Improvement of hydrogen-storage properties of MgH2 by addition of Ni and Ti via reactive mechanical grinding and a rate-controlling step in its dehydriding reaction |
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Authors: | Myoung Youp Song Young Jun Kwak Seong Ho Lee Hye Ryoung Park Byoung-Goan Kim |
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Affiliation: | 14033. Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, 567 Baekje-daero Deokjin-gu, Jeonju, 561-756, Korea 24033. Department of Materials Engineering, Graduate School, Chonbuk National University, 567 Baekje-daero Deokjin-gu, Jeonju, 561-756, Korea 34033. School of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong Buk-gu, Gwangju, 500-757, Korea 44033. Korea Energy Materials Ltd., 409 Daegu Technopark, 1-11 Hosan-dong Dalseo-gu, Daegu, 704-230, Korea
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Abstract: | In a shift from prior work, MgH2, instead of Mg, was used as a starting material in this work. A sample with a composition of 86 wt% MgH2-10 wt% Ni-4 wt% Ti was prepared by reactive mechanical grinding. Activation of the sample was completed after the first hydriding cycle. The effects of reactive mechanical grinding of Mg with Ni and Ti were discussed. The formation of Mg2Ni increased the hydriding and dehydriding rates of the sample. The addition of Ti increased the hydriding rate and greatly increased the dehydriding rate of the sample. The titanium hydride, TiH1.924, was formed during reactive mechanical grinding. This titanium hydride, which is brittle, is thought to help the mixture pulverized by being pulverized during reactive mechanical grinding and further to prevent agglomeration of the magnesium by staying as a hydride among Mg particles. A rate-controlling step for the dehydriding reaction of the hydrided MgH2-10Ni-4Ti was analyzed by using a spherical moving boundary model on an assumption that particles have a spherical shape with a uniform diameter. |
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