Citation: LAN Zhi-Qiang, XIAO Xiao, SU Xin, CHEN Jie-Shi, GUO Jin. Effect of Doping with Aluminium on the Electronic Structure and Hydrogen Storage Properties of Mg₂Ni Alloy[J]. Acta Physico-Chimica Sinica, ;2012, 28(08): 1877-1884. doi: 10.3866/PKU.WHXB201205281 shu

Effect of Doping with Aluminium on the Electronic Structure and Hydrogen Storage Properties of Mg₂Ni Alloy

1.
Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, College of Physical Science and Technology, Guangxi University, Nanning 530004, P. R. China

Received Date: 28 January 2012
Available Online: 28 May 2012
Fund Project: 国家自然科学基金(51071054, 50861003) (51071054, 50861003) 广西科学基金重点项目(2010GXNSFD013004) (2010GXNSFD013004)

Using plane wave pseudopotential methods based on density functional theory, the unit cell volumes, the electronic densities of states, the bond orders, the charge populations, and the formation enthalpies of Mg_2-xAl_xNiH₄ (x=0, 0.125, 0.25) alloys were calculated. By analyzing atom bonding and structural stability, the effects of partially substituting Al for Mg on the structure and hydrogen storage property of the alloys and their hydrides were investigated. It was shown that the unit cell volume of the Mg₂Ni alloy decreases with the increase of Al content; the decreased unit cell volume hinders the incorporation of hydrogen atoms, thus reducing the hydrogen storage capacity. For Mg_2-xAl_xNiH₄ (x=0, 0.125, 0.25) hydrides, the Mg-H and Al-H interactions are much weaker than the Ni-H interaction. However, the Ni-H interaction is weakened and the hydride enthalpy of formation decreases with increased Al content. Although the stability of the hydride structure is weakened, hydrogen desorption kinetics for the Mg₂Ni hydride can be improved with the partial substitution of Al for Mg.
- First-principles,
- Mg₂Ni Alloy,
- Hydrogen-storage property,
- Electronic structure,
- Density of states
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Doping with Aluminium on the Electronic Structure and Hydrogen Storage Properties of Mg2Ni Alloy

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通讯作者: 陈斌, bchen63@163.com

Effect of Doping with Aluminium on the Electronic Structure and Hydrogen Storage Properties of Mg₂Ni Alloy