Controllable synthesis, characterization, and CO oxidation activity of CeO₂ nanostructures with various morphologies

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• 作者：Haiyan He ; Ping Yang ; ^{mse_yangp@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jia Li ; Ruixia Shi ; Ling Chen ; Aiyu Zhang ; Yuanna Zhu
• 关键词：A. Grain growth ; D. CeO2 ; Chemical preparation ; CO oxidation
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：7810-7818
• 全文大小：2748 K

文摘

CeO₂ nanostructures with various morphologies were prepared through controlling preparation conditions via a hydrothermal method without any surfactants and templates. Cerium acetate, cerium chloride and cerium nitrate were used as cerium precursors to investigate the influence of anions on the growth process of CeO₂ nanostructures. The morphology evolution of CeO₂ and Ce(OH)₃ nanostructures indicates that the anions play an important role for the growth kinetics of resulting samples. Cl⁻ and Ac⁻ ions promoted the formation of one dementional (1D) CeO₂ nanostructures such as nanowires, nanorods and nano hexagonal prisms, while the oxidizing anion class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216002662&_mathId=si0001.gif&_user=111111111&_pii=S0272884216002662&_rdoc=1&_issn=02728842&md5=473fca433fa40a9bd2ec49d362341ae9">class="imgLazyJSB inlineImage" height="12" width="18" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0272884216002662-si0001.gif">class="mathContainer hidden">class="mathCode">${\mathrm{NO}}_3^{-}$ facilitated the synthesis of CeO₂ nanocubes. The hydrothermal reaction temperature is another key to govern the morphologies of CeO₂ nanostructures. The formation process of the nanostructures was explored and the possible growth mechanism was discussed. The variety of CeO₂ nanostructures represented inequable catalytic performance for CO oxidation. Because of different surface areas and structures, CeO₂ nanowires revealed the best catalysis performance while that of the nanocubes is the worst.