Fabrication of ceria particles using glycine nitrate spray pyrolysis
Fabrication of ceria particles using glycine nitrate spray pyrolysis
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DOI：
10.1016/j.surfcoat.2014.04.016
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发表时间：
2014-11-25
影响因子：
5.4
通讯作者：
Kuo, Wei-Lun
中科院分区：
文献类型：
--
作者：
Shih, Shao-Ju;Tzeng, Wei-Lung;Kuo, Wei-Lun
CeO_2基材料因其优异的性能而被广泛应用于固体氧化物燃料电池电解液、催化剂载体和一氧化碳还原催化剂等工业领域。CeO_2颗粒的形态与其性质有很好的相关性。在这里，我们表明，在甘氨酸硝酸盐喷雾热解的新方法中，使用硝酸铈、硝酸铵和甘氨酸(GN)的混合前驱体溶液可以获得不同形貌的CeO_2颗粒。研究了GN浓度分别为0、50、60、67和75mol%的五种前驱体溶液。扫描电子显微镜、透射电子显微镜和氮气吸附-脱附等温线显示出球形、中空、片状和多孔片四种不同的形貌。我们的结果表明，前驱体的溶解度、溶剂挥发速率和前驱体的热性质对其形态形成机理有很大影响。此外，我们还证明了通过选择合适的GN浓度范围(50-67摩尔%)可以获得中空颗粒的壁厚。(C)2014爱思唯尔B.V.保留所有权利。
Ceria-based materials are widely used in many industrial applications such as solid-oxide-fuel-cell electrolytes, catalyst supports and carbon monoxide reduction catalysts because of their superior properties. Morphologies of ceria particles have been well-correlated with their properties. Here we show that various morphologies of ceria particles can be achieved by using the mixed precursor solutions of cerium ammonium nitrate and glycine nitrate (GN) for the new method of glycine nitrate spray pyrolysis. Five precursor solutions with the GN concentrations of 0, 50, 60,67 and 75 mol% have been investigated. The resultant particles show four distinct morphologies of sphere, hollow, flake and porous flake using scanning electron microscopy, transmission electron microscopy and nitrogen adsorption and desorption isotherms. Our results suggest that the morphological formation mechanisms are highly influenced by the factors of precursor solubilities, solvent evaporation rates and precursor thermal properties. In addition, we have demonstrated that the wall thickness of hollow particles can be achieved by selecting the suitable GN concentration range (50-67 mol%). (c) 2014 Elsevier B.V. All rights reserved.