Solonin Y.M., Dobrovolsky V.D., Ershova O.G., Khyzhun O.Yu.

Frantsevich Institute of Problems of Materials Science National Academy of Sciences of Ukraine, 3, Krzhyzhanovsky str., Kyiv, Ukraine

The significant aggravation of energy and especially environmental problems, which is observed both in Ukraine and throughout the world, the exhaustion of traditional fossil hydrocarbon fuels put forward the problem of a wider use of alternative energy carriers and, first of all, hydrogen. Hydrogen is a unique energy carrier that has three times the energy intensity compared to traditional fuels, it is easy to store and transport, it can be very effectively converted into electricity, for example, in fuel cells, with the only waste being water.

Clean energy technologies that use hydrogen as energy carrier can be harmoniously combined with systems based on renewable energy sources, primarily solar, wind, geothermal, etc. One of the shortcomings of these sources is the periodicity of their action. Therefore, the issue of accumulation of residual energy and its further utilization becomes topical. The use of hydrogen as a battery of energy in this case is considered the most promising. Hydrogen is conveniently stored in the solid compounds - metal hydrides. In recent years, the focus is on hydrogen storage devices based on magnesium.

The presented report contains an overview of the results of studies carried out in recent years at the IPMS NAS of Ukraine. The aim of the research was to decrease the temperature and improve the kinetics of the decomposition of the stoichiometric hydride MgH₂ using the mechanical dispersion and doping of Ti, Fe, Ni, and Al in the course of its synthesis. The role of separately each of these alloying elements as well as the role of double doping of Al + Ti, Al + Fe, Al + Ni, Ti + Fe in reducing the temperature and improving the kinetics of the decomposition of the hydride phase of MgH₂ mechanical alloys obtained by the method of reactive mechanical alloying .