Sustainable hydrothermal synthesis of cobalt‐nickel nanomaterial for supercapacitor using green stabilizing agents

Abstract

We have utilized Euphorbia cognata Boiss as a source of reducing and stabilizing agents for the synthesis and the functionalization facile Co 3 O 4 :NiO nanomaterial following hydrothermal route. The phases (Co 3 O 4 and NiO) of synthesized nanomaterial were identified by X-ray diffraction, while spherical nanostructures were scrutinized by field emission scanning electron microscopy. The X-ray photoelectron spectroscopy was used to study surface modification, which revealed the presence of organic O and organic C groups.Furthermore, Tauc plot exhibited a low bandgap of 2.58 eV proposing the improved electrochemical characteristics of synthesized nanomaterial. A reasonable capacitance of 188 and 74 F/g was revealed at 2 mV/s and at 1 A/g, respectively. While the extremely low internal resistance (R i ) of 0.8 Ω was determined in the current study, suggesting the good electrochemical conductivity of Co 3 O 4 :NiO. Therefore, the present study demonstrated the good electrochemical behavior of the fabricated electrode toward supercapacitor, which was attributed to the increased active sites due to bioactive compounds.

Eutectic‐derived bimodal porous Ni@ NiO nanowire networks for high‐performance Li‐ion battery anodes

“…The indexed peaks at 37.3 , 43.3 , 62.9 , and 75.4 accord with the 111, 200, 220, and 311 facets of NiO phase (JCPDS NO. 78-0643), 53,54 confirming the presence of NiO which formed via the spontaneous oxidation during the free etching. In addition, the Bragg diffraction peaks locate at 44.5 , 51.8 , and 76.4 relate to the (111), (200), and (220) planes of the Ni phase (JCPDS NO.…”

Electron beam deposited (Cu2S‐CdS)GOthin film as active electrode for supercapacitor and enhanced photocatalyst for water remediation

“…The specific capacitance of the material is calculated after performing these tests. “Cyclic voltammogram is an experimental criterion for qualitatively judging capacitive behavior of a device or electrode made from a synthetic pure or composite material of interest.” 42 The CV curve obtained after the CV tests is analyzed and its absolute area, the applied potential window, and the scan rate are used in the equation used for the calculation of specific capacitance 43 . Another technique used for the investigation of the synthesized electrode was LSV.…”

“…42 The CV curve obtained after the CV tests is analyzed and its absolute area, the applied potential window, and the scan rate are used in the equation used for the calculation of specific capacitance. 43 Another technique used for the investigation of the synthesized electrode was LSV. The electron transfer reaction kinetics can be analyzed through it.…”