Nanostructured Metal Hydrides for Hydrogen Storage Studied by IN Situ Synchrotron and Neutron Diffraction
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etal Hydrides for Hydrogen Storage Studied by In Situ Synchrotron and Neutron Diffraction Volodymyr Yartys, Roman Denys, Jan Petter Maehlen, Colin J Webb, Evan MacA Gray, Tomas Blach, Andrey A. Poletaev, Jan Ketil Solberg and Olivier Isnard MRS Proceedings / Volume 1262 / 2010 DOI: 10.1557/PROC1262W0401
Link to this article: http://journals.cambridge.org/abstract_S1946427400004590 How to cite this article: Volodymyr Yartys, Roman Denys, Jan Petter Maehlen, Colin J Webb, Evan MacA Gray, Tomas Blach, Andrey A. Poletaev, Jan Ketil Solberg and Olivier Isnard (2010). Nanostructured Metal Hydrides for Hydrogen Storage Studied by In Situ Synchrotron and Neutron Diffraction. MRS Proceedings,1262, 1262W0401 doi:10.1557/PROC1262W0401 Request Permissions : Click here
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Mater. Res. Soc. Symp. Proc. Vol. 1262 © 2010 Materials Research Society
1262-W04-01
Nanostructured Metal Hydrides for Hydrogen Storage Studied by In Situ Synchrotron and Neutron Diffraction V. A. Yartys1,2, R.V. Denys1, J.P. Maehlen1, C.J. Webb3, E. MacA. Gray3, T. Blach3, A.A. Poletaev1,2, J.K. Solberg2, and O. Isnard4 1
2
Institute for Energy Technology, P.O.Box 40, Kjeller, NO-2027, NORWAY Norwegian University of Science and Technology, Trondheim, NO-7491, NORWAY 3 Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan 4111, AUSTRALIA 4 Institute Néel, CNRS/UJF, 38042 Grenoble, FRANCE
ABSTRACT This work was focused on studies of the metal hydride materials having a potential in building hydrogen storage systems with high gravimetric and volumetric efficiencies of H storage and formed / decomposed with high rates of hydrogen exchange. In situ diffraction studies of the metal-hydrogen systems were explored as a valuable tool in probing both the mechanism of the phase-structural transformations and their kinetics. Two complementary techniques, namely Neutron Powder Diffraction (NPD) and Synchrotron X-ray diffraction (SR XRD) were utilised. High pressure in situ NPD studies were performed at D2 pressures reaching 1000 bar at the D1B diffractometer accommodated at Institute Laue Langevin, Grenoble. The data of the time resolved in situ SR XRD were collected at the Swiss Norwegian Beam Lines, ESRF, Grenoble in the pressure range up to 50 bar H2 at temperatures 20-400°C. The systems studied by NPD at high pressures included deuterated Al-modified Lavestype C15 ZrFe2-xAlx intermetallics with x = 0.02; 0.04 and 0.20 and the CeNi5-D2 system. D content, hysteresis of H uptake and release, unit cell expansion and stability of the hydrides systematically change with Al content. Deuteration exhibited a very fast kinetics; it resulted in increase of the unit cells volumes reaching 23.5 % for ZrFe1.98Al0.02D2.9(1) and associated with exclusive occupancy of the Zr2(Fe,Al)2 tetrahedra. For CeNi5 deuteration yielded a hexahydride CeNi5D6.2 (20°C, 776 bar D2) and was accompanied by a nearly isotropic volume expansion reaching 30.1% (∆a/a=10.0%; ∆c/c=7
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