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Optimizing FeCoNiCrTi high-entropy alloy with hydrogen pumping effect to boost de/hydrogenation performance of magnesium hydride

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Abstract

The exploration of efficient, long-lived and cost-effective transition metal catalysts is highly desirable for the practical hydrogen storage of magnesium hydride (MgH2) in sustainable energy devices. Herein, FeCoNiCrTi high-entropy alloy (HEA) nanosheets were prepared via a facile wet chemical ball milling strategy and they were introduced into MgH2 to boost the hydrogen storage performance. The refined HEA exhibited superior catalytic activity on MgH2. In contrast to additive-free MgH2, the initial desorption temperature of the constructed MgH2-HEA composite was reduced from 330.0 to 198.5 °C and a remarkable 51% reduction in the dehydrogenation activation energy was achieved. Besides, the MgH2-HEA composite only required one-twentieth time of that consumed by pure MgH2 to absorb 5.0 wt% of H2 at 225 °C. The synergy between the “hydrogen pumping” effect of Mg2Ni/Mg2NiH4 and Mg2Co/Mg2CoH5 couples, as well as the good dispersion of Fe, Cr and Ti on the surface of MgH2 contributed to the enhanced de/hydrogenation performance of the MgH2-HEA composites. This study furnishes important steering for the design and fabrication of multiple transition metal catalysts and may push the commercial application of magnesium-based hydrides one step forward.

Graphical abstract

摘要

探索高效、长寿命和高性价比的过渡金属催化剂对于氢化镁（MgH2）在可持续能源设备中的实际应用具有重要意义。在此，我们通过简单的湿化学球磨策略设计合成了FeCoNiCrTi高熵合金（HEA）纳米片，并将其引入到MgH2中以提高其储氢性能。实验结果表明HEA在MgH2的储氢性能中表现出卓越的催化活性。MgH2-HEA复合材料的初始解吸温度从MgH2的330.0 ℃降低到198.5 ℃，脱氢活化能显著降低51%。此外，MgH2-HEA复合材料在225 ℃时吸收5.0 wt% 氢气的时间是MgH2所需时间的二十分之一。微结构分析结果揭示Mg2Ni/Mg2NiH4、Mg2Co/Mg2CoH5对以及Fe、Cr和Ti催化位点的协同“氢泵”效应提高了MgH2-HEA复合材料的吸放氢性能。本研究可为多元高效过渡金属催化剂的设计和制备提供实验指导，进一步推进镁基氢化物储氢材料的商业化应用。

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Acknowledgements

The authors appreciatively acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51801078).

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  1. School of Energy and Power, Instrumental Analysis Center, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Meng-Chen Song, Fu-Ying Wu, Xiu-Zhen Wang & Liu-Ting Zhang

  2. Max Planck Institute for Iron Research, 40237, Düsseldorf, Germany

    Yi-Qun Jiang

  3. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Li-Xin Chen

  4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Hu Zhao & Liu-Ting Zhang

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Song, MC., Wu, FY., Jiang, YQ. et al. Optimizing FeCoNiCrTi high-entropy alloy with hydrogen pumping effect to boost de/hydrogenation performance of magnesium hydride. Rare Met. 43, 3273–3285 (2024). https://doi.org/10.1007/s12598-024-02703-y

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