Dissociation of H2 on Mg-coated B12C6N6

doi:10.1088/1674-1056/26/6/068801

Abstract The dissociation of H₂ molecule is the first step for chemical storage of hydrogen, and the energy barrier of the dissociation is the key factor to determine the kinetics of the regeneration of the storage material. In this paper, we investigate the hydrogen adsorption and dissociation on Mg-coated B₁₂C₆N₆. The B₁₂C₆N₆ is an electron deficient fullerene, and Mg atoms can be strongly bound to this cage by donating their valance electrons to the virtual 2p orbitals of carbon in the cluster. The preferred binding sites for Mg atoms are the B₂C₂ tetragonal rings. The positive charge quantity on the Mg atom is 1.50 when a single Mg atom is coated on a B₂C₂ ring. The stable dissociation products are determined and the dissociation processes are traced. Strong orbital interaction between the hydrogen and the cluster occurs in the process of dissociation, and H₂ molecule can be easily dissociated. We present four dissociation paths, and the lowest energy barrier is only 0.11 eV, which means that the dissociation can take place at ambient temperature.

Keywords: Mg-coated B₁₂C₆N₆ H₂ dissociation energy barrier

Received: 17 January 2017
Revised: 25 March 2017
Accepted manuscript online:

PACS:	88.30.R-	(Hydrogen storage)
	36.40.-c	(Atomic and molecular clusters)
	31.15.A-	(Ab initio calculations)
	33.15.Fm	(Bond strengths, dissociation energies)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11164024 and 11164034).

Corresponding Authors: Hong-Shan Chen
E-mail: chenhs@nwnu.edu.cn

Cite this article:

Li Ma(马丽), Xue-Ling Jin(金雪玲), Hui-Hui Yang(杨慧慧), Xiao-Xia Wang(王小霞), Ning Du(杜宁), Hong-Shan Chen(陈宏善) Dissociation of H₂ on Mg-coated B₁₂C₆N₆ 2017 Chin. Phys. B 26 068801

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Dissociation of H2 on Mg-coated B12C6N6

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Dissociation of H₂ on Mg-coated B₁₂C₆N₆