cycle performed with cerium-based oxides for solar fuels production
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lu, Youjunyjlu (at) mail.xjtu.edu.cnUNSPECIFIED
Zhu, LiyaLiya.Zhu (at) dlr.deUNSPECIFIED
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Vieten, JosuaJosua.Vieten (at) dlr.dehttps://orcid.org/0000-0002-2060-2039
Roeb, MartinMartin.roeb (at) dlr.dehttps://orcid.org/0000-0002-9813-5135
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:11 July 2019
Journal or Publication Title:Progress in Energy and Combustion Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.pecs.2019.100785
Page Range:p. 100785
Keywords:Ceria; Thermochemical cycle; Redox oxide; Solar fuel; Solar reactor; Material modification; Kinetics; Efficiency
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:22 Nov 2019 15:35
Last Modified:22 Nov 2019 15:35

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