In general, both the electrode-electrolyte interface and the ionic accessibility on the electrode surface are decided by the wettability of the electrode towards the ions of the electrolyte. For instance, the N-doped graphene was prepared by hydrothermal method using hydrazine hydrate in ammoniacal solution at three different temperatures and the N-doped graphene prepared at 130 °C has got the maximum capacitance in 1 M KCl solution. This is because of the fact that the N-doped graphene obtained at 130 °C has higher content of pyrrolic N. It has been reported that pyridinic nitrogen has stronger binding towards K + ions compared to pyrrolic nitrogen . If the attraction is so stronger then it leads to the fact that the releasing of ions is not easier. Thus, the N-doped graphene formed at 130 °C has got the optimised wettability to K + ions. Hence the nature of doped N and its wettability towards ions of the electrolyte played a critical role in terms of electrochemical performance.