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Strategic co-doping of ceria for improved oxidation kinetics in solar thermochemical fuel production

Lee, Kangjae and Knoblauch, Nicole and Agrafiotis, Christos and Pein, Mathias and Roeb, Martin and Schmücker, Martin and Sattler, Christian (2023) Strategic co-doping of ceria for improved oxidation kinetics in solar thermochemical fuel production. Materials Today Energy, 35, pp. 1-11. Elsevier. doi: 10.1016/j.mtener.2023.101321. ISSN 2468-6069.

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Official URL: https://www.sciencedirect.com/science/article/pii/S2468606923000771

Abstract

La and Yb were incorporated as co-doping elements into Zr-doped ceria to investigate the influence of doping ions by means of ionic radius and valence on the ceria crystal lattice and potentially on thermodynamic and kinetic properties relevant to solar-driven two-step thermochemical CO2 splitting. Both ZreLa and ZreYb co-doped ceria clearly exhibited better reduction capability than ceria and partial molar enthalpy and entropy that were in between those of Zr-doped ceria and undoped ceria. In the case of CO2 splitting kinetics, Zr-doped ceria was the slowest in accordance with relevant literature, but Ladoped samples were much faster than Yb-doped counterparts suggesting that extrinsic oxygen vacancy formation, even though important, does not primarily determine the CO2 splitting kinetics unlike the hypothesis postulated by previous works. This work elucidates the role of dopant's ionic radius, lattice constant and valence on thermodynamics and CO2 splitting kinetics via experimental demonstration, and provides a new doping strategy not based on the extrinsic oxygen vacancy formation but based on the dopant ionic radius and valence with an insight for the further doped ceria-based redox material discovery.

Item URL in elib:https://elib.dlr.de/195383/
Document Type:Article
Additional Information:Deutsche Forschungsgemeinschaft (Grant No. SCHM 1367/5-1)
Title:Strategic co-doping of ceria for improved oxidation kinetics in solar thermochemical fuel production
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Lee, KangjaeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knoblauch, NicoleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Agrafiotis, ChristosUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pein, MathiasUNSPECIFIEDhttps://orcid.org/0000-0002-2796-1229UNSPECIFIED
Roeb, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmücker, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sattler, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-4314-1124UNSPECIFIED
Date:28 April 2023
Journal or Publication Title:Materials Today Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:35
DOI:10.1016/j.mtener.2023.101321
Page Range:pp. 1-11
Publisher:Elsevier
ISSN:2468-6069
Status:Published
Keywords:Doped ceria Thermochemical cycles CO2 splitting Syngas production Redox
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Future Fuels
Institute of Materials Research
Deposited By: Clintgens, Stefanie
Deposited On:05 Jun 2023 10:38
Last Modified:13 Jun 2023 13:07

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