Chemisorption of HCl to the MgO(001) surface: A DFT study

A DFT study on the mechanism of HCl and CO2 capture by CaO

HCl exhibits a preferred interaction with the O atom of CaO (100) surface, with the adsorption energy of −1.85 eV. HCl and CO2 are in competition with one another at the O site. The presence of HCl inhibits CO2 adsorption and promotes CO2 desorption.

Effects of the cooperative interaction on the diffusion of hydrogen on MgO(100)

Understanding hydrogen diffusion is important for applications such as hydrogen storage and spillover materials. On semiconductors, where paired electron acceptors and donors stabilize each other, the hydrogen diffusion depends on the number of adsorbed fragments. Using density functional theory, we investigate the effects of preadsorbed hydrogens on activation energy and reaction path for hydrogen diffusion on MgO(100): the presence of an unpaired hydrogen causes a diffusion, on O-sites, above the surface with a lower activation energy compared to the case of paired hydrogens where the diffusion distorts the surface. This effect is missing for diffusion on Mg-sites.