Improved desorption temperature of magnesium hydride via multi-layering Mg/Fe thin film
Improved desorption temperature of magnesium hydride via multi-layering Mg/Fe thin film
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多层Mg/Fe薄膜提高氢化镁的脱附温度
DOI：
10.1016/j.ijhydene.2020.10.178
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发表时间：
2021-01-06
影响因子：
7.2
通讯作者：
Notomi, Mitsuo
中科院分区：
文献类型：
--
作者：
Majid, Noor Aliah Abdul;Watanabe, Junpei;Notomi, Mitsuo
研究了Pd包覆Fe纳米约束薄膜中Mg的吸氢性能。使用两种沉积薄膜的方法，即，电阻加热法和脉冲激光沉积（PLD）法。在通过电阻加热制备的最薄的Mg膜中，观察到氢含量在所有样品中最高，并且氢解吸温度为230 ℃。采用脉冲激光沉积法制备了Mg/Fe纳米约束多层膜。通过PLD方法制备的具有12层Mg/Fe层的Mg膜的氢脱附温度显著降低至155 ℃，并且与具有相同总厚度的仅几层的Mg/Fe相比，储氢能力提高。研究表明，脱附温度与薄膜厚度相关，薄膜越薄，脱附温度越低。此外，Mg与Fe的多层结构提高了Pd的脱附温度和放氢容量，这是由于较高的晶界密度在加氢和脱氢过程中充当了Pd的扩散通道。(C)2020年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Hydrogen sorption property of Mg in Pd-capped thin film nanoconfined with Fe is investigated. Two methods of depositing the thin films were utilised, i.e., resistive heating method and pulsed laser deposition (PLD) method. In the thinnest Mg film prepared by resistive heating, hydrogen content was observed to be the highest among all samples and the hydrogen desorption temperature is 230 degrees C. Using pulsed laser deposition method, Mg/Fe nanoconfined multilayers are easily prepared. The hydrogen desorption temperature of Mg film with 12 Mg/Fe layers prepared via PLD method was significantly reduced to 155 degrees C, and the hydrogen storage capacity is improved as compared to the Mg/Fe with only several layers of same overall thickness. This study showed that the desorption temperatures correlate with the film thickness, thinner films react with hydrogen at lower temperatures. In addition, multi-layering Mg with Fe improves the desorption temperatures and hydrogen capacity, due to the higher grain boundary density, which acts as diffusion pathways for Pd in hydrogenation and dehydrogenation process. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.