Electrodeposited endeavour: Concentration-tuned nickel oxide nanostructures for high-performance supercapacitors

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Herein we focused on synthesis of concentration modulated nickel oxide (NiO) nanosheets by simple and straightforward electrodeposition technique to investigate physicochemical properties and eventually electrochemical performance . Cubic and hydrophilic NiO nanosheets with optimum crystallite size, porosity and mixed Ni 2+ / Ni 3+ states show pseudocapacitive nature with excellent performance. It is observed that, 956.22 F/g specific capacitance at 5 mV/s scan rate. The diffusion controlled reaction kinetics during charging and discharging process shows 25.04 Wh/kg and 3.41 kW/kg energy and power density respectively. The optimized sample exhibits lower values for series and charge transfer resistance due to the conducting channel developed through interconnected nanoparticles . Moreover, electrochemical performance of liquid state symmetric supercapacitor device is measured. The overall study reveals electrodeposited NiO nanostructures are an ideal candidate for energy storage applications.