Effects of interactions between NiM (MÂ =Â Mn, Fe, Co and Cu) bimetals with MgO (1Â 0Â 0) on the adsorption of CO2

► The existence of oxygen vacancy decreases the adsorption of CO2 on NiM/MgO. ► NiCo shows the strongest interaction with MgO. ► NiCo substrates show the highest CO2 chemisorptions.