用于可逆储氢的镁镍氢化物单晶纳米粒子

Yingyan Zhao, Yunfeng Zhu, Rui Shi, Jiguang Zhang, Yana Liu, Jun Wang, Liquan Li
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引用次数: 0

摘要

虽然镁基氢化物被广泛认为是固态储氢和清洁能源载体的前景材料,但其工作温度高、动力学速度慢是实际应用的主要挑战。本文通过气固制备工艺,采用纳米化和合金化双重改性策略,成功制备了一种镁镍基氢化物--Mg2NiH4 纳米颗粒(∼100 nm)。研究表明,Mg2NiH4 纳米粒子通过定向堆叠形成了独特的链状结构,并表现出惊人的储氢性能:它在 170 ℃ 开始释放 H2,在 230 ℃ 以下释放完毕,饱和容量为 3.32 wt%,在 200 ℃ 下 1800 秒内解吸 3.14 wt%的 H2。对不同状态下的 Mg2NiH4 纳米颗粒进行的系统表征揭示了其脱氢行为,并证明了其在脱氢/氢化过程中具有优异的结构稳定性和储氢稳定性。相信这项研究将为优化金属氢化物的动力学性能提供新的见解,并为设计高活性、高稳定性的储氢合金提供新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Magnesium nickel hydride monocrystalline nanoparticles for reversible hydrogen storage

Magnesium nickel hydride monocrystalline nanoparticles for reversible hydrogen storage

Although Mg-based hydrides are extensively considered as a prospective material for solid-state hydrogen storage and clean energy carriers, their high operating temperature and slow kinetics are the main challenges for practical application. Here, a Mg–Ni based hydride, Mg2NiH4 nanoparticles (∼100 nm), with dual modification strategies of nanosizing and alloying is successfully prepared via a gas-solid preparation process. It is demonstrated that Mg2NiH4 nanoparticles form a unique chain-like structure by oriented stacking and exhibit impressive hydrogen storage performance: it starts to release H2 at ∼170 °C and completes below 230 °C with a saturated capacity of 3.32 wt% and desorbs 3.14 wt% H2 within 1800 s at 200 °C. The systematic characterizations of Mg2NiH4 nanoparticles at different states reveal the dehydrogenation behavior and demonstrate the excellent structural and hydrogen storage stabilities during the de/hydrogenated process. This research is believed to provide new insights for optimizing the kinetic performance of metal hydrides and novel perspectives for designing highly active and stable hydrogen storage alloys.

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材料导报:能源(英文)
材料导报:能源(英文) Renewable Energy, Sustainability and the Environment, Nanotechnology
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