Thermal Desorption of Hydrogen From Graphene

TL;DR

This study investigates hydrogen desorption from graphane using molecular dynamics, revealing high thermal stability suitable for electronics but limited for hydrogen storage applications.

Contribution

It provides temperature-dependent desorption times and activation energies, highlighting the thermal stability and potential applications of graphane.

Findings

High thermal stability of graphane at room temperature

Desorption activation energies calculated from Arrhenius plots

Limited suitability of graphane for hydrogen storage in fuel cells

Abstract

The process of hydrogen desorption from graphane (graphene sheet saturated by hydrogen adsorbed from both sides) has been studied using the method of molecular dynamics. The temperature dependences of the time of desorption onset for various hydrogen coverages on graphene are calculated and the corresponding activation energies in the Arrhenius equation are determined. It is established that graphane exhibits a rather high thermal stability that makes possible its usein two-dimensional electronics even at room temperature. For the same reason, graphane can hardly be considered as a promising hydrogen storage material for fuel cells.