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Development of a Hydrogen-Storage Alloy with a High Capacity of Approximately 6 wt% by Adding a Transition Metal and a Halide

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A sample with a composition of 80 wt% Mg + 14 wt% Ni + 6 wt% TaF5 (designated 80Mg + 14Ni + 6TaF5) was prepared by reactive mechanical grinding. The hydrogenation and dehydrogenation properties of the sample were then examined and we analyzed a rate-determining step for the dehydrogenation of the activated 80Mg + 14Ni + 6TaF5 using a spherical moving-boundary model. Two cycles of hydrogenation in 12 bar H2 and dehydrogenation in a vacuum were required for activation. At the third cycle at 593 K, the sample absorbed 4.86 wt% H for 5 min and 5.77 wt% H for 60 min in 12 bar H2 and released 5.04 wt% H for 30 min and 5.21 wt% H for 60 min in 1.0 bar H2. The activated 80Mg + 14Ni + 6TaF5 had quite high hydrogenation and dehydrogenation rates and a large hydrogen-storage capacity with an effective hydrogen-storage capacity of approximately 6 wt%. The Ni and halide (TaF5)-added Mg sample had a higher initial hydrogenation rate and a larger hydrogen-storage capacity than an Ni and oxide (Fe2O3)-added Mg sample.
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Keywords: Hydrogen Absorbing Materials; Mechanical Milling; Nickel and Tantalum Fluoride Addition; Scanning Electron Microscopy (SEM); X-ray Diffraction

Document Type: Research Article

Affiliations: 1: Department of Materials Engineering, Graduate School, Chonbuk National University, 567 Baekje-daero Deokjin-gu Jeonju, 54896, South Korea 2: School of Chemical Engineering, Chonnam National University, 300 Yongbong-dong Buk-gu Gwangju, 61186, South Korea 3: Division of Advanced Materials Engineering, Hydrogen and Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, 567 Baekje-daero Deokjin-gu Jeonju, 54896, 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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