What is the principle of metal hydrogen storage materials? Can organometallic composites be used as hydrogen storage materials?

1 introduction hydrogen is considered as an ideal energy source in 2 1 century because of its cleanliness and high efficiency. Solving the problem of hydrogen storage is a key link in the popularization and application of hydrogen energy. In order to meet the practical requirements of power application, IEA (International Energy Association) requires that the practical standard of hydrogen storage unit is that the hydrogen storage capacity is more than 5% (mass) and the hydrogen release temperature is lower than 423 K[ 1]. In order to achieve this goal, since 1997, the research focus in the field of hydrogen storage materials has been extended from the traditional metal hydride (hydrogen storage alloy) to the new micro-nano structure hydrogen storage materials and metal complex hydride hydrogen storage materials. In 1997, Bogdanovic et al. [2] reported that after doping 2% (mol) Ti(O(CH2)3CH3)4 into NaAlH4 as a catalyst, the reversible hydrogen absorption and desorption reaction can be realized at about 150℃, which aroused people's interest in the study of hydrogen storage performance of light metal complex hydride represented by NaAlH4. NaAlH4 and LiAlH4 have attracted much attention because of their high hydrogen content. In this paper, the principle of hydrogen absorption and desorption of NaAlH4 and LiAlH4 aluminum hydride, the influence of the types of doped catalysts and preparation process on their performance, and the research progress of thermodynamics and kinetics of hydrogen absorption and desorption are emphatically expounded. 2 NaAlH4 hydrogen storage material NaAlH4 is white crystal. ..