Effect of sodium nitrate on microwave-assisted synthesis of ceria nanocubes
Effect of sodium nitrate on microwave-assisted synthesis of ceria nanocubes
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DOI：
10.1016/j.matlet.2016.04.186
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发表时间：
2016-09
影响因子：
3
通讯作者：
Tamra J. Fisher;Meiyu Wang;Y. Ibrahim;Benjamin Steffensmeier;C. L. Cheung
中科院分区：
文献类型：
--
作者：
Tamra J. Fisher;Meiyu Wang;Y. Ibrahim;Benjamin Steffensmeier;C. L. Cheung
萤石结构的氧化铈（ceria; CeO2−x, 0≤x<0.5）具有促进氧化还原反应的独特催化活性。在最常见的氧化铈切面中，氧化铈纳米立方的{100}切面被发现比氧化铈纳米多面体的{111}切面具有更强的催化活性和更好的贵金属支撑。本文报道了一种使用硝酸钠作为表面改性剂（SMA）的微波辅助合成二氧化铈纳米立方的方法。微波法直接缩放了传统的水热参数，得到了铈纳米立方和铈纳米棒的混合物。在合成过程中，通过硝酸钠与硝酸铈前驱体的不同摩尔比，考察了硝酸钠对纳米二氧化铈控形生长的影响。从我们对生成的二氧化铈产物的形态学分析中，我们假设SMA的机制作用是破坏二氧化铈纳米晶体{110}和{111}面的生长，并影响前驱体在二氧化铈晶体表面的掺入率。
Fluorite-structured cerium oxide (ceria; CeO2−x, 0≤x<0.5) possesses unique catalytic activity to promote redox reactions. Among the most common facets of ceria, the {100} facets of ceria nanocubes have been found to be more catalytically active as well as better noble metal supports than the {111} facets of ceria nanopolyhedra. Here we report a facile microwave-assisted synthesis of ceria nanocubes using sodium nitrate as the surface modifying agent (SMA). Microwave methods directly scaled from conventional hydrothermal parameters were found to produce mixtures of ceria nanocubes and ceria nanorods. The effect of sodium nitrate on the shape-control growth of ceria nanocubes was investigated by using various mole ratios of sodium nitrate to the cerium nitrate precursor in the synthetic study. From our morphological analysis of resulting ceria products, the mechanistic roles of the SMA were postulated to destabilize the growth of {110} and {111} facets of ceria nanocrystals as well as influencing the incorporation rate of precursors on the surfaces of ceria crystals.