Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2842.doi: 10.7503/cjcu20210354

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Investigation of Hydrogen Storage Properties of Sc, Ti, V-decorated and B/N-doped Monovacancy Graphene

MA Lijuan(), GAO Shengqi, RONG Yifei, JIA Jianfeng, WU Haishun   

  1. Key Laboratory of Magnetic Molecules & Magnetic Information Materials,Ministry of Education,School of Chemical and Material Science,Shanxi Normal University,Linfen 041004,China
  • Received:2021-05-21 Online:2021-09-10 Published:2021-09-08
  • Contact: MA Lijuan E-mail:malijuan19852223@163.com
  • Supported by:
    the National Natural Science Foundation of China(21805176);the Natural Science Foundation for Young Scientists of Shanxi Province, China(201901D211394);the Shanxi Province Postgraduate Innovation Project, China(2020SY332);the Innovation Project of Shanxi Normal University, China(2020XSY030)

Abstract:

3d Transition-metal decorating is the most effective way to improve the hydrogen storage performance of graphene. However, metal agglomeration and dissociation of H2 greatly limit their application. In this paper, B/N doping was proposed to avoid the above two problems. Density functional theory calculations show that the binding energy of Sc can be greatly increased by B/N doping. Both Sc/BMG and Sc/NMG can be used as potential hydrogen storage materials because the first adsorbed H2 is molecular. Sc/BMG could adsorb 5H2 with the average hydrogen adsorption energy of -0.18─-0.43 eV. The H2 adsorption sites of BMG could be increased by forming multiple Sc/C3B2 units. Sc/NMG could adsorb 6H2 with the average hydrogen adsorption energy of -0.17─-0.29 eV. The hydrogen storage capacity of Sc/NMG could be further improved by the formation of Sc/N3/Sc units.

Key words: Hydrogen storage, B/N-doped, Monovacancy graphene, 3d Transition metal, Density functional theory

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