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

We have utilized Euphorbia cognata Boiss as a source of reducing and stabilizing agents for the synthesis and the functionalization facile Co3O4:NiO nanomaterial following hydrothermal route. The phases (Co3O4 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 omega was determined in the current study, suggesting the good electrochemical conductivity of Co3O4: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.

Automated summary

Euphorbia cognata Boiss was utilized as a source of reducing and stabilizing agents for the synthesis and functionalization of Co3O4:NiO nanomaterial. The synthesized nanomaterial exhibited excellent electrochemical characteristics, making it suitable for supercapacitor applications.