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Investigation of CO2 splitting on ceria-based redox materials at 300 ≤ T ≤ 800 °C with oxygen isotope exchange experiments

Uxa, Daniel and Dörrer, Lars and Schulz, Michael and Knoblauch, Nicole and Fielitz, Peter and Roeb, Martin and Schmücker, Martin and Borchardt, Günter (2022) Investigation of CO2 splitting on ceria-based redox materials at 300 ≤ T ≤ 800 °C with oxygen isotope exchange experiments. Energies. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/pr11010109. ISSN 1996-1073.

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Surface exchange and bulk transport of oxygen are of high relevance for ceria-based redox materials, which are envisaged for future solar thermochemical splitting of carbon dioxide. Experimental investigations of oxygen isotope exchange on CeO2-δ, Ce0.9M3+0.1O1.95-δ (with M3+ = Y, Sm) and Ce0.9M4+0.1O2-δ (with M4+ = Zr) samples were carried out utilizing oxygen isotope enriched C18O2 gas atmospheres followed by Secondary Ion Mass Spectrometry (SIMS). Experimental data reveal promising results in terms of CO2 splitting when trivalent (especially Sm) doped ceria is employed. Reaction temperatures are lower than previously proposed/reported, due to the weak temperature dependency of the parameters and .The majorities of isotope exchange experiments show higher values of and for Sm-doped cerium dioxide, in comparison to Y-doped and Zr-doped ceria, as well as nominally undoped ceria. Apparant activation energies for both, K and D are lowest for Sm-doped ceria. Using Zr-doped cerium oxide shows various negative aspects. Zr-doping of ceria enhances the reducibility, but possible Zr-based surface alteration effects and dopant-induced migration barrier enhancement in Zr-doped ceria are detrimental for surface exchange and oxygen diffusion at lower temperatures of T ≤ 800 °C.

Item URL in elib:https://elib.dlr.de/189848/
Document Type:Article
Title:Investigation of CO2 splitting on ceria-based redox materials at 300 ≤ T ≤ 800 °C with oxygen isotope exchange experiments
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Uxa, Danieltechnische universität clausthal, institut für metallurgieUNSPECIFIEDUNSPECIFIED
Dörrer, LarsTechnische Universität Clausthal, Institut für MetallurgieUNSPECIFIEDUNSPECIFIED
Fielitz, PeterTechnische Universität Clausthal, Institut für Metallurgie, Clausthal-Zellerfeld, GermanyUNSPECIFIEDUNSPECIFIED
Schmücker, MartinHRW University of Applied Science, Institute of Mechanical Engineering, Mülheim an der Ruhr, GermanyUNSPECIFIEDUNSPECIFIED
Borchardt, GünterTechnische Universität Clausthal, Institut für MetallurgieUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Energies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:ceria, oxygen diffusion, oxygen surface exchange, thermochemical cycling, carbon dioxide
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 VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Chemical Energy Carriers
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Institute of Future Fuels
Deposited By: Knoblauch, Nicole
Deposited On:30 Jan 2023 17:51
Last Modified:27 Feb 2023 14:35

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