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- W2892005125 abstract "To illuminate the effects of eutectic structure on the de-/hydrogenation properties of Mg-based alloy, Mg-9Ni, Mg-12Cu and Mg-6Ni-3Cu (at. %) alloys with nearly the same primary Mg proportion are prepared. Mg2Ni and Mg2Cu respectively form a eutectic structure with Mg and tunable eutectic is obtained via Cu partial substituting Ni. Mg-6Ni-3Cu alloy shows excellent activation performance and rapid absorption rates without any sacrifice of desorption rates, leading to a maximum hydrogen capacity of 6.5 wt% H2 under 300 °C 3 MPa. Different from the independent de-/hydriding behavior of Mg->12Cu alloy, Mg-6Ni-3Cu alloy shows perfectly wide pressure-composition-isotherm plateau with minimal slope. The dehydrogenation models of experimental hydrides are determined. Owing to Cu substitution, the dehydrogenation activation energy reduces from 95.82 to 67.34 kJ mol−1 H2, the onset/peak desorption temperature also reduces significantly. It is the spatial connected eutectic and its increased boundaries that facilitate the activation and H diffusion process, which greatly compensate the negative impacts of reduced hydrogenation driving force caused by Mg2Cu. The rapid H diffusion coupled with the increased dehydrogenation driving force collectively facilitates its dehydriding process." @default.
- W2892005125 created "2018-09-27" @default.
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- W2892005125 date "2018-10-01" @default.
- W2892005125 modified "2023-10-18" @default.
- W2892005125 title "Tunable eutectic structure and de-/hydrogenation behavior via Cu substitution in Mg-Ni alloy" @default.
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- W2892005125 doi "https://doi.org/10.1016/j.jpowsour.2018.08.086" @default.
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