Adsorption and diffusion of H2O molecule on the Be(0001) surface: A density-functional theory study

TL;DR

This study uses density-functional theory to analyze how water molecules adsorb and diffuse on the Be(0001) surface, revealing weak binding, specific electronic interactions, and no dissociation, which informs surface chemistry understanding.

Contribution

First-principles calculations provide detailed insights into water adsorption, diffusion, and electronic interactions on Be(0001), highlighting the weak binding and absence of dissociation.

Findings

Adsorption energy of water on Be(0001) is about 0.3 eV.

Diffusion activation energy for water on the surface is about 0.3 eV.

No dissociation state of water on Be(0001) surface was observed.

Abstract

Using first-principles calculations, we systematically study the adsorption behavior of a single molecular H$_{2}$O on the Be(0001) surface. We find that the favored molecular adsorption site is the top site with an adsorption energy of about 0.3 eV, together with the detailed electronic structure analysis, suggesting a weak binding strength of the H$_{2}$O/Be(0001) surface. The adsorption interaction is mainly contributed by the overlapping between the $s$ and $p_{z}$ states of the top-layer Be atom and the molecular orbitals 1$b_{1}$ and 3$a_{1}$ of H$_{2}$O. The activation energy for H$_{2}$O diffusion on the surface is about 0.3 eV. Meanwhile, our study indicates that no dissociation state exists for the H$_{2}$O/Be(0001) surface.