Improvement in the hydrogen-storage properties of Mg by the addition of metallic elements Ni, Fe, and Ti, and an oxide Fe2O3 |
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| Authors: | Myoung Youp Song Young Jun Kwak Hye Ryoung Park Daniel R. Mumm |
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| Affiliation: | aDivision of Advanced Materials Engineering, Department of Hydrogen and Fuel Cells, Research Center of Advanced Materials Development, Engineering Research Institute, Chonbuk National University, 664-14 Deokjin-Dong 1Ga Deokjin-Gu Jeonju Jeonbuk 561-756, South Korea;bDepartment of Materials Engineering, Graduate School, Chonbuk National University, 664-14 Deokjin-Dong 1Ga Deokjin-Gu Jeonju Jeonbuk 561-756, South Korea;cFaculty of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-Dong Buk-Gu, Gwangju 500-757, South Korea;dDepartment of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697-2575, USA |
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| Abstract: | Pure Mg was employed as a starting material instead of MgH2 in this work. The magnesium prepared by mechanical grinding under H2 (reactive mechanical grinding) with transition elements or oxides showed relatively high hydriding and dehydriding rates when the content of additives was about 20 wt.%. Ni, Fe and Ti were chosen as metallic transition elements to be added. Fe2O3 was selected as an oxide to be added. Samples Mg–14Ni–2Fe2O3–2Ti–2Fe were prepared by reactive mechanical grinding, and their hydrogen storage properties were examined and compared with those of a pure Mg sample prepared by reactive mechanical grinding under the same conditions. The Mg–14Ni–2Fe2O3–2Ti–2Fe sample showed much better hydrogen storage properties than the pure Mg sample. The as-milled Mg–14Ni–2Fe2O3–2Ti–2Fe sample did not require the activation. This sample absorbs 4.26 wt.% H for 5 min, and 4.41 wt.% H for 10 min, and 4.56 wt.% H for 60 min at n = 2. It desorbs 1.13 wt.% H for 10 min, 2.67 wt.% H for 30 min, and 3.32 wt.% H for 60 min at n = 2. |
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| Keywords: | A. Hydrides C. X-ray diffraction D. Microstructure D. Phase transitions |
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