MOF-derived Ni3Fe/Ni/NiFe2O4@C for enhanced hydrogen storage performance of MgH2

作者：Yangping Chen, Bolin Sun, Guoqing Zhang, Siyuan Ni, Canbing Li, Juxiong Tian, Yanrui Zhang, Xinxi Li · 发表于：Journal of Energy Chemistry · 年份：2024 · DOI：10.1016/j.jechem.2024.09.048 · 被引用次数：48 · 研究领域：Hydrogen Storage and Materials、Superconductivity in MgB2 and Alloys、Hybrid Renewable Energy Systems

Magnesium hydride (MgH 2 ) is an important material for hydrogen (H 2 ) storage and transportation owing to its high capacity and reversibility. However, its intrinsic properties have considerably limited its industrial application. In this study, the NiFe-800 catalyst as metal-organic framework (MOF) derivative was first utilized to promote the intrinsic properties of MgH 2 . Compared to pure MgH 2 , which releases 1.24 wt% H 2 in 60 min at 275 °C, the MgH 2 -10 NiFe-800 composite releases 5.85 wt% H 2 in the same time. Even at a lower temperature of 250 °C, the MgH 2 -10 NiFe-800 composite releases 3.57 wt% H 2 , surpassing the performance of pure MgH 2 at 275 °C. Correspondingly, while pure MgH 2 absorbs 2.08 wt% H 2 in 60 min at 125 °C, the MgH 2 -10 NiFe-800 composite absorbs 5.35 wt% H 2 in just 1 min. Remarkably, the MgH 2 -10 NiFe-800 composite absorbs 2.27 wt% H 2 in 60 min at 50 °C and 4.64 wt% H 2 at 75 °C. This indicates that MgH 2 -10 NiFe-800 exhibits optimum performance with excellent kinetics at low temperatures. Furthermore, the capacity of the MgH 2 -10 NiFe-800 composite remains largely stable after 10 cycles. Moreover, the Mg 2 Ni/Mg 2 NiH 4 acts as a “hydrogen pump”, providing effective diffusion channels that enhance the kinetic process of the composite during cycling. Additionally, Fe 0 facilitates electron transfer and creates hydrogen diffusion channels and catalytic sites. Finally, carbon (C) effectively prevents particle agglomeration and maintains ...