The obtained linear sweep voltammetry (LSV) curves are shown in Fig. , while the overpotentials (η) for an intensity of 10 and 20 mA•cm -2 are depicted in Fig. . It is interesting to point out the significant decrease of η (absolute value), when the bulk material is exfoliated. The best results are performed by the MnPS 3 @H 2 O system, since in this case a higher number of active sites are accessible to H 3 O + ions obtaining a value of η which is ~300 mV lower than previously reported results. Nevertheless, through AFM studies, we know that bare layers are not stable for long time in solutionand this could be a handicap for the use of this material in commercial catalytic applications.