First-principles hydrogen adsorption properties of Li-decorated ThMoB4-type graphene

• Published in: International journal of hydrogen energy Vol. 43; no. 33; pp. 16117 - 16127
• Main Authors: Alp, Irem O., Aydin, Sezgin, Ciftci, Yasemin O.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 16.08.2018
• Subjects: Adsorption; Graphene; Hydrogen storage; ThMoB4-type; Hydrogen storage; Adsorption; Graphene; ThMoB4-type
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2018.07.052

The hydrogen storage (1–10H2) properties of single- and double-side lithium decorated ThMoB4-type graphene (Li/ThMoB4C) are systematically investigated by density functional first-principles calculations within Dmol3 package. After well-converged geometry optimizations, it is found that the binding energy of Li adatom is higher enough, and there is no adatom clustering. The average adsorption energies of 1–6 H2 deviate in 0.20–0.27 eV/H2 range, which is providing a convenient physical adsorption-desorption cycle. A detailed examination of the binding mechanism between the constituents of the H2 adsorbed Li-decorated systems is presented by density of states, Mulliken charge analysis, electron density and density difference calculations. For further decoration and adsorption with 12Li adatom and 72H2 molecules, the computation yields a high gravimetric density of 14.5 wt % with the acceptable adsorption energy. In this way, it is concluded that Li/ThMoB4 system can be considered as a promising hydrogen storage medium. •These systems can capture H2 with the adsorption energies of 0.200–0.273 eV/H2.•Adsorption process of H2 molecules is realized by polarization mechanism.•The gravimetric density for 72 H2 adsorbed system is calculated as 14.5 wt %.•Li/ThMoB4C system can serve as a promising medium for hydrogen storage.