通过稀土掺杂提高多孔CeO的储氧能力。
Enhanced Oxygen Storage Capacity of Porous CeO by Rare Earth Doping.
作者信息
Xu Yaohui, Gao Liangjuan, Hou Quanhui, Wu Pingkeng, Zhou Yunxuan, Ding Zhao
机构信息
Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614000, China.
Leshan West Silicon Materials Photovoltaic and New Energy Industry Technology Research Institute, Leshan 614000, China.
出版信息
Molecules. 2023 Aug 10;28(16):6005. doi: 10.3390/molecules28166005.
CeO is an important rare earth (RE) oxide and has served as a typical oxygen storage material in practical applications. In the present study, the oxygen storage capacity (OSC) of CeO was enhanced by doping with other rare earth ions (RE, RE = Yb, Y, Sm and La). A series of Undoped and RE-doped CeO with different doping levels were synthesized using a solvothermal method following a subsequent calcination process, in which just Ce(NO)∙6HO, RE(NO)∙nHO, ethylene glycol and water were used as raw materials. Surprisingly, the Undoped CeO was proved to be a porous material with a multilayered special morphology without any additional templates in this work. The lattice parameters of CeO were refined by the least-squares method with highly pure NaCl as the internal standard for peak position calibrations, and the solubility limits of RE ions into CeO were determined; the amounts of reducible-reoxidizable Ce ions were estimated by fitting the Ce 3d core-levels XPS spectra; the non-stoichiometric oxygen vacancy () defects of CeO were analyzed qualitatively and quantitatively by O 1s XPS fitting and Raman scattering; and the OSC was quantified by the amount of H consumption per gram of CeO based on hydrogen temperature programmed reduction (H-TPR) measurements. The maximum [OSC] of CeO appeared at 5 mol.% Yb-, 4 mol.% Y-, 4 mol.% Sm- and 7 mol.% La-doping with the values of 0.444, 0.387, 0.352 and 0.380 mmol H/g by an increase of 93.04, 68.26, 53.04 and 65.22%. Moreover, the dominant factor for promoting the OSC of RE-doped CeO was analyzed.
CeO是一种重要的稀土（RE）氧化物，在实际应用中作为典型的储氧材料。在本研究中，通过掺杂其他稀土离子（RE，RE = Yb、Y、Sm和La）提高了CeO的储氧能力（OSC）。采用溶剂热法并随后进行煅烧工艺，合成了一系列不同掺杂水平的未掺杂和RE掺杂的CeO，其中仅使用Ce(NO)∙6HO、RE(NO)∙nHO、乙二醇和水作为原料。令人惊讶的是，在本工作中，未掺杂的CeO被证明是一种具有多层特殊形态的多孔材料，无需任何额外的模板。以高纯NaCl作为峰位校准的内标，通过最小二乘法对CeO的晶格参数进行了精修，并确定了RE离子在CeO中的溶解度极限；通过拟合Ce 3d芯能级XPS光谱估计了可还原-再氧化Ce离子的量；通过O 1s XPS拟合和拉曼散射对CeO的非化学计量氧空位（）缺陷进行了定性和定量分析；并基于氢程序升温还原（H-TPR）测量，通过每克CeO消耗的H量对OSC进行了量化。CeO的最大[OSC]出现在5 mol.% Yb-、4 mol.% Y-、4 mol.% Sm-和7 mol.% La-掺杂时，其值分别为0.444、0.387、0.352和0.380 mmol H/g，分别增加了93.04%、68.26%、53.04%和65.22%。此外，还分析了促进RE掺杂CeO的OSC的主要因素。
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