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Thermogravimetric Analysis of Zirconia-Doped Ceria for Thermochemical Production of Solar Fuel

Call, Friedemann and Roeb, Martin and Schmücker, Martin and Bru, Hélène and Curulla-Ferre, Daniel and Sattler, Christian and Pitz-Paal, Robert (2013) Thermogravimetric Analysis of Zirconia-Doped Ceria for Thermochemical Production of Solar Fuel. American Journal of Analytical Chemistry (AJAC), 4 (10A), pp. 37-45. Scientific Research Publishing. doi: 10.4236/ajac.2013.410A1005. ISSN 2156-8251.

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Official URL: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=37313


Developing an efficient redox material is crucial for thermochemical cycles that produce solar fuels (e.g. H2 and CO), enabling a sustainable energy supply. In this study, zirconia-doped cerium oxide (Ce1−xZrxO2) was tested in CO2-split- ting cycles for the production of CO. The impact of the Zr-content on the splitting performance was investigated within the range 0 ≤ x < 0.4. The materials were synthesized via a citrate nitrate auto combustion route and subjected to ther- mogravimetric experiments. The results indicate that there is an optimal zirconium content, x = 0.15, improving the specific CO2-splitting performance by 50% compared to pure ceria. Significantly enhanced performance is observed for 0.15 ≤ x ≤ 0.225. Outside this range, the performance decreases to values of pure ceria. These results agree with theo- retical studies attributing the improvements to lattice modification. Introducing Zr4+ into the fluorite structure of ceria compensates for the expansion of the crystal lattice caused by the reduction of Ce4+ to Ce3+. Regarding the reaction conditions, the most efficient composition Ce0.85Zr0.15O2 enhances the required conditions by a temperature of 60 K or one order of magnitude of the partial pressure of oxygen p(O2) compared to pure ceria. The optimal composition was tested in long-term experiments of one hundred cycles, which revealed declining splitting kinetics.

Item URL in elib:https://elib.dlr.de/84536/
Document Type:Article
Title:Thermogravimetric Analysis of Zirconia-Doped Ceria for Thermochemical Production of Solar Fuel
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Call, Friedemannfriedemann.call (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Bru, HélèneTotal S.A.UNSPECIFIED
Curulla-Ferre, DanielTotal S.A.UNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:October 2013
Journal or Publication Title:American Journal of Analytical Chemistry (AJAC)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:No
DOI :10.4236/ajac.2013.410A1005
Page Range:pp. 37-45
Publisher:Scientific Research Publishing
Keywords:Water Splitting; CO2 Splitting; Thermochemical Cycle; Ceria; CO; Solar Fuels; Hydrogen; H2; Zirconia; Synthesis Gas
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Institute of Materials Research > Keramische Strukturwerkstoffe
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:17 Oct 2013 14:10
Last Modified:17 Oct 2013 14:10

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