A MOF derived multi-phase FeNi3-S catalyst for efficient hydrogen storage in magnesium hydride

作者：Linxin Zheng, Shuai Li, Liuting Zhang, Tao Zhong, Xiuzhen Wang, Ting Bian, Petr Senin, Ying Wu · 发表于：Chinese Chemical Letters · 年份：2024 · DOI：10.1016/j.cclet.2024.110414 · 被引用次数：27 · 研究领域：Hydrogen Storage and Materials、Ammonia Synthesis and Nitrogen Reduction、MXene and MAX Phase Materials

Magnesium hydride (MgH 2 ) demonstrates immense potential as a solid-state hydrogen storage material, while its commercial utilization is impeded by the elevated operating temperature and sluggish reaction kinetics. Herein, a MOF derived multi-phase FeNi 3 -S catalyst was specially designed for efficient hydrogen storage in MgH 2 . Experiments confirmed that the incorporation of FeNi 3 -S into MgH 2 significantly lowered the desorption temperature and accelerated the kinetics of hydrogen desorption and reabsorption. The initial dehydrogenation temperature of the MgH 2 + 10 wt% FeNi 3 -S composite was 202 °C, which was 123 °C lower than that of pure MgH 2 . At 325 °C, the MgH 2 + 10 wt% FeNi 3 -S composite released 6.57 wt% H 2 (fully dehydrogenated) within 1000 s. Remarkably, MgH 2 + 10 wt% FeNi 3 -S composite initiated rehydrogenation at room temperature and rapidly absorbed 2.49 wt% H 2 within 30 min at 100 °C. Moreover, 6.3 wt% H 2 was still retained after 20 cycles at 300 °C, demonstrating the superior cycling performance of the MgH 2 + 10 wt% FeNi 3 -S composite. The activation energy fitting calculations further evidenced the addition of FeNi 3 -S enhanced the de/resorption kinetics of MgH 2 ( E a = 98.6 kJ/mol and 43.3 kJ/mol, respectively). Through phase and microstructural analysis, it was determined that the exceptional hydrogen storage performance of the composite was attributed to the in-situ formation of Mg/Mg 2 Ni + Fe/MgS and MgH 2 /Mg 2 NiH 4 + Fe/MgS hydrogen...