Nickel Oxide Grown on Nickel Foam as Binder Free Electrodes: Synthesis and Electrochemical Capacitors Application

MARIELA GISELA ORTIZ; SILVIA GRACIELA REAL

Bolonia

Congreso; 69th Annual ISE Meeting; 2018

International Society of Electrochemistry

Supercapacitors or electrochemical capacitors have attracted much attention due to their ability to storecharges through fast charging and discharging process, and their excellent cycle life. Developing indifferent architectures, sizes, morphologies and compounds have been extensively investigated to be usedas electrode materials for supercapacitors [1-4].In this contribution, we present the preparation and characterization of nickel oxides as electrodematerials for electrochemical capacitors. The nickel oxides were synthesized by directly growing them onnickel foams, through a tube furnace calcination method at different temperatures (250°C, 350°C, 450°Cand 550°C). These materials were characterized employing scanning electron microscope, X-raydiffraction, thermogravimetric analysis and electrochemical techniques as: cyclic voltammetry, chargedischargecycles, galvanostatic discharge at different currents and electrochemical impedancespectroscopy. The analysis of all results, allowed us to improve the understanding of main physical,chemical and physico-chemical parameters that govern their electrochemical behaviour.The prepared electrodes exhibit a satisfactory specific capacity, cyclability and rate capability. Forexample, as shown in the figure, the highest obtained specific capacitance value was 1590 F g-1 for theprepared compound at 550°C, at the current density of 1 A g-1 and after 1000 cycles Therefore, nickeloxide materials grown on nickel foam, as binder free electrodes, appear.