Porous NiO/C Nanocomposites as Electrode Material for Electrochemical Supercapacitors

Abstract

NiO/C nanocomposites were synthesized at different calcination temperatures using starch as the stabilizing agent. The NiO/C nanocomposites were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The samples calcined at 500 °C exhibit a highly porous nature. Electrochemical investigations of NiO/C were carried out using cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy. NiO/C-5 shows excellent electrochemical performance compared to NiO/C-4 and NiO/C-6. The NiO/C-5 electrode exhibits a specific capacitance value of 644 F g −1 at a scan rate of 2 mV s −1 . The charge transfer resistance is 0.59 Ω for the NiO/C-5 electrode. This NiO/C-5 appears to be a promising electrode material for supercapacitor applications.

In situ preparation of NiO nanoflakes on Ni foams for high performance supercapacitors

“…3a shows the SC values of the corresponding CV curves. The SC of the composite is 1784.2 F/g at 5 mV/s, which is near the theoretical SC value of NiO [13] and is a high value compared with the reported works (989 F/g at 3 mV/s [14], 644 F/g at 2 mV/s [15]). The SC value of the composite still has 693.1 F/g at a high san rate of 100 mV/s, making it a promising material for supercapcitors at high charge/discharge current.…”

Mesoporous fluorine-doped carbon as efficient cathode material for oxygen reduction reaction

“…S1). The surface area of C-F-1000 is larger than that of C-F-900 (461 m 2 g À 1 ) and C-F-1100 (290 m 2 g À 1 ) [14]. The corresponding SEM images ( Fig.…”

Hierarchical CuCo2O4 nanobelts as a supercapacitor electrode with high areal and specific capacitance

“…But at high scan rate, the duration of OH -ion access is limited, resulting in a decreasing trend of capacitance as scan rate increases [28,29].…”