Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (01): 33-37.doi: 10.3866/PKU.WHXB20060107

• ARTICLE • Previous Articles     Next Articles

Structure and Oxygen Mobility of Ce1-xZrxO2 Prepared by Citric Acid Sol-gel Method

YE Qing; WANG Rui-pu; XU Bo-qing   

  1. Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
  • Received:2005-06-15 Revised:2005-07-12 Published:2006-01-15
  • Contact: Xu Bo-qing

Abstract: The structure and oxygen mobility of Ce1-xZrxO2 (0 ≤x≤ 1) samples prepared by citric acid sol-gel method were characterized by XRF, XRD, Raman, XPS, Ar+ etching-XPS and H2-TPR. The data showed that the crystalline structure of Ce1-xZrxO2 can significantly affect the oxygen mobility. When x≤0.15, the samples were found to exist as cubic Ce-Zr-O solid solutions. An increase in x resulted in a shrinking of the crystal unit volume, an increasing in the number of oxygen vacancies, and an increasing in the oxygen mobility as well. When x>0.15, Ce1-xZrxO2 existed in a mixed phases of tetragonal and cubic Ce-Zr-O solid solutions; the percentage of tetragonal phase increased, oxygen vacancies decreased and oxygen mobility reduced with increasing x in these samples. Therefore, this present work shows that oxygen mobility in the Ce0.85Zr0.152O2 sample is the highest.

Key words: Ce1-xZrxO2, Sol-gel method, Oxygen mobility, Oxygen vacancy, CeO2-based solid solution