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CHARACTERIZATION AND INVESTIGATION OF HYDROGEN STORAGE PROPERTIES OF 80 WT. % MGH2 - 15 WT.%NI - 5 WT. % POW

E. Grigorova

Abstract

Magnesium-based materials are very attractive as hydrogen storage media, due to their high hydrogen absorption capacity (theoretically, 7.6 wt.% H2) and low price. Some drawbacks of these materials, like slow hydrogen sorption kinetics and high absorption-desorption temperatures, can be overcome using different additives and high energy ball milling. In this study, the hydrogen sorption characteristics of the Mg-Ni-C composites, prepared by ball milling under Ar atmosphere, are investigated. Polyolefin wax (POW, a waste product of polyethylene production at low pressure) was submitted to pyrolysis and steam activation, in order to prepare nanoporous carbon CPOW, which is further used as additive in the preparation of MgH2-Ni composite. Structure, phase and surface composition of the starting compounds, and the sample before and after hydriding are determined by XRD and TEM. The maximum absorption capacity achieved for composite containing ACPOW, after 60 min of hydriding at 573 K, is 5.3 wt. %. The presence of the additives - Ni and nanoporous carbon - has positive influence on both hydrogenation kinetics and the capacity achieved. The results from TEM characterization show the presence of graphite, Mg and monoclinic Mg2NiH4.

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DOI resolver: doi.org/10.5593/sgem2019/4.1/s17.010

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