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Registration Number

0220U102652, 0118U005405 , R & D reports

Title

MXenes – two-dimensional carbides, carbonitrides, nitrides and intermetallics: their catalytic properties and application in hydrogen energy technologies

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Head

Korablov Dmytro S., Доктор філософії

Registration Date

23-04-2020

Organization

Institute for Problems in Materials Science

Description

The synthesis methods of MXenes and the synthesis of Ti3C2 MXene by 'up-to-down' approach were studied. The most optimal synthesis method in terms of safety, efficiency, and equipment simplicity using solutions of hydrochloric acid and fluorides of alkali metals is proposed. Magnesium-based composites with the addition of MAX phases and titanium nanoparticles were synthesized, which is followed by studying their thermodynamic characteristics. The thermal hydrogen desorption and re-sorption properties of these composite materials were investigated. The decomposition temperature of MgH2-based nanocomposites is ca. 150 °C lower than that of polycrystalline MgH2 (~ 400 °C), indicating a positive effect of nanostructuring (mechanochemical activation of the material in hydrogen) and the catalytic effect of the corresponding additives on the decomposition of MgH2. A number of new AB3 type intermetallics were synthesized in REE-Mg-Ni-(Co, In, Ga) systems and their hydrogen sorption-desorption properties were investigated. The electrochemical hydrogenation of the synthesized intermetallics was performed. The new magnesium-containing alloys (REE-Mg-Ni-Co-Al/Ga/In) were prepared by sintering of Mg powder and arc-melted intermetallic compounds at 450 °C for 8 hours in Ar atmosphere. The REE3-xMgxCo9 compounds crystallize in the PuNi3 structural type and are isostructural to the already known La3-xMgxNi9 phases. The investigated charge-discharge characteristics demonstrated the need to continue the ongoing studies to obtain effective electrode materials for Ni-MH rechargeable batteries. 

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Bezdorozhev Oleksiy V.
Berezovets Vasyl V
Lyutyy Pavlo Ya
Petrash Kostyantyn M