中国物理B ›› 2023, Vol. 32 ›› Issue (6): 66803-066803.doi: 10.1088/1674-1056/ac8ce2

• • 上一篇    下一篇

Grand canonical Monte Carlo simulation study of hydrogen storage by Li-decorated pha-graphene

Meng-Meng Zhang(张蒙蒙)1, Feng Zhang(张凤)1, Qiang Wu(吴强)2, Xin Huang(黄欣)1, Wei Yan(闫巍)1, Chun-Mei Zhao(赵春梅)1, Wei Chen(陈伟)1, Zhi-Hong Yang(杨志红)1, Yun-Hui Wang(王允辉)1,†, and Ting-Ting Wu(武婷婷)1,‡   

  1. 1 College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • 收稿日期:2022-06-05 修回日期:2022-08-04 接受日期:2022-08-26 出版日期:2023-05-17 发布日期:2023-06-05
  • 通讯作者: Yun-Hui Wang, Ting-Ting Wu E-mail:yhwang@njupt.edu.cn;wutt@njupt.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11904175, 11804169, and 11804165) and the Graduate Innovation Project of Jiangsu Province, China (Grant No. KYCX21 0700).

Grand canonical Monte Carlo simulation study of hydrogen storage by Li-decorated pha-graphene

Meng-Meng Zhang(张蒙蒙)1, Feng Zhang(张凤)1, Qiang Wu(吴强)2, Xin Huang(黄欣)1, Wei Yan(闫巍)1, Chun-Mei Zhao(赵春梅)1, Wei Chen(陈伟)1, Zhi-Hong Yang(杨志红)1, Yun-Hui Wang(王允辉)1,†, and Ting-Ting Wu(武婷婷)1,‡   

  1. 1 College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • Received:2022-06-05 Revised:2022-08-04 Accepted:2022-08-26 Online:2023-05-17 Published:2023-06-05
  • Contact: Yun-Hui Wang, Ting-Ting Wu E-mail:yhwang@njupt.edu.cn;wutt@njupt.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11904175, 11804169, and 11804165) and the Graduate Innovation Project of Jiangsu Province, China (Grant No. KYCX21 0700).

摘要: Grand canonical Monte Carlo simulation (GCMCs) is utilized for studying hydrogen storage gravimetric density by pha-graphene at different metal densities, temperatures and pressures. It is demonstrated that the optimum adsorbent location for Li atoms is the center of the seven-membered ring of pha-graphene. The binding energy of Li-decorated pha-graphene is larger than the cohesive energy of Li atoms, implying that Li can be distributed on the surface of pha-graphene without forming metal clusters. We fitted the force field parameters of Li and C atoms at different positions and performed GCMCs to study the absorption capacity of $\rm{H_{2}}$. The capacity of hydrogen storage was studied by the differing density of Li decoration. The maximum hydrogen storage capacity of 4Li-decorated pha-graphene was 15.88 wt% at 77 K and 100 bar. The enthalpy values of adsorption at the three densities are in the ideal range of 15 kJ$\cdot$mol$^{-1}$-25 kJ$\cdot$mol$^{-1}$. The GCMC results at different pressures and temperatures show that with the increase in Li decorative density, the hydrogen storage gravimetric ratio of pha-graphene decreases but can reach the 2025 US Department of Energy's standard (5.5 wt%). Therefore, pha-graphene is considered to be a potential hydrogen storage material.

关键词: hydrogen storage, pha-graphene, grand canonical Monte Carlo simulation (GCMCs), force field

Abstract: Grand canonical Monte Carlo simulation (GCMCs) is utilized for studying hydrogen storage gravimetric density by pha-graphene at different metal densities, temperatures and pressures. It is demonstrated that the optimum adsorbent location for Li atoms is the center of the seven-membered ring of pha-graphene. The binding energy of Li-decorated pha-graphene is larger than the cohesive energy of Li atoms, implying that Li can be distributed on the surface of pha-graphene without forming metal clusters. We fitted the force field parameters of Li and C atoms at different positions and performed GCMCs to study the absorption capacity of $\rm{H_{2}}$. The capacity of hydrogen storage was studied by the differing density of Li decoration. The maximum hydrogen storage capacity of 4Li-decorated pha-graphene was 15.88 wt% at 77 K and 100 bar. The enthalpy values of adsorption at the three densities are in the ideal range of 15 kJ$\cdot$mol$^{-1}$-25 kJ$\cdot$mol$^{-1}$. The GCMC results at different pressures and temperatures show that with the increase in Li decorative density, the hydrogen storage gravimetric ratio of pha-graphene decreases but can reach the 2025 US Department of Energy's standard (5.5 wt%). Therefore, pha-graphene is considered to be a potential hydrogen storage material.

Key words: hydrogen storage, pha-graphene, grand canonical Monte Carlo simulation (GCMCs), force field

中图分类号:  (Ab initio calculations of adsorbate structure and reactions)

  • 68.43.Bc
02.70.Tt (Justifications or modifications of Monte Carlo methods) 73.20.At (Surface states, band structure, electron density of states)