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Article

A Novel Method for the Preparation of Fibrous CeO2–ZrO2–Y2O3 Compacts for Thermochemical Cycles

German Aerospace Center (DLR), Institute of Materials Research, 51147 Köln, Germany
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Academic Editors: Maged Bekheet and Ulla Simon
Crystals 2021, 11(8), 885; https://doi.org/10.3390/cryst11080885
Received: 29 June 2021 / Revised: 22 July 2021 / Accepted: 26 July 2021 / Published: 29 July 2021
(This article belongs to the Special Issue Advanced Functional Oxide Ceramics)
Zirconium-Yttrium-co-doped ceria (Ce0.85Zr0.13Y0.02O1.99) compacts consisting of fibers with diameters in the range of 8–10 µm have been successfully prepared by direct infiltration of commercial YSZ fibers with a cerium oxide matrix and subsequent sintering. The resulting chemically homogeneous fiber-compacts are sinter-resistant up to 1923 K and retain a high porosity of around 58 vol% and a permeability of 1.6–3.3 × 10−10 m² at a pressure gradient of 100–500 kPa. The fiber-compacts show a high potential for the application in thermochemical redox cycling due its fast redox kinetics. The first evaluation of redox kinetics shows that the relaxation time of oxidation is five times faster than that of dense samples of the same composition. The improved gas exchange due to the high porosity also allows higher reduction rates, which enable higher hydrogen yields in thermochemical water-splitting redox cycles. The presented cost-effective fiber-compact preparation method is considered very promising for manufacturing large-scale functional components for solar-thermal high-temperature reactors. View Full-Text
Keywords: Zirconium-Yttrium-co-doped ceria; fiber-compact; thermochemical redox cycling Zirconium-Yttrium-co-doped ceria; fiber-compact; thermochemical redox cycling
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MDPI and ACS Style

Knoblauch, N.; Mechnich, P. A Novel Method for the Preparation of Fibrous CeO2–ZrO2–Y2O3 Compacts for Thermochemical Cycles. Crystals 2021, 11, 885. https://doi.org/10.3390/cryst11080885

AMA Style

Knoblauch N, Mechnich P. A Novel Method for the Preparation of Fibrous CeO2–ZrO2–Y2O3 Compacts for Thermochemical Cycles. Crystals. 2021; 11(8):885. https://doi.org/10.3390/cryst11080885

Chicago/Turabian Style

Knoblauch, Nicole, and Peter Mechnich. 2021. "A Novel Method for the Preparation of Fibrous CeO2–ZrO2–Y2O3 Compacts for Thermochemical Cycles" Crystals 11, no. 8: 885. https://doi.org/10.3390/cryst11080885

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