Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2
Abstract MgH2 has attracted intensive interests as one of the most promising hydrogen storage materials. Nevertheless, the high desorption temperature, sluggish kinetics, and rapid capacity decay hamper its commercial application. Herein, 2D TiO2 nanosheets with abundant oxygen vacancies are used to...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-07-01
|
| Series: | Nano-Micro Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40820-022-00891-9 |
| _version_ | 1811294603140136960 |
|---|---|
| author | Li Ren Wen Zhu Yinghui Li Xi Lin Hao Xu Fengzhan Sun Chong Lu Jianxin Zou |
| author_facet | Li Ren Wen Zhu Yinghui Li Xi Lin Hao Xu Fengzhan Sun Chong Lu Jianxin Zou |
| author_sort | Li Ren |
| collection | DOAJ |
| description | Abstract MgH2 has attracted intensive interests as one of the most promising hydrogen storage materials. Nevertheless, the high desorption temperature, sluggish kinetics, and rapid capacity decay hamper its commercial application. Herein, 2D TiO2 nanosheets with abundant oxygen vacancies are used to fabricate a flower-like MgH2/TiO2 heterostructure with enhanced hydrogen storage performances. Particularly, the onset hydrogen desorption temperature of the MgH2/TiO2 heterostructure is lowered down to 180 °C (295 °C for blank MgH2). The initial desorption rate of MgH2/TiO2 reaches 2.116 wt% min−1 at 300 °C, 35 times of the blank MgH2 under the same conditions. Moreover, the capacity retention is as high as 98.5% after 100 cycles at 300 °C, remarkably higher than those of the previously reported MgH2-TiO2 composites. Both in situ HRTEM observations and ex situ XPS analyses confirm that the synergistic effects from multi-valance of Ti species, accelerated electron transportation caused by oxygen vacancies, formation of catalytic Mg-Ti oxides, and stabilized MgH2 NPs confined by TiO2 nanosheets contribute to the high stability and kinetically accelerated hydrogen storage performances of the composite. The strategy of using 2D substrates with abundant defects to support nano-sized energy storage materials to build heterostructure is therefore promising for the design of high-performance energy materials. |
| first_indexed | 2024-04-13T05:19:53Z |
| format | Article |
| id | doaj.art-1e12181a63c44d65891858010abe9f7f |
| institution | Directory Open Access Journal |
| issn | 2311-6706 2150-5551 |
| language | English |
| last_indexed | 2024-04-13T05:19:53Z |
| publishDate | 2022-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nano-Micro Letters |
| spelling | doaj.art-1e12181a63c44d65891858010abe9f7f2022-12-22T03:00:47ZengSpringerOpenNano-Micro Letters2311-67062150-55512022-07-0114111610.1007/s40820-022-00891-9Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2Li Ren0Wen Zhu1Yinghui Li2Xi Lin3Hao Xu4Fengzhan Sun5Chong Lu6Jianxin Zou7National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityInstrumental Analysis Center of SJTU, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong UniversityAbstract MgH2 has attracted intensive interests as one of the most promising hydrogen storage materials. Nevertheless, the high desorption temperature, sluggish kinetics, and rapid capacity decay hamper its commercial application. Herein, 2D TiO2 nanosheets with abundant oxygen vacancies are used to fabricate a flower-like MgH2/TiO2 heterostructure with enhanced hydrogen storage performances. Particularly, the onset hydrogen desorption temperature of the MgH2/TiO2 heterostructure is lowered down to 180 °C (295 °C for blank MgH2). The initial desorption rate of MgH2/TiO2 reaches 2.116 wt% min−1 at 300 °C, 35 times of the blank MgH2 under the same conditions. Moreover, the capacity retention is as high as 98.5% after 100 cycles at 300 °C, remarkably higher than those of the previously reported MgH2-TiO2 composites. Both in situ HRTEM observations and ex situ XPS analyses confirm that the synergistic effects from multi-valance of Ti species, accelerated electron transportation caused by oxygen vacancies, formation of catalytic Mg-Ti oxides, and stabilized MgH2 NPs confined by TiO2 nanosheets contribute to the high stability and kinetically accelerated hydrogen storage performances of the composite. The strategy of using 2D substrates with abundant defects to support nano-sized energy storage materials to build heterostructure is therefore promising for the design of high-performance energy materials.https://doi.org/10.1007/s40820-022-00891-9Hydrogen storageMgH2TiO2 nanosheetsOxygen vacanciesNanoconfinement |
| spellingShingle | Li Ren Wen Zhu Yinghui Li Xi Lin Hao Xu Fengzhan Sun Chong Lu Jianxin Zou Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 Nano-Micro Letters Hydrogen storage MgH2 TiO2 nanosheets Oxygen vacancies Nanoconfinement |
| title | Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 |
| title_full | Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 |
| title_fullStr | Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 |
| title_full_unstemmed | Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 |
| title_short | Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2 |
| title_sort | oxygen vacancy rich 2d tio2 nanosheets a bridge toward high stability and rapid hydrogen storage kinetics of nano confined mgh2 |
| topic | Hydrogen storage MgH2 TiO2 nanosheets Oxygen vacancies Nanoconfinement |
| url | https://doi.org/10.1007/s40820-022-00891-9 |
| work_keys_str_mv | AT liren oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT wenzhu oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT yinghuili oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT xilin oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT haoxu oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT fengzhansun oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT chonglu oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 AT jianxinzou oxygenvacancyrich2dtio2nanosheetsabridgetowardhighstabilityandrapidhydrogenstoragekineticsofnanoconfinedmgh2 |