Electronic Principles of Hydrogen Incorporation and Dynamics in Metal Hydrides

Crystals

Nenad Ivanović¹  Nikola Novaković¹  Ivana Radisavljević¹  Ljiljana Matović¹ 

[1] Vinča Institute of Nuclear Sciences, University of Belgrade, 11001 Belgrade, Serbia;

关键词: hydrogen storage;    metal hydrides;    MgH₂;    complex hydrides;    Li-amide/imide;    electronic structure;    ab initio calculation;    DFT;    sorption kinetics;    catalysts;   

DOI  :  10.3390/cryst2031261

来源: mdpi

【 摘 要 】

An approach to various metal hydrides based on electronic principles is presented. The effective medium theory (EMT) is used to illustrate fundamental aspects of metal-hydrogen interaction and clarify the most important processes taking place during the interaction. The elaboration is extended using the numerous existing results of experiment and calculations, as well as using some new material. In particular, the absorption/desorption of H in the Mg/MgH₂ system is analyzed in detail, and all relevant initial structures and processes explained. Reasons for the high stability and slow sorption in this system are noted, and possible solutions proposed. The role of the transition-metal impurities in MgH₂ is briefly discussed, and some interesting phenomena, observed in complex intermetallic compounds, are mentioned. The principle mechanism governing the Li-amide/imide transformation is also discussed. Latterly, some perspectives for the metal-hydrides investigation from the electronic point of view are elucidated.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.