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- Title
Two-dimensional vanadium nanosheets as a remarkably effective catalyst for hydrogen storage in MgH2.
- Authors
Lu, Zhi-Yu; Yu, Hai-Jie; Lu, Xiong; Song, Meng-Chen; Wu, Fu-Ying; Zheng, Jia-Guang; Yuan, Zhi-Fei; Zhang, Liu-Ting
- Abstract
Magnesium hydride (MgH2), which possesses high hydrogen density of 7.6 wt%, abundant resource and non-toxicity, has captured intense attention as one of the potential hydrogen storage materials. However, the practical application of Mg/MgH2 system is suffering from high thermal stability, sluggish absorption and desorption kinetics. Herein, two-dimensional (2D) vanadium nanosheets (VNS) were successfully prepared via a facile wet chemical ball milling method and proved to be highly effective on improving the hydrogen storage performance of MgH2. For instance, the MgH2 + 7 wt% VNS composite began to release hydrogen at 187.2 °C, 152 °C lower than that of additive-free MgH2. At 300 °C, 6.3 wt% hydrogen was released from the MgH2 + 7 wt% VNS composite within 10 min. In addition, the fully dehydrogenated sample could absorb hydrogen even at room temperature under hydrogen pressure of 3.2 MPa. X-ray diffractometer (XRD) and transmission electron microscopy (TEM) results confirmed metallic vanadium served as catalytic unit for facilitating the de/rehydrogenation reaction of MgH2. This finding presents an example of facile synthesis of two-dimensional (2D) vanadium with excellent catalysis, which may shed light on future design and preparation of highly effective layered catalysts for hydrogen storage and other energy-related areas.
- Publication
Rare Metals, 2021, Vol 40, Issue 11, p3195
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-021-01764-7