In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts
Heterogeneous catalysis has significant applications in energy conversion, chemical production, and environmental treatment. Among them, the supported catalyst Pt/CeO<sub>2</sub> has attracted much attention due to its high catalytic activity and stability. While the particle size of the...
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MDPI AG
2025-02-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/15/3/215 |
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| author | Yuye Li Jianyu Cao Zhongshi Zhang Jing Xia Xiangmin Meng |
| author_facet | Yuye Li Jianyu Cao Zhongshi Zhang Jing Xia Xiangmin Meng |
| author_sort | Yuye Li |
| collection | DOAJ |
| description | Heterogeneous catalysis has significant applications in energy conversion, chemical production, and environmental treatment. Among them, the supported catalyst Pt/CeO<sub>2</sub> has attracted much attention due to its high catalytic activity and stability. While the particle size of the catalyst strongly influences its performance, the dynamic behavior and the underlying mechanism of the particle size effect under realistic reactions have not been fully clarified. Using in situ transmission electron microscopy and mass spectrometry, we systematically investigated the size-dependent surface restructuring of Pt nanoparticles supported on CeO<sub>2</sub> in high-temperature redox environments. Larger Pt nanoparticles exhibited significant surface fluctuations during oxidation, which could be reconstructed under reducing conditions, with a slight rotation after the reaction cycle. In contrast, smaller Pt particles demonstrated greater stability, maintaining a constant size after the reaction while their surface structures continuously restructured into low-index crystal planes during oxidation. Mass spectrometry revealed water production during the catalytic process, highlighting a correlation between surface restructuring and reactivity. These findings advance the understanding of redox dynamics in noble metal catalysts and provide a theoretical basis for the design of more efficient and stable catalytic systems. |
| format | Article |
| id | doaj-art-fa9b8aa397f14100933cb1820e2d917c |
| institution | DOAJ |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj-art-fa9b8aa397f14100933cb1820e2d917c2025-08-20T02:42:46ZengMDPI AGCrystals2073-43522025-02-0115321510.3390/cryst15030215In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> CatalystsYuye Li0Jianyu Cao1Zhongshi Zhang2Jing Xia3Xiangmin Meng4Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaHeterogeneous catalysis has significant applications in energy conversion, chemical production, and environmental treatment. Among them, the supported catalyst Pt/CeO<sub>2</sub> has attracted much attention due to its high catalytic activity and stability. While the particle size of the catalyst strongly influences its performance, the dynamic behavior and the underlying mechanism of the particle size effect under realistic reactions have not been fully clarified. Using in situ transmission electron microscopy and mass spectrometry, we systematically investigated the size-dependent surface restructuring of Pt nanoparticles supported on CeO<sub>2</sub> in high-temperature redox environments. Larger Pt nanoparticles exhibited significant surface fluctuations during oxidation, which could be reconstructed under reducing conditions, with a slight rotation after the reaction cycle. In contrast, smaller Pt particles demonstrated greater stability, maintaining a constant size after the reaction while their surface structures continuously restructured into low-index crystal planes during oxidation. Mass spectrometry revealed water production during the catalytic process, highlighting a correlation between surface restructuring and reactivity. These findings advance the understanding of redox dynamics in noble metal catalysts and provide a theoretical basis for the design of more efficient and stable catalytic systems.https://www.mdpi.com/2073-4352/15/3/215in situ TEMPt/CeO<sub>2</sub>particle size effectredox dynamics |
| spellingShingle | Yuye Li Jianyu Cao Zhongshi Zhang Jing Xia Xiangmin Meng In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts Crystals in situ TEM Pt/CeO<sub>2</sub> particle size effect redox dynamics |
| title | In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts |
| title_full | In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts |
| title_fullStr | In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts |
| title_full_unstemmed | In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts |
| title_short | In Situ Observation of Redox Dynamics and Surface Restructuring on Pt/CeO<sub>2</sub> Catalysts |
| title_sort | in situ observation of redox dynamics and surface restructuring on pt ceo sub 2 sub catalysts |
| topic | in situ TEM Pt/CeO<sub>2</sub> particle size effect redox dynamics |
| url | https://www.mdpi.com/2073-4352/15/3/215 |
| work_keys_str_mv | AT yuyeli insituobservationofredoxdynamicsandsurfacerestructuringonptceosub2subcatalysts AT jianyucao insituobservationofredoxdynamicsandsurfacerestructuringonptceosub2subcatalysts AT zhongshizhang insituobservationofredoxdynamicsandsurfacerestructuringonptceosub2subcatalysts AT jingxia insituobservationofredoxdynamicsandsurfacerestructuringonptceosub2subcatalysts AT xiangminmeng insituobservationofredoxdynamicsandsurfacerestructuringonptceosub2subcatalysts |