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Vol. 14 (2022)

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

https://doi.org/10.1007/s40820-022-00891-9
Li Ren
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Wen Zhu
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Yinghui Li
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Xi Lin
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Hao Xu
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Fengzhan Sun
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Chong Lu
Instrumental Analysis Center of SJTU, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Jianxin Zou
National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China

Corresponding Author: Jianxin Zou

zoujx@sjtu.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 144

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.


Highlights:


1 A MgH2/TiO2 heterostructure with nano MgH2 assembled on oxygen vacancy-rich 2D TiO2 nanosheets was successfully fabricated via a simple solvothermal strategy.
2 The MgH2/TiO2 heterostructure shows rapid desorption kinetics, low dehydrogenation temperature, and excellent cycling stability.
3 In situ HRTEM observations and ex situ XPS analyses reveal that multi-valance of Ti species, presence of abundant oxygen vacancies, formation of catalytic Mg-Ti oxides, and confinement of TiO2 nanosheets, contribute to the high stability and kinetically accelerated hydrogen sorption performances of Mg.

Keywords

Hydrogen storage MgH2 TiO2 nanosheets Oxygen vacancies Nanoconfinement
Ren, Li, Wen Zhu, Yinghui Li, Xi Lin, Hao Xu, Fengzhan Sun, Chong Lu, and Jianxin Zou. 2022. “Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2”. Nano-Micro Letters 14 (July):144. https://doi.org/10.1007/s40820-022-00891-9.
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