Support effect on H adsorption on a metal atom

► We examine the support effect of a TiO2 surface on H adsorption on a metal atom (MK to Zn). ► For MK, Co, Ni and Cu, the TiO2 support yields a decrease of M-H interactions strength. ► For MCa to Fe and for Zn, the TiO2 support increases the strength of M-H interaction. ► Increase occurs when M possesses two or more easily transferable electrons.