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.
摘要
氢化镁 (MgH2) 的储氢容量高达7.6 wt%, 而且镁在地壳中资源丰富,同时具有无毒等优点, 因此MgH2是一种极具应用潜力的储氢材料。然而, Mg/MgH2体系在实际应用中存在热稳定性高、吸附和解吸动力学缓慢等问题。本文采用一种简便的湿化学球磨方法成功制备了二维的钒纳米片 (VNS), 并证明其对MgH2的储氢性能有很好的改善作用。例如, MgH2+7 wt% VNS复合材料在187.2 °C时开始释放氢气, 比不添加催化剂的MgH2初始放氢温度低152 °C。在300 °C下, MgH2+7 wt%VNS复合材料在10分钟内释放出6.3 wt%的氢气, 并且完全脱氢的样品即使在室温和3.2 MPa的氢压下也能吸收氢气。XRD和TEM结果证实金属钒是促进MgH2脱氢以及再加氢反应的催化单元。本文提供了一种合成具有优良催化性能二维钒纳米片的简便方法, 这可能对未来设计和制备用于储氢和其他能源相关领域的层状催化剂有一定的指导意义。
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This study was financially supported by the National Natural Science Foundation of China (No. 51801078) and the Natural Science Foundation of Jiangsu Province (No. BK20180986).
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Lu, ZY., Yu, HJ., Lu, X. et al. Two-dimensional vanadium nanosheets as a remarkably effective catalyst for hydrogen storage in MgH2. Rare Met. 40, 3195–3204 (2021). https://doi.org/10.1007/s12598-021-01764-7
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DOI: https://doi.org/10.1007/s12598-021-01764-7