Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia (Bulgaria)
Friday September 8, 2023 - 2:00 p.m.
University of Rennes – Beaulieu Campus
1st floor, room 160
Solid State Chemistry and Materials team
Some mixtures with composition MgH2 – 5, 10 or 15 wt. % of Ni or V- 5 wt. % of carbon additives derived from different waste materials with high specific surface area and developed pore structure are tested as hydrogen storage media. For the best effect on the hydrogen sorption kinetics in the MgH2-Ni (V)- activated carbon at least 10 wt. % of Ni and 5 wt. % of carbon additive with higher specific surface area and more developed pore structure should be used. Facilitated synthesis method of Mg2NiH4 is also developed and materials with fast hydrogen sorption kinetics and relatively high absorption capacity are obtained. Some of the received samples are tested as anode in NiMH battery and the Mg2Ni0.7V0.3 showed very good discharge capacity of 400 mAh/g, but only at first cycle and very fast corrosion appeared during electrochemical cycling. The hydrogen storage properties of the multicomponent alloys with composition Mg50Ni12.5Al12.5V12.5Fe12.5 and Mg50Ni12.5Al12.5V12.5Ti12.5 obtained by ball milling for 50h and 100h under argon are investigated. Their hydrogen storage capacity is due mainly to Mg and at 3000C is around 2 wt. %, but they showed fast absorption kinetics and in 2 min. reach more than 65% of their maximal capacity.
Contact: Mathieu Pasturel (3 58 61) - mathieu [dot] pastureluniv-rennes [dot] fr