Effect of various aqueous electrolytes on the electrochemical performance of porous NiO nanocrystals as electrode material for supercapacitor applications

[Display omitted] •A porous NiO nanocrystal was synthesised by the hydrothermal method.•NiO nanocrystal is analyzed using various aqueous electrolyte solutions.•NiO nanocrystal delivers a high capacity of CP is 200 F/g at 1 A/g using 1 M Na2SO4.•Good cyclic stability around 2000 cycles with capacity retention of 91% at 10 A/g. The electrochemical performance of porous Nickel oxide nanocrystals synthesised by the hydrothermal method is discussed here. In this porous Nickel oxide, crystal structure and morphology were investigated by XRD, FT-Raman, FE-SEM and HR-TEM. The electrochemical performance of porous Nickel oxide electrode examined by various aqueous electrolytes such as 1 M Na2SO4, 0.5 M KOH and 1 M Na2SO4 + 0.5 M KOH solution. The electrode material delivers high specific capacitance found as 200 F/g at 1 A/g using a single aqueous electrolyte 1 M Na2SO4. The porous Nickel oxide nanocrystals electrode performed the long-term good cyclic stability around 2000 cycles with 91% capacity retention. Here, 1 M Na2SO4 electrolyte achieves high capacity among various electrolytes can be considered as promising electrode material for supercapacitor applications.