D'Angelo Anita M, Chaffee Alan L
School of Chemistry, Monash University, 17 Rainforest Walk, Victoria 3800, Australia.
ACS Omega. 2017 Jun 7;2(6):2544-2551. doi: 10.1021/acsomega.7b00550. eCollection 2017 Jun 30.
The oxygen uptake of a series of Pr-CeO materials was measured using thermogravimetric analysis at 420 and 600 °C, and at both temperatures, 20% Pr-CeO was found to have the highest uptake. The materials were characterized using X-ray diffraction and scanning transmission electron microscopy. Defects in the materials were identified using Raman spectroscopy, and ultraviolet-visible spectroscopy was used to show the presence of Pr cations in the +3 oxidation state. The existence of these species was attributed to be responsible for the ability of the materials to uptake oxygen. Electron energy loss spectroscopy was used to investigate the effect of Pr addition to CeO; the Ce M/M and O / ratios were calculated to indicate the relative changes in the Ce and oxygen vacancy concentration, respectively. There was no observable increase in the Ce concentration; however, the oxygen vacancy concentration increased with an increase in the Pr content. Thus, Pr increases the defect concentration and the ability of the materials to uptake oxygen.
使用热重分析在420℃和600℃下测量了一系列Pr-CeO材料的氧摄取量，在这两个温度下，均发现20%的Pr-CeO具有最高的摄取量。使用X射线衍射和扫描透射电子显微镜对材料进行了表征。使用拉曼光谱识别材料中的缺陷，并用紫外可见光谱显示+3氧化态Pr阳离子的存在。这些物种的存在被认为是材料摄取氧能力的原因。使用电子能量损失光谱研究了Pr添加到CeO中的影响；计算了Ce M/M和O / 比率，分别表明Ce和氧空位浓度的相对变化。Ce浓度没有明显增加；然而，氧空位浓度随着Pr含量的增加而增加。因此，Pr增加了缺陷浓度和材料摄取氧的能力。
