Nanostructured nickel oxide ultrafine nanoparticles: Synthesis, characterization, and supercapacitive behavior

Well-dispersed NiO nanoparticles were prepared via cathodic electrodeposition followed by a heat-treatment method. The supercapacitive performance of the prepared nanoparticles was analyzed by means of cyclic voltammetry (CV) and galvanostatic charge-discharge tests at -0.2-0.5 V potential windows in 1 M KOH. The nanoparticles exhibited high specific capacitance (1623.1 F g(-1) at the scan rate of 5 mV s(-1)) and good long-term cycling stability (9.6% capacity decay after 1000 cycling at the current density of 2 A g(-1)). (C) 2014 Elsevier Ltd. All rights reserved.