DFT study of crystal structure and electronic properties of metal-doped AlH3 polymorphs

被引：14
作者：
Dragojlovic, M. [1 ]
Radakovic, J. [1 ,2 ]
Batalovic, K. [1 ,2 ]
机构：
[1] Univ Belgrade, Vinca Inst Nucl Sci, Dept Nucl & Plasma Phys, Natl Inst Republ Serbia, POB 522, Belgrade 11001, Serbia
[2] Ctr Excellence Hydrogen & Renewable Energy CONVIN, Belgrade, Serbia
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2022年 / 47卷 / 09期
关键词：
AlH3; Hydrogen storage; DFT; Metal dopant; Hydride stability; HYDROGEN DESORPTION-KINETICS; X-RAY-DIFFRACTION; THERMAL-DECOMPOSITION; STORAGE MATERIALS; GAMMA-POLYMORPHS; TRANSITION-METAL; 1ST PRINCIPLES; TI; DEHYDROGENATION; NI;
D O I：
10.1016/j.ijhydene.2021.11.213
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
AlH3 has been considered for a long time as a hydrogen storage material with suitable gravimetric and volumetric density for practical applications. Among eight AlH3 polymorphs observed so far, in this work we focus our attention on an investigation of the effects of various metal dopants in a- and 13-AlH3, to perceive a way of enhancing them. Substitutional incorporation of the metal dopants (Li, Sc, Ti, Cu, Cr, Fe, Nb, Mo, Zn, or Zr) is considered, as well as interstitial doping with Li, Sc, Ti, Cu, and Zr. The density functional theory (DFT) (using GGA-PW91) approach is used to address the crystal structure, bonding, dopant stability, and changes in hydrogen desorption energy. In addition, the kinetics of hydrogen desorption is also considered for several interstitially doped cases, by calculating the stability of native point defects. Promising results are presented for Zr, Ti, and Sc doped hydrides. Doped hydrides, here studied, are considered as n- or p-type semiconducting materials, enabling wider application overcoming hydrogen storage scope. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6142 / 6153
页数：12
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