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Abstract
Magnesium-based materials are promising as hydrogen storage media due to their high theoretical hydrogen absorption capacity, abundance and low price. The subject of this study are the hydrogen sorption characteristics of the composites 80 wt % MgH2-15 wt % Ni-5 wt % activated carbon (synthesized from polyolefin wax, a waste product of polyethylene production at low pressure which will be denoted further in the text as POW) and 90 wt % MgH2-5 wt % Ni-5 wt % POW, prepared by ball milling under argon atmosphere. Structure, phase and surface composition of the samples before and after hydrogenation are determined by XRD and TEM. The maximum absorption capacity value of the composites at a temperature 573 K and after 60 min. of hydrogenation are 5.3 wt % H2 for the material with higher Ni content and 5.5 wt % H2 for the other sample. The presence of both additives—nickel and activated carbon derived from POW—has a positive impact on hydrogenation kinetics and the capacity achieved. The results from TEM characterization, e.g., the polycrystalline SAED (selected area electron diffraction) show the presence of graphite, Mg and monoclinic Mg2NiH4.
Highlights
Hydrogen is a renewable and clean energy carrier that can store or deliver a tremendous amount of energy
One of the promising candidates for hydrogen storage applications is magnesium. Materials based on this lightweight metal have potential as hydrogen storage media due to their high theoretical hydrogen absorption capacity, abundance and low price
To overcome some hindrances of these materials, like slow hydrogen sorption kinetics and high absorption-desorption temperatures, various additives combined with high energy ball milling are used [1,2,3]
Summary
Hydrogen is a renewable and clean energy carrier that can store or deliver a tremendous amount of energy. One of the key problems related with its widespread use is its storage. Finding a solution for the hydrogen storage problem is considered to be the foremost challenge for the hydrogen economy. One of the promising candidates for hydrogen storage applications is magnesium. Materials based on this lightweight metal have potential as hydrogen storage media due to their high theoretical hydrogen absorption capacity, abundance and low price. The recently published review by Yartys et al [3] is focused on the research field of magnesium-based materials for hydrogen energy storage with topics of fundamental and applied studies and a review of the frontiers of both experimental and theoretical research, including nanostructuring, kinetics, thermodynamics and catalysis of magnesium and the hydrides. This review clearly states that Mg-based materials are very attractive for variety of energy applications
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