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Fabrication of Highly Porous Yttria‐Stabilized Zirconia by Acid Leaching Nickel from a Nickel‐Yttria‐Stabilized Zirconia Cermet
Author(s) -
Kim Hyuk,
Rosa Calvin,
Boaro Marta,
Vohs John M.,
Gorte Raymond J.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00299.x
Subject(s) - materials science , yttria stabilized zirconia , cermet , nickel , non blocking i/o , cubic zirconia , calcination , porosity , leaching (pedology) , metallurgy , fabrication , nickel oxide , chemical engineering , composite material , ceramic , chemistry , catalysis , medicine , biochemistry , environmental science , alternative medicine , pathology , soil science , engineering , soil water
Porous Y 2 O 3 ‐stabilized ZrO 2 (YSZ) samples were synthesized by preparing NiO/YSZ composites by tape casting and calcining at 1800 K, reducing the NiO to nickel in H 2 at 973 K, and finally leaching the nickel out of the structure with 2.2 M HNO 3 at 353 K. Porous YSZ was prepared from NiO/YSZ composites containing 0, 20, 40, and 50 wt% NiO. Complete removal of the nickel was demonstrated by XRD, weight changes, and porosity increases. Porosities >75% could be achieved without structural collapse of the YSZ phase. Finally, the method was applied to the fabrication of a solid oxide fuel cell with a copper‐based anode operating on H 2 and n ‐butane.