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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。
In this paper, the recent progress in the research on magnesium-based transition metal hydrides Mg2NiH4, Mg2CoH5 and Mg2FeH6 with 18-electron structure and high hydrogen storage capacity is reviewed, especially from the aspects of material composition, preparation process, thermodynamics and kinetic properties A comprehensive review. Some problems existed in the practical application of this kind of metal hydride are put forward, such as high temperature of hydrogen absorption / desorption and poor reaction kinetics, which makes the preparation of Mg2CoH5 and Mg2FeH6 difficult and the reversibility is not good. Finally, the development direction of Mg-based transition metal hydride with 18 electronic structure in the future research is prospected.