Facile and Mild Strategy to Construct Mesoporous CeO2鈥揅uO Nanorods with Enhanced Catalytic Activity toward CO Oxidation

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• 作者：Guozhu Chen ; Qihui Xu ; Ying Yang ; Cuncheng Li ; Taizhong Huang ; Guoxin Sun ; Shuxiang Zhang ; Dongling Ma ; Xu Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：7
• 期：42
• 页码：23538-23544
• 全文大小：595K
• ISSN：1944-8252

文摘

CeO₂鈥揅uO nanorods with mesoporous structure were synthesized by a facile and mild strategy, which involves an interfacial reaction between Ce₂(SO₄)₃ precursor and NaOH ethanol solution at room temperature to obtain mesoporous CeO₂ nanorods, followed by a solvothermal treatment of as-prepared CeO₂ and Cu(CH₃COO)₂. Upon solvothermal treatment, CuO species is highly dispersed onto the CeO₂ nanorod surface to form CeO₂鈥揅uO composites, which still maintain the mesoporous feature. A preliminary CO catalytic oxidation study demonstrated that the CeO₂鈥揅uO samples exhibited strikingly high catalytic activity, and a high CO conversion rate was observed without obvious loss in activity even after thermal treatment at a high temperature of 500 掳C. Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and hydrogen temperature-programmed reduction (H₂-TPR) analysis revealed that there is a strong interaction between CeO₂ and CuO. Moreover, it was found that the introduction of CuO species into CeO₂ generates oxygen vacancies, which is highly likely to be responsible for high catalytic activity toward CO oxidation of the mesoporous CeO₂鈥揅uO nanorods.