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

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 fib...

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Bibliographic Details
Published in:Crystals (Basel) 2021-08, Vol.11 (8), p.885
Main Authors: Knoblauch, Nicole, Mechnich, Peter
Format: Article
Language:English
Subjects:
Cerium oxides
Compacts
fiber-compact
Gas exchange
High temperature
Kinetics
Microscopy
Microstructure
Morphology
Oxidation
Permeability
Porosity
Relaxation time
Sintering
Sintering (powder metallurgy)
thermochemical redox cycling
Water splitting
Yttria-stabilized zirconia
Yttrium
Yttrium oxide
Zirconium dioxide
Zirconium-Yttrium-co-doped ceria
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Summary: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.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11080885