Abstract
Finite fossil-fuel supplies, nuclear waste and global warming linked to CO2 emissions have made the development of alternative/‘green’ methods of energy production, conversion and storage popular topics in today’s energy-conscious society. These crucial environmental issues, together with the rapid advance and eagerness from the electric automotive industry have combined to make the development of radically improved energy storage systems a worldwide imperative. CuMg2 has an orthorhombic crystal structure and does not form a hydride: it reacts reversibly with hydrogen to produce Cu2Mg and MgH2. However, CuLi x Mg2−x (x = 0.08) has a hexagonal crystal structure, just like NiMg2, a compound known for its hydrogen storage properties. NiMg2 absorbs up to 3.6 wt% of H. Our studies showed that not only CuLi x Mg2−x absorbs a considerable amount of hydrogen, but also starts releasing it at a temperature in the range of 40–130 °C. In order to determine the properties of the hydrogenated CuLi x Mg2−x , absorption–desorption, Differential scanning calorimeter and thermo-gravimetric experiments were performed. Neutron spectra were collected to elucidate the behavior of hydrogen in the Li-doped CuMg2 intermetallic. Using DFT calculations we were able to determine the best value for x in CuLi x Mg2−x and compare different possible structures for the CuLi x Mg2−x hydride.
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Acknowledgements
The authors would like to acknowledge Portuguese Science Foundation, FCT, for the project (PTDC/CTM/099461/2008 and FCOMP-01-0124-FEDER-009369). This work has benefited from the use of neutron scattering instrument FDS at the Lujan Center at Los Alamos Neutron Science Center, funded by DOE Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE-AC52-06NA25396.
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Braga, M.H., Ferreira, J.A. & Wolverton, M.J. Study of the Cu–Li–Mg–H system by thermal analysis. J Therm Anal Calorim 108, 733–739 (2012). https://doi.org/10.1007/s10973-011-2126-0
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DOI: https://doi.org/10.1007/s10973-011-2126-0