中国物理B ›› 2023, Vol. 32 ›› Issue (6): 66803-066803.doi: 10.1088/1674-1056/ac8ce2
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,‡
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,‡
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.
中图分类号: (Ab initio calculations of adsorbate structure and reactions)