The Effects of Mechanical Milling and Nb-Based Additives on the Kinetics Sorption Properties of 2LiBH4-MgH2

Marwan, Farhanah (Institut Teknologi Sepuluh Nopember, Surabaya)
Janot, Raphaël (Laboratoire de Réactivité et Chimie des Solide, CNRS, Amiens, France)
Chotard, Jean-Noël (Laboratoire de Réactivité et Chimie des Solide, CNRS, Amiens, France)

IPTEK Journal of Proceedings Series
No 1 (2015): 1st International Seminar on Science and Technology (ISST) 2015

In this work, the effects of ball milling with different catalysts (including NbF5 and Nb2O5) on the hydrogen storage properties of 2LiBH4-MgH2 system were investigated. The increase of ball-milling time (from 5 min to 24 h) can reduce the crystallites size of MgH2 from 74 nm to 14 nm and decrease the dehydrogenation temperature of MgH2 from 390°C to 345°C. Among Nb-based catalysts, sample with NbF5 shows slightly better sorption kinetics than the one with Nb2O5, it can store reversibly about 9 wt.% of H2 in 24 h at 350°C, whereas more than 60 h are needed with Nb2O5 . This indicates that NbF5 is superior to Nb2O5 for improving the sorption kinetics of 2LiBH4-MgH2 system.