Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling
<p>Photocatalytic non-oxidative coupling of methane (PNOCM) is a mild and cost-effective method for the production of multicarbon compounds. However, the separation of photogenerated charges and activation of methane (CH<sub>4</sub>) are the main challenges for this reaction. Here,...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2023-08-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2023.9220773 |
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| author | Jinbo Xue Jinyu Li Zhe Sun Huimin Li Huan Chang Xuguang Liu Husheng Jia Qi Li Qianqian Shen |
| author_facet | Jinbo Xue Jinyu Li Zhe Sun Huimin Li Huan Chang Xuguang Liu Husheng Jia Qi Li Qianqian Shen |
| author_sort | Jinbo Xue |
| collection | DOAJ |
| description | <p>Photocatalytic non-oxidative coupling of methane (PNOCM) is a mild and cost-effective method for the production of multicarbon compounds. However, the separation of photogenerated charges and activation of methane (CH<sub>4</sub>) are the main challenges for this reaction. Here, single crystal-like TiO<sub>2</sub> nanotubes (V<sub>O</sub>-p-TNTs) with oxygen vacancies (V<sub>O</sub>) and preferential orientation were prepared and applied to PNOCM. The results demonstrate that the significantly enhanced photocatalytic performance is mainly related to the strong synergistic effect between preferential orientation and V<sub>O</sub>. The preferential orientation of V<sub>O</sub>-p-TNT along the [001] direction reduces the formation of complex centers at grain boundaries as the form of interfacial states and potential barriers, which improves the separation and transport of photogenerated carriers. Meanwhile, V<sub>O</sub> provides abundant coordination unsaturated sites for CH<sub>4</sub> chemisorption and also acts as electron traps to hinder the recombination of electrons and holes, establishing an effective electron transfer channel between the adsorbed CH<sub>4</sub> molecule and photocatalyst, thus weakening the C–H bond. In addition, the introduction of V<sub>O</sub> broadens the light absorption range. As a result, V<sub>O</sub>-p-TNT exhibits excellent PNOCM performance and provides new insights into catalyst design for CH<sub>4</sub> conversion.</p> |
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| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-11T19:02:25Z |
| publishDate | 2023-08-01 |
| publisher | Tsinghua University Press |
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| series | Journal of Advanced Ceramics |
| spelling | doaj.art-6cf7da9b06b34ef4a874f72c7c1f6c102023-10-10T11:18:12ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082023-08-011281577159210.26599/JAC.2023.9220773Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative couplingJinbo Xue0Jinyu Li1Zhe Sun2Huimin Li3Huan Chang4Xuguang Liu5Husheng Jia6Qi Li7Qianqian Shen8Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaSchool of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China<p>Photocatalytic non-oxidative coupling of methane (PNOCM) is a mild and cost-effective method for the production of multicarbon compounds. However, the separation of photogenerated charges and activation of methane (CH<sub>4</sub>) are the main challenges for this reaction. Here, single crystal-like TiO<sub>2</sub> nanotubes (V<sub>O</sub>-p-TNTs) with oxygen vacancies (V<sub>O</sub>) and preferential orientation were prepared and applied to PNOCM. The results demonstrate that the significantly enhanced photocatalytic performance is mainly related to the strong synergistic effect between preferential orientation and V<sub>O</sub>. The preferential orientation of V<sub>O</sub>-p-TNT along the [001] direction reduces the formation of complex centers at grain boundaries as the form of interfacial states and potential barriers, which improves the separation and transport of photogenerated carriers. Meanwhile, V<sub>O</sub> provides abundant coordination unsaturated sites for CH<sub>4</sub> chemisorption and also acts as electron traps to hinder the recombination of electrons and holes, establishing an effective electron transfer channel between the adsorbed CH<sub>4</sub> molecule and photocatalyst, thus weakening the C–H bond. In addition, the introduction of V<sub>O</sub> broadens the light absorption range. As a result, V<sub>O</sub>-p-TNT exhibits excellent PNOCM performance and provides new insights into catalyst design for CH<sub>4</sub> conversion.</p>https://www.sciopen.com/article/10.26599/JAC.2023.9220773tio<sub>2</sub> nanotubes (tnts)oxygen vacancies (v<sub>o</sub>)preferential orientationphotocatalytic non-oxidative coupling of methane (pnocm) |
| spellingShingle | Jinbo Xue Jinyu Li Zhe Sun Huimin Li Huan Chang Xuguang Liu Husheng Jia Qi Li Qianqian Shen Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling Journal of Advanced Ceramics tio<sub>2</sub> nanotubes (tnts) oxygen vacancies (v<sub>o</sub>) preferential orientation photocatalytic non-oxidative coupling of methane (pnocm) |
| title | Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling |
| title_full | Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling |
| title_fullStr | Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling |
| title_full_unstemmed | Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling |
| title_short | Oxygen vacancy self-doped single crystal-like TiO<sub>2</sub> nanotube arrays for efficient light-driven methane non-oxidative coupling |
| title_sort | oxygen vacancy self doped single crystal like tio sub 2 sub nanotube arrays for efficient light driven methane non oxidative coupling |
| topic | tio<sub>2</sub> nanotubes (tnts) oxygen vacancies (v<sub>o</sub>) preferential orientation photocatalytic non-oxidative coupling of methane (pnocm) |
| url | https://www.sciopen.com/article/10.26599/JAC.2023.9220773 |
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