Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure
Doping CeO<sub>2</sub> with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO<sub>2</sub>), doping only during the impregnation process (I-Y-doped CeO<sub>2</sub>), and doping during both the hy...
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MDPI AG
2022-12-01
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| author | Yaohui Xu Liangjuan Gao Zhao Ding |
| author_facet | Yaohui Xu Liangjuan Gao Zhao Ding |
| author_sort | Yaohui Xu |
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| description | Doping CeO<sub>2</sub> with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO<sub>2</sub>), doping only during the impregnation process (I-Y-doped CeO<sub>2</sub>), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO<sub>2</sub>). During the three synthesis strategies of Y-doped CeO<sub>2</sub>, these Y ions could be incorporated into the CeO<sub>2</sub> lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO<sub>2</sub> crystal itself contained a certain number of intrinsic <i>V</i><sub>O</sub> defects, and Y-doping was beneficial for the creation of extrinsic <i>V</i><sub>O</sub> defects. The relative concentrations of <i>V</i><sub>O</sub> defects were quantified by the values of <i>A</i><sub>592</sub>/<i>A</i><sub>464</sub> obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO<sub>2</sub>, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO<sub>2</sub> were enhanced, and the sequence of OSCs was: H-Y-doped CeO<sub>2</sub> (0.372 mmol/g) > H/I-Y-doped CeO<sub>2</sub> (0.353 mmol/g) > I-Y-doped CeO<sub>2</sub> (0.248 mmol/g) > Undoped CeO<sub>2</sub> (0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results. |
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| spelling | doaj.art-f55d8093b1084179b73eb6faaca3bc222023-11-24T16:24:48ZengMDPI AGMaterials1996-19442022-12-011524897110.3390/ma15248971Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite StructureYaohui Xu0Liangjuan Gao1Zhao Ding2Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614004, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610065, ChinaNational Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaDoping CeO<sub>2</sub> with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO<sub>2</sub>), doping only during the impregnation process (I-Y-doped CeO<sub>2</sub>), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO<sub>2</sub>). During the three synthesis strategies of Y-doped CeO<sub>2</sub>, these Y ions could be incorporated into the CeO<sub>2</sub> lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO<sub>2</sub> crystal itself contained a certain number of intrinsic <i>V</i><sub>O</sub> defects, and Y-doping was beneficial for the creation of extrinsic <i>V</i><sub>O</sub> defects. The relative concentrations of <i>V</i><sub>O</sub> defects were quantified by the values of <i>A</i><sub>592</sub>/<i>A</i><sub>464</sub> obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO<sub>2</sub>, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO<sub>2</sub> were enhanced, and the sequence of OSCs was: H-Y-doped CeO<sub>2</sub> (0.372 mmol/g) > H/I-Y-doped CeO<sub>2</sub> (0.353 mmol/g) > I-Y-doped CeO<sub>2</sub> (0.248 mmol/g) > Undoped CeO<sub>2</sub> (0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results.https://www.mdpi.com/1996-1944/15/24/8971CeO<sub>2</sub>rare-earthdopinghydrothermalimpregnationoxygen storage capability |
| spellingShingle | Yaohui Xu Liangjuan Gao Zhao Ding Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure Materials CeO<sub>2</sub> rare-earth doping hydrothermal impregnation oxygen storage capability |
| title | Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure |
| title_full | Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure |
| title_fullStr | Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure |
| title_full_unstemmed | Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure |
| title_short | Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO<sub>2</sub> with a Cubic Fluorite Structure |
| title_sort | synthesis and oxygen storage capacities of yttrium doped ceo sub 2 sub with a cubic fluorite structure |
| topic | CeO<sub>2</sub> rare-earth doping hydrothermal impregnation oxygen storage capability |
| url | https://www.mdpi.com/1996-1944/15/24/8971 |
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