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New hydrogen storage materials at the border between the metallic and insulating state

English title New hydrogen storage materials at the border between the metallic and insulating state
Applicant Yvon Klaus
Number 116086
Funding scheme Project funding (Div. I-III)
Research institution Laboratoire de Cristallographie Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Condensed Matter Physics
Start/End 01.04.2007 - 31.07.2009
Approved amount 263'772.00
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Keywords (9)

hydrogen storage; metal hydrides; metal-hydrogen interactions; magnetism; metal-insulator transitions; neutron powder diffraction; metal-insulator transition; PEM fuel cell; metal-hydrogen interaction

Lay Summary (English)

Lead
Lay summary
The project aims at the synthesis of new transition metal hydrides in systems that show hydrogenation induced metal insulator transitions. Such compounds have intrinsically high hydrogen concentrations and thus the potential of being useful for hydrogen storage applications such as PEM fuel cells systems (target : hydrogen dissociation temperatures of less than 80°C at 1.5 bar pressure, and hydrogen/metal weight ratios of more than 5 wt.%). The metal-insulator transitions make them useful for hydrogen detectors. The localization of the conduction electrons into metal-hydrogen bonds is achieved by the application of suitable temperature-pressure conditions that allow the formation of covalently bonded T metal hydrogen complexes such as in the NiH4 complexes in La2MgNi2-H, LaMg2Ni-H and LaMg2Pd-H systems. In systems where this cannot be achieved, a local formation of such complexes is that is expected to correlate with the hydrogen equilibrium pressure. Their study allows one to understand better the transition metal - hydrogen interactions and in particular enthalpies of hydride formation.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
107727 Experimental and theoretical studies of metal-hydrogen interactions in solid-state metal hydrides 01.04.2005 Project funding (Div. I-III)

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