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Citation: YE Qing, WANG Rui-pu, XU Bo-qing. Structure and Oxygen Mobility of Ce_1-xZr_xO₂ Prepared by Citric Acid Sol-gel Method[J]. Acta Physico-Chimica Sinica, ;2006, 22(01): 33-37. doi: 10.3866/PKU.WHXB20060107 shu

Structure and Oxygen Mobility of Ce_1-xZr_xO₂ Prepared by Citric Acid Sol-gel Method

1.
Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China

Received Date: 15 June 2005
Available Online: 15 January 2006

The structure and oxygen mobility of Ce_1-xZr_xO₂ (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 Ce_1-xZr_xO₂ 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, Ce_1-xZr_xO₂ existed in a mixed phases of tetra nal and cubic Ce-Zr-O solid solutions; the percentage of tetra nal 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 Ce_0.85Zr_0.152O₂ sample is the highest.
- Ce_1-xZr_xO₂ ;Sol-gel method;Oxygen mobility;Oxygen vacancy;CeO₂-based solid solution
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Structure and Oxygen Mobility of Ce1-xZrxO2 Prepared by Citric Acid Sol-gel Method

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通讯作者: 陈斌, bchen63@163.com

Structure and Oxygen Mobility of Ce_1-xZr_xO₂ Prepared by Citric Acid Sol-gel Method