Improvement effect of reversible solid solutions Mg2 Ni(Cu)/ Mg2 Ni(Cu)H4 on hydrogen storage performance of MgH2

The hydrogen absorption/desorption kinetic properties of MgH2 can be effectively enhanced by doping specific catalysts. In this work, MOFs-derived NiCu@C nanoparticles ( -15 nm) with regular core -shell structure were successfully prepared and introduced into MgH2 (denoted as MgH2-NiCu@C). The onset and peak temperatures of hydrogen desorption of MgH2 -11 wt.% NiCu@C are 175.0 degrees C and 282.2 degrees C, respectively. The apparent activation energy of dehydrogenated reaction is 77.2 +/- 4.5 kJ/mol for MgH2 -11 wt.% NiCu@C, which is lower than half of that of the as -milled MgH2. Moreover, MgH2 -11 wt.% NiCu@C displays great cyclic stability. The strengthening "hydrogen pumping" effect of reversible solid solutions Mg2Ni(Cu)/Mg2Ni(Cu)H4 is proposed to explain the remarkable improvement in hydrogen absorption/desorption kinetic properties of MgH2. This work offers a novel perspective for the design of bimetallic nanoparticles and beyond for application in hydrogen storage and other energy related fields. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY -NC -ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University