Reducing the chemical expansion coefficient in ceria by addition of zirconia

S. R. Bishop, D. Marrocchelli, W. Fang, K. Amezawa, K. Yashiro, G. W. Watson

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

For the first time, the role of isovalent Zr substitution in cerium oxide on the non-stoichiometry induced dilation (chemical expansion) was investigated. Chemical expansion was derived experimentally using HTXRD, dilatometry, and TGA measurements on Pr0.1Zr0.4Ce0.5O 1.95-δ and computationally with DFT calculations on Zr 0.5Ce0.5O2-δ. Though Zr was found to increase the reducibility and the corresponding chemical expansion of ceria in the studied range, the relationship between chemical expansion and non-stoichiometry (the chemical expansion coefficient) was significantly smaller (54% less) than that observed in ceria, and consistent with predictions from the authors' previous work. The origin of the reduced chemical expansion coefficient, associated with a larger contraction of the lattice around oxygen vacancies, is explained using DFT calculations and corroborated with prior investigations of enhanced reducibility of ceria-zirconia. Additionally, implications of this discovery for solid oxide fuel cells and heterogeneous catalyst systems are also discussed.

Original languageEnglish
Pages (from-to)1142-1146
Number of pages5
JournalEnergy and Environmental Science
Volume6
Issue number4
DOIs
Publication statusPublished - 2013 Apr

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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