Abstract
The Mg17Ni1.5Ce0.5 hydrogen storage composites with different contents of graphite were prepared by a new method of mechanical milling and subsequent microwave sintering. The small particle size (~25 μm) and the low echo ratio of power indicate that graphite plays an important role not only as a lubricant during mechanical milling but also as a supplementary heating material during microwave sintering. As a catalyst in the hydriding/dehydriding (H/D) reaction, graphite also improved the hydrogen storage properties of the composites. The hydrogen absorption and desorption capacities of Mg17Ni1.5Ce0.5 with 5 wt pct graphite were 5.34 and 5.30 wt pct H2 at 573 K (300 °C), its onset temperature of dehydriding reaction was 511 K (238 °C), and its activation energies of H/D reaction were 40.9 and 54.5 kJ/mol H2, respectively. The kinetic mechanisms of the H/D reaction are also discussed.
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Acknowledgments
The authors thank the staff at the Instrumental Analysis and Research Center (Shanghai University) for their support of the materials testing and research. This work was financially sponsored by the Shanghai Rising-Star Program (Grant No. 11QH1400900), and QL is currently supported, in part, by an appointment of the United States Department of Energy Higher Education Research Experience Program at Oak Ridge National Laboratory, administered by the Oak Ridge Institute for Science and Education.
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Manuscript submitted March 25, 2012.
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Meng, J., Wang, XL., Chou, KC. et al. Hydrogen Storage Properties of Graphite-Modified Mg-Ni-Ce Composites Prepared by Mechanical Milling Followed by Microwave Sintering. Metall Mater Trans A 44, 58–67 (2013). https://doi.org/10.1007/s11661-012-1301-7
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DOI: https://doi.org/10.1007/s11661-012-1301-7