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Peng Y, Si XL, Shang C, Liu ZP. Abundance of Low-Energy Oxygen Vacancy Pairs Dictates the Catalytic Performance of Cerium-Stabilized Zirconia. J Am Chem Soc 2024; 146:10822-10832. [PMID: 38591182 DOI: 10.1021/jacs.4c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Cerium-stabilized zirconia (Ce1-xZrxOy, CZO) is renowned for its superior oxygen storage capacity (OSC), a key property long believed to be beneficial to catalytic oxidation reactions. However, 50% Ce-containing CZO recorded with the highest OSC has disappointingly poor performance in catalytic oxidation reactions compared to those with higher Ce contents but lower OSC ability. Here, we employ global neural network (G-NN)-based potential energy surface exploration methods to establish the first ternary phase diagram for bulk structures of CZO, which identifies three critical compositions of CZO, namely, 50, 60, and 80% Ce-containing CZO that are thermodynamically stable under typical synthetic conditions. 50% Ce-containing CZO, although having the highest OSC, exhibits the lowest O vacancy (Ov) diffusion rate. By contrast, 60% Ce-containing CZO, despite lower OSC (33.3% OSC compared to that of 50% Ce-containing CZO), reaches the highest Ov diffusion ability and thus offers the highest CO oxidation catalytic performance. The physical origin of the high performance of 60% Ce-containing CZO is the abundance of energetically favorable Ov pairs along the ⟨110⟩ direction, which reduces the energy barrier of Ov diffusion in the bulk and promotes O2 activation on the surface. Our results clarify the long-standing puzzles on CZO and point out that 60% Ce-containing CZO is the most desirable composition for typical CZO applications.
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Affiliation(s)
- Yao Peng
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Xia-Lan Si
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Cheng Shang
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University, Shanghai 200433, China
- Shanghai Qi Zhi Institution, Shanghai 200030, China
| | - Zhi-Pan Liu
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University, Shanghai 200433, China
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
- Shanghai Qi Zhi Institution, Shanghai 200030, China
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van Gent J, Roig A. Ce 1-xZr xO 2 nanoparticles in bacterial cellulose, bio-based composites with self-regenerating antioxidant capabilities. NANOSCALE 2023; 15:13018-13024. [PMID: 37485916 DOI: 10.1039/d3nr02872k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Bacterial cellulose (BC) is an emerging biopolymer with ever-widening uses in the biomedical field due to its purity, mechanical stability, conformability, moisture control, and biocompatibility. In the wet form, its highly porous nanofibrillar structure and abundant surface hydroxyl groups enable the functionalisation of BC with inorganic nanoparticles (NPs), granting the material additional purposive capabilities. As oxidative stress caused by reactive oxygen species (ROS) negatively affects various cellular structures, the functionalisation of BC with CeO2 NPs, known antioxidants, is pursued in this work to achieve composites capable of minimising inflammation and tissue damage. We report on low-temperature in situ syntheses of CeO2 NPs in BC enabling the formation of BC-CeO2 composites that exhibit self-regenerating antioxidant properties, as verified by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays and studies of the evolution in the CeO2 absorption edge (indicative of the Ce3+ and Ce4+ fractions). X-Ray photoelectron spectroscopy (XPS) further reveals that incorporation of zirconium into the CeO2 lattice leads to a four-fold increase in the Ce3+: Ce4+ ratio, thereby enhancing the composite antioxidant performance as exemplified by BC-Ce0.6Zr0.4O2 recording the highest %DPPH scavenging per unit mass of NPs among the BC-Ce1-xZrxO2 studied systems.
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Affiliation(s)
- Johanna van Gent
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Spain.
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands.
| | - Anna Roig
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Spain.
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Yin X, Li S, Deng J, Wang Y, Li M, Zhao Y, Wang W, Wang J, Chen Y. Superior Pd–Rh Three-Way Catalyst: Modulating the Surface Composition by Introducing Ceria-Zirconia with Partial κ-Ce 2Zr 2O 8 Structure as Support. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xinyi Yin
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
| | - Shanshan Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
| | - Jie Deng
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, Sichuan China
| | - Yun Wang
- Sinocat Environmental Technology Co., ltd, Chengdu, 611730, Sichuan China
| | - Mengchen Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
| | - Yi Zhao
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
| | - Wei Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
| | - Jianli Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
- Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu, 610064, Sichuan China
- Center of Engineering of Environmental Catalytic Material, Chengdu, 610064, Sichuan China
| | - Yaoqiang Chen
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan China
- Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu, 610064, Sichuan China
- Center of Engineering of Environmental Catalytic Material, Chengdu, 610064, Sichuan China
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Sun J, Yamaguchi D, Tang L, Periasamy S, Ma H, Hart JN, Chiang K. Enhancement of oxygen exchanging capability by loading a small amount of ruthenium over ceria-zirconia on dry reforming of methane. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.103407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Deng J, Li S, Yin X, Li M, Wang J, Chen Y, Chen Y. Influence of surface Ce/Zr ratio on formation of κ-Ce2Zr2O8 superstructure and its application in three-way catalysis. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Matsukawa T, Honda T, Ohshita H, Otomo T, Ishigaki T. Average and local structures of κ-phase CeZrO 4 crystals by neutron powder diffraction. CrystEngComm 2019. [DOI: 10.1039/c9ce01226e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The average and local structures of κ-phase CeZrO4 (κ-CZ) were evaluated by neutron powder diffraction measurements.
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Affiliation(s)
- Takeshi Matsukawa
- Frontier Research Center for Applied Atomic Sciences
- Ibaraki University
- Tokai
- Japan
| | - Takashi Honda
- Institute of Materials Structure Science
- High Energy Accelerator Research Organization
- Tsukuba
- Japan
| | - Hidetoshi Ohshita
- Institute of Materials Structure Science
- High Energy Accelerator Research Organization
- Tsukuba
- Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science
- High Energy Accelerator Research Organization
- Tsukuba
- Japan
- Graduate School of Science and Engineering
| | - Toru Ishigaki
- Frontier Research Center for Applied Atomic Sciences
- Ibaraki University
- Tokai
- Japan
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