Abstract A new LaMg4Cu intermetallic compound with hexagonal UCoAl4 type structure is prepared by induction melting and subsequent heating treatment. The compound rapidly absorb 3.3 wt% hydrogen at 573 K under 4.0 MPa H2 for the first cycle, leading to phase segregation into LaH3, MgH2 and MgCu2. The reversible dehydrogenation capacity is 2.6 wt% at 523 K, forming a mixture of LaH2, Mg and Mg2Cu. The PCT curves show two plateaus corresponding to the formation of Mg and Mg2Cu, respectively. Compared with mechanically manufactured Mg and bulk Mg2Cu alloy, our in-situ generated LaH2, Mg and Mg2Cu mixture exhibits excellent kinetics and cycling properties, which is mainly attributed to the La-Mg-Cu-H nanostructures via the hydrogen-induced decomposition of LaMg4Cu intermetallic compounds.

中文翻译：

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LaMg 4 Cu 的储氢性能

摘要 通过感应熔炼和后续热处理制备了一种具有六方UCoAl4型结构的新型LaMg4Cu金属间化合物。在第一次循环中，该化合物在 573 K 和 4.0 MPa H2 下快速吸收 3.3 wt% 的氢，导致相分离为 LaH3、MgH2 和 MgCu2。可逆脱氢能力在 523 K 时为 2.6 wt%，形成 LaH2、Mg 和 Mg2Cu 的混合物。PCT 曲线显示了两个平台，分别对应于 Mg 和 Mg2Cu 的形成。与机械制造的 Mg 和块状 Mg2Cu 合金相比，我们原位生成的 LaH2、Mg 和 Mg2Cu 混合物表现出优异的动力学和循环性能，这主要归因于通过 LaMg4Cu 的氢诱导分解形成的 La-Mg-Cu-H 纳米结构金属间化合物。