Understanding electrochemical performance of Ni(OH)2 films: a study contributions to energy storage

Nanostructured Ni(OH)2 was grown on the surface of a Ti plate via electrodeposition method. Analytical methods were employed to characterize the structure, morphology, and electrochemical performance of the samples. A voltammetry detailed study was used to determine the different contributions to the total stored charge. Based on the electrochemical impedance spectroscopy study, the results are discussed in terms of complex capacitance and complex power. The relaxation time constant of the systems and capacitance values at low frequency for different potentials were determined from complex capacitance plots. The Ni(OH)2 sample exhibited excellent electrochemical performance at different current densities and good cycling ability, 99.3% of the initial capacity (951.5 mA h g−1) remains after 1000 cycles of charge-discharge.