In this work density functional theory (DFT) and diffusion Monte Carlo (DMC) methods are used to calculate the binding energy of a H atom chemisorbed on the graphene surface. The Perdew-Burke-Ernzerhof (PBE) value of the binding energy is about 20% larger in magnitude than the diffusion Monte Carlo result. The inclusion of exact exchange through the use of the Heyd-Scuseria-Ernzerhof (HSE) functional brings the DFT value of the binding energy closer in line with the DMC result. It is also found that there are significant differences in the charge distributions determined using PBE and DMC approaches.
@article{arxiv.2202.00194,
title = {The binding of atomic hydrogen on graphene from density functional theory and diffusion Monte Carlo calculations},
author = {Amanda Dumi and Shiv Upadhyay and Leonardo Bernasconi and Hyeondeok Shin and Anouar Benali and Kenneth D. Jordan},
journal= {arXiv preprint arXiv:2202.00194},
year = {2022}
}
Comments
The following article has been submitted to The Journal of Chemical Physics