▎ 摘　　要

The present investigation deals with the excellent catalytic effect of graphene templated Ti -Ni-Fe nanoparticles (TieNieFe@Gr) on de/re-hydrogenation characteristics of MgH2. The catalytic effect of TieNieFe@Gr on MgH2 has also been compared with Ti@Gr, Ni@Gr, and Fe@Gr. It has been found that Ti-Ni-Fe@Gr lowers the onset desorption temperature up to 252 degrees C with improved kinetics and cyclability for the hydrogen release and absorption from MgH2. The presence of a multivalence environment around Mg/MgH2 has been analyzed by XPS analysis which gives the evidence of possible electronic exchange between the catalyst and Mg/MgH2 during de-/rehydrogenation. Since Mg/MgH2 and TieNieFe are both anchored on graphene template, agglomeration detrimental to cycling is not possible. Thus negligible degradation of 0.22 wt% has been observed even after 24 cycles of de/rehydrogenation. (C) 2022 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.