Hostname: page-component-7c8c6479df-5xszh Total loading time: 0 Render date: 2024-03-19T09:53:26.385Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  31 January 2011

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
Get access

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
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Minh, N.Q., J. Am. Ceram. Soc. 76, 563–588 (1993).CrossRefGoogle Scholar
2.Jiang, S.P., Callus, P.J., and Badwal, S.P.S., Solid State Ionics 132, 1 (2000).Google Scholar
3.Dees, D.W., Claar, T.D., Easler, T.E., Fee, D.C., and Mrazek, F.C., J. Electrochem. Soc. 134, 2141 (1987).CrossRefGoogle Scholar
4.Nakagawa, N., Nakjima, K., Sato, M., and Kato, K., J. Electrochem. Soc. 146, 1290 (1999).Google Scholar
5.Uchida, H., Suzuki, H., and Watanabe, M., J. Electrochem. Soc. 145, 615 (1998).Google Scholar
6.Eguchi, K., J. Alloys Compd. 250, 486 (1997).Google Scholar
7.Livermore, S.J.A., Cotton, J.W., and Ormerod, R.M., J. Power Sources 86, 411 (2000).CrossRefGoogle Scholar
8.Zhang, X., Ohara, S., Maric, R., Mukai, K., Fukui, T., Yoshida, H., Nishimura, M., Inagaki, T., and Miura, K., J. Power Sources 83, 170 (1999).CrossRefGoogle Scholar
9.Ohara, S., Maric, R., Zhang, X., Mukai, K., Fukui, T., Yoshida, H., Inagaki, T., and Miura, K., J. Power Sources 86, 455 (2000).CrossRefGoogle Scholar
10.Setoguchi, T., Okamoto, K., Eguchi, K., and Arai, H., J. Electrochem. Soc. 139, 2875 (1992).CrossRefGoogle Scholar
11.Watanabe, M., Uchida, H., Shibata, M., Mochizuki, N., and Amikura, K., J. Electrochem. Soc. 141, 342 (1994).Google Scholar
12.Higashi, K., Sonoda, K., Ono, H., Sameshima, S., and Hirata, Y., Key Eng. Mater. 159–160, 25 (1999).Google Scholar
13.Higashi, K., Sonoda, K., Ono, H., Sameshima, S., and Hirata, Y., J. Mater. Res. 14, 957 (1999).CrossRefGoogle Scholar
14.Kofstad, P., Mater. Sci. Res. 9, 383 (1974).Google Scholar
15.Ando, K. and Oishi, Y., Bull. Ceram. Soc. Jpn. 17, 412 (1982).Google Scholar
16.Saito, S., Somiya, S., and Okikawa, S., J. Ceram. Soc. Jpn. 74, 121 (1966).Google Scholar
17.Sameshima, S., Higashi, K., and Hirata, Y., J. Ceram. Proc. Res. 1, 27 (2000).Google Scholar
18.Iida, Y., J. Am. Ceram. Soc. 41, 397 (1958).Google Scholar