具有18电子结构的镁基过渡金属氢化物*

本文综述了近年来备受关注的具有18电子结构和高储氢容量的镁基过渡金属氢化物Mg₂NiH₄、Mg₂CoH₅和Mg₂FeH₆的研究进展，特别从材料组成、制备工艺、热力学及动力学性能等方面进行了综合评述。提出了该类金属氢化物在实际应用中存在的一些问题，如吸/放氢温度均较高，反应动力学性能较差，对于Mg₂CoH₅和Mg₂FeH₆的制备较困难，且可逆性不好。最后展望了对于具有18电子结构的镁基过渡金属氢化物在今后研究中的发展方向。

Mg-Based Transition-Metal Complex Hydrides with 18-Electronic Structure

The recent progress of research and development on Mg-based transition-metal complex hydrides Mg₂NiH₄, Mg₂CoH₅ and Mg₂FeH₆ with 18-electrons structure and high hydrogen storage capacities is reviewed. In particular, the composition, synthesis technology, thermodynamic and kinetic properties of Mg₂NiH₄, Mg₂CoH₅ and Mg₂FeH₆ have been addressed. The pending problems on Mg₂NiH₄, Mg₂CoH₅ and Mg₂FeH₆ for practical applications are stated in the aspects of the high-temperature absorption/desorption for hydrogen, the slow reaction kinetics, the difficult preparation of Mg₂CoH₅ and Mg₂FeH₆, and the poor reversibility. Finally, the development trend on Mg-based transition-metal complex hydrides Mg₂NiH₄, Mg₂CoH₅ and Mg₂FeH₆ in the future is prospected. Contents
1 Introduction
2 The Mg-Ni-H system
3 The Mg-Co-H system
4 The Mg-Fe-H system
5 Conclusion and prospects