Potentiodynamically deposited nickel oxide (NiO) nanoflakes for pseudocapacitors

• Potentiodynamic mode of electrodeposition for NiO film preparation.
• Nanoflakes-like morphology of NiO thin film with maximum specific capacitance of 222 Fg−1.
• The maximum values of specific energy and power were 14.6 W h kg−1 and 1.0 kW kg−1.

The present work demonstrates the preparation of NiO nanoflakes via potentiodynamic electrodeposition method. The structural and morphological analyses of the film have been presented. The pseudocapacitive properties are tested using cyclic voltammetry, charge–discharge and electrochemical impedance spectroscopy. The maximum value of specific capacitance obtained is 222 Fg−1.