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• W2955763603 endingPage "22010" @default.
• W2955763603 startingPage "21999" @default.
• W2955763603 abstract "Nanosizing is efficient as the dual-tuning of thermodynamics and kinetics for Mg-based hydrogen storage materials. The in-situ synthesis of nanocomposites through hydrogen-induced decomposition from long-period stacking ordered phase is proved effective to achieve active nano-sized catalysts with uniform dispersion. In this study, the Mg93Cu7-xYx (x = 0.67, 1.33, and 2) alloys with equalized Mg–Mg2Cu eutectic and 14H long-period stacking ordered phase of Mg92Cu3.5Y4.5 are prepared. Its solidification path is determined as α-Mg, 14H–Mg2Cu pair and Mg–Mg2Cu eutectic. The increased Y/Cu atomic ratio lowers the first-cycle hydrogenation rate of the alloys due to the increased 14H–Mg2Cu structure and reduced Mg–Mg2Cu eutectic interfaces. After the hydrogen-induced decomposition of the long-period stacking ordered phase, MgCu2 and YH3 nanoparticles are in-situ formed, and the following activation process significantly accelerates. The YH3 nanoparticles partly decompose to YH2 at 300 °C in vacuum and Mg–Mg2Cu-YHx nanocomposites are in-situ formed. The nano-sized YH2 helps catalyze H2 dissociation and the YHx/Mg interfaces stimulate H diffusion and the nucleation of MgH2. Therefore, the Mg93Cu5Y2 composite shows the fastest absorption rates. However, due to the positive effect of YHx/Mg interfaces on H diffusion and the negative effect of YH3 nanophases on the hydride decomposition, the minimum activation energy of 115.43 kJ mol−1 is obtained for the desorption of the Mg93Cu5.67Y1.33 hydride." @default.
• W2955763603 created "2019-07-12" @default.
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• W2955763603 date "2019-08-01" @default.
• W2955763603 modified "2023-09-26" @default.
• W2955763603 title "In-situ hydrogen-induced evolution and de-/hydrogenation behaviors of the Mg93Cu7-Y alloys with equalized LPSO and eutectic structure" @default.
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• W2955763603 doi "https://doi.org/10.1016/j.ijhydene.2019.06.089" @default.
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