Hydrogen storage by spillover on Ni4 cluster embedded in three vacancy graphene. A DFT and dynamics study

被引：9
作者：
Ambrusi R.E. [1 ,3 ]
Orazi V. [1 ,2 ]
Marchetti J.M. [4 ]
Juan A. [1 ,3 ]
Pronsato M.E. [1 ,3 ]
机构：
[1] Instituto de Física del Sur (IFISUR), CONICET, Av. L. N. Alem 1253, Bahía Blanca
[2] Departamento de Ingeniería Eléctrica y Computadoras, Universidad Nacional del Sur (UNS), Av. L. N. Alem 1253, Bahía Blanca
[3] Departamento de Física, Universidad Nacional del Sur (UNS), Av. L. N. Alem 1253, Bahía Blanca
[4] Faculty of Science and Technology, Norwegian University of Life Sciences, Drøbakveien 31, Ås
来源：
Journal of Physics and Chemistry of Solids | 2022年 / 167卷
关键词：
AIMD; Graphene; Hydrogen storage; Ni cluster; Vacancy defects;
D O I：
10.1016/j.jpcs.2022.110706
中图分类号：
学科分类号：
摘要：
An ab initio dynamics study was performed with the aim of understanding better the hydrogen adsorption mechanism, stability and capacity with the temperature on Ni4 cluster embedded in a three vacancy graphene substrate. Additionally, the hydrogen migration to the substrate was analyzed observing an outstanding improvement for the activation energy compared with the systems without vacancies. Moreover, a suitable reduction in the hydrogen migration energy barriers was achieved with the subsequent hydrogen adsorption of more molecules on the cluster. Consequently, in the light of these new insights hydrogen spillover on Ni4 can be highly influenced by both, vacancy defects and the saturation with hydrogen molecules. © 2022 Elsevier Ltd
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