近期，我院教师郑家广（通讯）、张刘挺（通讯），本科生闫成国、鲁旭等的研究成果“Dual-cation K2TaF7 catalyst improves high-capacity hydrogen storage behavior of MgH2”在《International Journal of Hydrogen Energy》（IF=7.139）上发表

近期，我院教师郑家广（通讯）、张刘挺（通讯），本科生闫成国、鲁旭等的研究成果“Dual-cation K₂TaF₇ catalyst improves high-capacity hydrogen storage behavior of MgH₂”在《International Journal of Hydrogen Energy》（IF=7.139）上发表。

论文简介如下：

MgH₂ has been extensively regarded as a low-cost hydrogen storage material with high gravimetric hydrogen capacity of approximately 7.6 wt%. However, the hydrogen release and absorption kinetics in MgH₂ still needs further improving.For the first time, the catalytic impacts of a new dual-cation metal fluoride K₂TaF₇ upon the hydrogen storage characteristics of MgH₂ have been investigated in this work. With only 1 wt% K₂TaF₇ dopant, the initial dehydrogenation temperature of MgH₂ was lowered by about 130 °C, releasing more than 7.3 wt% hydrogen totally. The desorption activation energy of MgH₂ + 1 wt% K₂TaF₇ composite was decreased to 107.2 ± 1.2 kJ·mol^-1. Besides, at 190 °C, the dehydrogenated MgH₂ + 1 wt% K₂TaF₇ sample could absorb 6.56 wt% H₂, while pristine MgH₂ re-absorbed only 3.45 wt% H₂. Further studies revealed that K₂TaF₇ could react with MgH₂ during dehydrogenation and produce symbiotic hydrides KMgH₃ and TaH_0.8, which could play the role of hydrogen pumps during hydrogen release and uptake. The cooperative catalysis between the hydrogen pump effect and the active interface in the multi-hydride area significantly enhanced the reversible hydrogen storage in the MgH₂+1 wt% K₂TaF₇ composite. This study provides new thinking for novel catalysts to elevate the hydrogen storage performance of MgH₂.

全文下载：https://www.sciencedirect.com/science/article/pii/S0360319922054878?via%3Dihub