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Thermal stability of nanometer-sized NiO and Sm-doped ceria powders

Published online by Cambridge University Press:  31 January 2011

Yoshihiro Okawa ,
Toshitatsu Matsumoto ,
Toshiya Doi  and
Yoshihiro Hirata
Yoshihiro Okawa
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Toshitatsu Matsumoto
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Toshiya Doi
Affiliation:
Department of Electrical and Electronics Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Yoshihiro Hirata
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
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Abstract

A fine NiO powder and a Sm-doped ceria powder with a composition of Ce0.8Sm0.2O1.9 were synthesized by heating the oxalate precursors at 300–1200 °C in air to produce a cermet (anode material) for solid oxide fuel cell. A 0.2 M Ni(NO3)2 solution and a 0.2 M Ce(NO3)3–Sm(NO3)3 solution were mixed with 0.4 M oxalate solution, respectively, to produce the oxalate precursors. Only the cubic phase of Ce0.8Sm0.2O1.9 was formed in the calcined powders from the Sm-doped cerium oxalate. However, the mixed phases of NiO and Ni were produced in the NiO precursor after the calcination at 300–600 °C. At higher temperatures, only NiO was detected. The primary particle sizes, which were determined from the Brunauer-Emmett-Teller analysis surface areas, were 60 nm for NiO and 10 nm for Ru/Sm-doped ceria (SDC) after the heat treatment at 400 °C. The oxalate precursors of SDC and NiO provided 433 and 259 kJ/mol of the activation energy, respectively, for sintering/grain growth in the temperature range from 600 to 1200 °C. As-produced SDC precursor formed platelike secondary particles of 0.5–2-μm length by the heating at 800 °C. Heating of Ni oxalate at 800 °C produced isotropic fine NiO secondary particles of 0.5–2-μm sizes.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 9 , September 2002 , pp. 2266 - 2274
Copyright
Copyright © Materials Research Society 2002

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