Xu Yaohui, Gao Liangjuan, Wu Pingkeng, Ding Zhao
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.
Materials (Basel). 2023 Aug 4;16(15):5478. doi: 10.3390/ma16155478.
A cubic fluorite-type CeO with mesoporous multilayered morphology was synthesized by the solvothermal method followed by calcination in air, and its oxygen storage capacity (OSC) was quantified by the amount of O consumption per gram of CeO based on hydrogen temperature programmed reduction (H-TPR) measurements. Doping CeO with ytterbium (Yb) and nitrogen (N) ions proved to be an effective route to improving its OSC in this work. The OSC of undoped CeO was 0.115 mmol O/g and reached as high as 0.222 mmol O/g upon the addition of 5 mol.% Yb(NO)∙5HO, further enhanced to 0.274 mmol O/g with the introduction of 20 mol.% triethanolamine. Both the introductions of Yb cations and N anions into the CeO lattice were conducive to the formation of more non-stoichiometric oxygen vacancy () defects and reducible-reoxidizable Ce ions. To determine the structure performance relationships, the partial least squares method was employed to construct two linear functions for the doping level vs. lattice parameter and [] vs. OSC/.
通过溶剂热法合成了具有介孔多层形态的立方萤石型CeO，随后在空气中煅烧，并基于氢程序升温还原（H-TPR）测量，通过每克CeO的O消耗量来定量其储氧能力（OSC）。在这项工作中，用镱（Yb）和氮（N）离子掺杂CeO被证明是提高其OSC的有效途径。未掺杂的CeO的OSC为0.115 mmol O/g，在添加5 mol.% Yb(NO)∙5H₂O后达到高达0.222 mmol O/g，随着引入20 mol.%三乙醇胺进一步提高到0.274 mmol O/g。Yb阳离子和N阴离子引入CeO晶格均有利于形成更多非化学计量的氧空位（）缺陷和可还原-再氧化的Ce离子。为了确定结构-性能关系，采用偏最小二乘法构建了两个线性函数，分别用于描述掺杂水平与晶格参数以及[]与OSC/的关系。
