通过反应机械研磨添加镍、四氢铝钠、钛和碳纳米管提高氢化镁的储氢性能

Enhancement of the Hydrogen-Storage Properties of MgH2 by the Addition of Ni, NaAlH4, Ti, and CNT via Reactive Mechanical Grinding.

作者信息

Kwak Young Jun, Lee Seong Ho, Lee Byung-Soo, Park Hye Ryoung, Song Myoung Youp

出版信息

J Nanosci Nanotechnol. 2015 Nov;15(11):8763-72. doi: 10.1166/jnn.2015.11533.

DOI:10.1166/jnn.2015.11533

Abstract

MgH2 was used as the starting material in this study. A sample with the composition of 84 wt% MgH2 + 10 wt% Ni + 2 wt% NaAlH4 + 2 wt% Ti + 2 wt% CNT (named MgH2-10Ni-2NaAIH4-2Ti-2CNT) was prepared by the reactive mechanical grinding. Hydriding and dehydriding property measurements, X-ray diffraction (XRD) analyses, and microstructural observations were then performed. The activation of the sample was not required. At the first cycle (n = 1), the sample absorbed 2.84 wt% H for 5 min, 3.75 wt% H for 10 min, 4.09 wt% H for 15 min, and 4.17 wt% H for 60 min at 593 K under 12 bar H2. The MgH2-10Ni-2NaAlH4-2Ti-2CNT sample showed quite a high hydriding rate at a relatively low temperature of 423 K under 12 bar H2 (at n = 4), absorbing 2.81 wt% H for 5 min, 3.23 wt% H for 10 min, and 3.56 wt% H for 60 min. The reactive mechanical grinding of MgH2 with Ni, NaAlH4, Ti, and CNT is considered to create defects on the surface and in the interior of MgH2 as well as decrease the particle size of MgH2-

摘要

本研究以MgH₂作为起始原料。通过反应机械研磨制备了一种成分含量为84 wt% MgH₂ + 10 wt% Ni + 2 wt% NaAlH₄ + 2 wt% Ti + 2 wt% CNT的样品（命名为MgH₂-10Ni-2NaAIH₄-2Ti-2CNT）。随后进行了吸氢和脱氢性能测量、X射线衍射（XRD）分析以及微观结构观察。该样品无需活化。在第一个循环（n = 1）时，样品在593 K、12 bar H₂条件下，5分钟吸收2.84 wt%的H，10分钟吸收3.75 wt%的H，15分钟吸收4.09 wt%的H，60分钟吸收4.17 wt%的H。MgH₂-10Ni-2NaAlH₄-2Ti-2CNT样品在423 K、12 bar H₂的相对低温下（n = 4）表现出相当高的吸氢速率，5分钟吸收2.81 wt%的H，10分钟吸收3.23 wt%的H，60分钟吸收3.56 wt%的H。MgH₂与Ni、NaAlH₄、Ti和CNT的反应机械研磨被认为会在MgH₂的表面和内部产生缺陷，同时减小MgH₂的颗粒尺寸。