Controlled coprecipitation of amorphous cerium-based carbonates with suitable morphology as precursors of ceramic electrolytes for IT-SOFCs

Title
Controlled coprecipitation of amorphous cerium-based carbonates with suitable morphology as precursors of ceramic electrolytes for IT-SOFCs
Authors
윤성필그라지아 아카르도Gianfranco Dell’AgliMaria Cristina MascoloLuca Spiridigliozzi
Keywords
amorphous coprecipitate; ammonium carbonate; doped ceria; hydroxycarbonates; Sintering
Issue Date
2019-03
Publisher
Materials
Citation
VOL 12, NO 5-702-16
Abstract
To be suitable as electrolytes in intermediate temperature solid oxide fuel cell (IT-SOFC), ceramic precursors have to be characterized by high sintering aptitude for producing fully densified products which are needed for this kind of application. Therefore, synthesis processes able to prepare highly reactive powders with low costs are noteworthy to be highlighted. It has been shown that amorphous coprecipitates based on cerium doped (and codoped) hydrated hydroxycarbonates can lead to synthesized ceramics with such desired characteristics. These materials can be prepared by adopting a simple coprecipitation technique using ammonium carbonate as precipitating agent. As a function of both the molar ratio between carbonate anions and total metallic cations, and the adopted mixing speed, the coprecipitate can be either amorphous, owning a very good morphology, or crystalline, owning worse morphology, packing aptitude, and sinterability. The amorphous powders, upon a mild calcination step, gave rise to the formation of stable solid solutions of fluorite-structured ceria maintaining the same morphology of the starting powders. Such calcined powders are excellent precursors for sintering ceramic electrolytes at low temperatures and with very high electrical conductivity in the intermediate temperature range (i.e., 500– 700 C). Therefore, irrespective of the actual composition of ceria-based systems, by providing an accurate control of both chemical conditions and physical parameters, the coprecipitation in the presence of ammonium carbonate can be considered as one of the most promising synthesis route in terms of cost/effectiveness to prepare excellent ceramic precursors for the next generation of IT-SOFC solid electrolytes.
URI
http://pubs.kist.re.kr/handle/201004/69330
ISSN
1996-1944
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE