Citation: LI Yuan-Yuan, ZHAO Xin-Xin, MI Yi-Ming, SUN Gai-Li, WU Jian-Bao, WANG Li-Li. Effect of Y on the Properties of Graphene for Hydrogen Storage[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1658-1665. doi: 10.3866/PKU.WHXB201604111 shu

Effect of Y on the Properties of Graphene for Hydrogen Storage

1.
School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, P. R. China;
2.
School of Fundamental Studies, Shanghai University of Engineering Science, Shanghai 201620, P. R. China

Received Date: 14 January 2016
Revised Date: 8 April 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (11504228), Academic Degree Construction Program of Shanghai Municipal Education Commission, China (14XKCZ13), Innovation Program of Shanghai Municipal Education Commission, China (10YZ172), and Shanghai University of Engineering Science Innovation Fund for Graduate Students, China (E1-0903-14-01107-14KY0411).

The first-principles plane-wave pseudopotential method within density functional theory formalism is used to investigate the effect of Y atom decoration of graphene on the properties for hydrogen storage. The clustering problem for the Y atoms decorated on graphene is considered, and substitutional boron doping is shown to effectively prevent the clustering of Y atoms on graphene. The geometrical configuration of the modified system is stable and the adsorption properties of H₂ are excellent, which can adsorb up to 6 H₂ molecules with an average adsorption energy range of -0.539 to -0.655 eV (per H₂), as determined by theoretical analyses. This satisfies the theoretical ideal range for hydrogen storage. Moreover, based on the calculation and analysis of the Bader charge, the electronic density of states and the charge density difference of the H₂/Y/B/graphene (G) system, it is proved that the Y atom exhibits bonding with graphene by charge transfer and interacts with hydrogen molecules through typical Kubas interactions. The existence of the Y atomalters the charge distribution of the H₂ molecules and graphene sheet. Hence, the Y atom becomes a bridge linking the H₂ molecules and graphene sheet. Thereby, the adsorption energies of the H₂ molecule are adjusted to the reasonable region. The modified system exhibits excellent potential as one of the most suitable candidates for a hydrogen storage medium in the molecular state at near ambient conditions.
- Graphene,
- Y decoration,
- H₂ molecule adsorption,
- First-principles,
- B doping
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