Template-free Synthesis of Single-Crystalline-like CeO2 Hollow Nanocubes

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• 作者：Guozhu Chen ; Caixia Xu ; Xinyu Song ; Shuling Xu ; Yi Ding ; Sixiu Sun
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：December 3, 2008
• 年：2008
• 卷：8
• 期：12
• 页码：4449-4453
• 全文大小：281K
• 年卷期：v.8,no.12(December 3, 2008)
• ISSN：1528-7505

文摘

Novel single-crystalline-like CeO₂ hollow nanocubes were synthesized through a solvothermal method using peroxyacetic acid (PAA) as the oxidant in the absence of any templates. The structure and morphology of CeO₂ hollow nanocubes were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The hollow nanocubes have an average edge length of 120 nm and shell thickness of 30 nm. TEM analyses demonstrate the formation of CeO₂ hollow nanocubes is ascribed to the combination of oriented attachment and Ostwald ripening. At the beginning, a well-defined cube-like geometrical structure is formed through oriented attachment of small nanocrystallites. Then, solid evacuation in the central part via Ostwald ripening leads to single-crystalline-like hollow nanocubes. It was found that both peroxide (CH₃COOOH or H₂O₂) and solution acidity are critical factors in determining the final morphology of the products. Compared to bulky CeO₂ powders, the prepared CeO₂ hollow nanocubes exhibited a higher catalytic activity toward CO oxidation.