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Cycling Performance of NaAlH4 and Transition Metals-Added MgH2 Prepared via Milling in a Hydrogen Atmosphere

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MgH2 was used as a starting material instead of Mg in this work. A sample with a composition of 86 wt% MgH2–10 wt% Ni–2 wt% NaAlH4–2 wt% Ti (named MgH2–10Ni–2NaAlH4–2Ti) was prepared by reactive mechanical grinding. Its hydriding–dehydriding cycling performance measurement, X-ray diffraction (XRD) analysis, and microstructure observation were then performed. The activation of the sample was completed after three hydriding (under 12 bar H2)–dehydriding (in vacuum) cycles. At n = 20 at 593 K under 12 bar H2, the sample absorbed 3.37 wt% H for 5 min, 3.52 wt% H for 10 min, and 3.57 wt% H for 30 min. The maintainability of absorbed hydrogen quantity, Ha, at n = 20 was 95.7% at the reaction time of 30 min, compared with Ha at n = 4. As the number of cycles increased from n = 4 to n = 20 at 593 K under 12 bar H2, the hydrogen quantity, Ha, absorbed for 2.5 min increased whereas the Ha values at the reaction times of 5, 10 and 30 min decreased.
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Keywords: Cycling; Hydriding Rate; NaAlH4; Ni and Ti Addition; Reactive Mechanical Grinding; Starting Material MgH2

Document Type: Research Article

Affiliations: 1: Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, Engineering Research Institute, Chonbuk National University, 567 Baekje-daero Deokjin-gu Jeonju, 54896, South Korea 2: Department of Materials Engineering, Graduate School, Chonbuk National University, 567 Baekje-daero Deokjin-gu Jeonju, 54896, South Korea 3: School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro Buk-gu Gwangju, 61186, South Korea

Publication date: 01 November 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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