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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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthors 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 SCOPUS:No
In ISI Web of Science:No
Volume:4
DOI :10.4236/ajac.2013.410A1005
Page Range:pp. 37-45
Publisher:Scientific Research Publishing
ISSN:2156-8251
Status:Published
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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