In this section, we discuss the mechanistic pathways and potential energy diagrams for hydrolysis in detail. The mechanism is determined using the intrinsic reaction coordinate (IRC) method in the forward and reverse directions suggested by Fukui et al. The hydrolysis of water molecules absorbed on free ZnO trimers, and on the same trimers adsorbed on graphene and the functional groups of the four graphene oxides GO1, GO2, GO4, and GO5