Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode
Oxygen vacancies play crucial roles in defining physical and chemical properties of materials to enhance the performances in electronics, solar cells, catalysis, sensors, and energy conversion and storage. Conventional approaches to incorporate oxygen defects mainly rely on reducing the oxygen parti...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/139019 |
| _version_ | 1811696071130218496 |
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| author | Zhang, Wei Cai, Lingfeng Cao, Shengkai Qiao, Liang Zeng, Yi Zhu, Zhiqiang Lv, Zhisheng Xia, Huarong Zhong, Lixiang Zhang, Hongwei Ge, Xiang Wei, Jiaqi Xi, Shibo Du, Yonghua Li, Shuzhou Chen, Xiaodong |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhang, Wei Cai, Lingfeng Cao, Shengkai Qiao, Liang Zeng, Yi Zhu, Zhiqiang Lv, Zhisheng Xia, Huarong Zhong, Lixiang Zhang, Hongwei Ge, Xiang Wei, Jiaqi Xi, Shibo Du, Yonghua Li, Shuzhou Chen, Xiaodong |
| author_sort | Zhang, Wei |
| collection | NTU |
| description | Oxygen vacancies play crucial roles in defining physical and chemical properties of materials to enhance the performances in electronics, solar cells, catalysis, sensors, and energy conversion and storage. Conventional approaches to incorporate oxygen defects mainly rely on reducing the oxygen partial pressure for the removal of product to change the equilibrium position. However, directly affecting reactants to shift the reaction toward generating oxygen vacancies is lacking and to fill this blank in synthetic methodology is very challenging. Here, a strategy is demonstrated to create oxygen vacancies through making the reaction energetically more favorable via applying interfacial strain on reactants by coating, using TiO2(B) as a model system. Geometrical phase analysis and density functional theory simulations verify that the formation energy of oxygen vacancies is largely decreased under external strain. Benefiting from these, the obtained oxygen‐deficient TiO2(B) exhibits impressively high level of capacitive charge storage, e.g., ≈53% at 0.5 mV s−1, far surpassing the ≈31% of the unmodified counterpart. Meanwhile, the modified electrode shows significantly enhanced rate capability delivering a capacity of 112 mAh g−1 at 20 C (≈6.7 A g−1), ≈30% higher than air‐annealed TiO2 and comparable to vacuum‐calcined TiO2. This work heralds a new paradigm of mechanical manipulation of materials through interfacial control for rational defect engineering. |
| first_indexed | 2024-10-01T07:33:32Z |
| format | Journal Article |
| id | ntu-10356/139019 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:33:32Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1390192023-07-14T16:04:12Z Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode Zhang, Wei Cai, Lingfeng Cao, Shengkai Qiao, Liang Zeng, Yi Zhu, Zhiqiang Lv, Zhisheng Xia, Huarong Zhong, Lixiang Zhang, Hongwei Ge, Xiang Wei, Jiaqi Xi, Shibo Du, Yonghua Li, Shuzhou Chen, Xiaodong School of Materials Science & Engineering Innovative Centre for Flexible Devices (iFLEX) Engineering::Materials Lithium Ion Battery Fast Charging Oxygen vacancies play crucial roles in defining physical and chemical properties of materials to enhance the performances in electronics, solar cells, catalysis, sensors, and energy conversion and storage. Conventional approaches to incorporate oxygen defects mainly rely on reducing the oxygen partial pressure for the removal of product to change the equilibrium position. However, directly affecting reactants to shift the reaction toward generating oxygen vacancies is lacking and to fill this blank in synthetic methodology is very challenging. Here, a strategy is demonstrated to create oxygen vacancies through making the reaction energetically more favorable via applying interfacial strain on reactants by coating, using TiO2(B) as a model system. Geometrical phase analysis and density functional theory simulations verify that the formation energy of oxygen vacancies is largely decreased under external strain. Benefiting from these, the obtained oxygen‐deficient TiO2(B) exhibits impressively high level of capacitive charge storage, e.g., ≈53% at 0.5 mV s−1, far surpassing the ≈31% of the unmodified counterpart. Meanwhile, the modified electrode shows significantly enhanced rate capability delivering a capacity of 112 mAh g−1 at 20 C (≈6.7 A g−1), ≈30% higher than air‐annealed TiO2 and comparable to vacuum‐calcined TiO2. This work heralds a new paradigm of mechanical manipulation of materials through interfacial control for rational defect engineering. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2020-05-14T14:18:46Z 2020-05-14T14:18:46Z 2019 Journal Article Zhang, W., Cai, L., Cao, S., Qiao, L., Zeng, Y., Zhu, Z., . . . Chen, X. (2019). Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode. Advanced Materials, 31(52), 1906156-. doi:10.1002/adma.201906156 0935-9648 https://hdl.handle.net/10356/139019 10.1002/adma.201906156 31693266 2-s2.0-85074836478 52 31 en Advanced Materials This is the peer reviewed version of the following article: Zhang, W., Cai, L., Cao, S., Qiao, L., Zeng, Y., Zhu, Z., . . . Chen, X. (2019). Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode. Advanced Materials, 31(52), 1906156-. doi:10.1002/adma.201906156, which has been published in final form at https://doi.org/10.1002/adma.201906156. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf |
| spellingShingle | Engineering::Materials Lithium Ion Battery Fast Charging Zhang, Wei Cai, Lingfeng Cao, Shengkai Qiao, Liang Zeng, Yi Zhu, Zhiqiang Lv, Zhisheng Xia, Huarong Zhong, Lixiang Zhang, Hongwei Ge, Xiang Wei, Jiaqi Xi, Shibo Du, Yonghua Li, Shuzhou Chen, Xiaodong Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title | Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title_full | Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title_fullStr | Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title_full_unstemmed | Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title_short | Interfacial lattice‐strain‐driven generation of oxygen vacancies in an aerobic‐annealed TiO2(B) electrode |
| title_sort | interfacial lattice strain driven generation of oxygen vacancies in an aerobic annealed tio2 b electrode |
| topic | Engineering::Materials Lithium Ion Battery Fast Charging |
| url | https://hdl.handle.net/10356/139019 |
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