Onion Seed Essential Oil-Grafted Zerovalent Copper Nanoparticles as Promising Material for Supercapacitor Electrodes in Energy Storage Device: Onion seed Essential oil-grafted zerovalent copper nanoparticles

• Published in: Asian journal of chemistry 2024-05, Vol.36 (6), p.1273-1280
• Main Authors: Kongara, Ramanjaneyulu, Usha Rani, N., Prasad Rao, T.S.R.K.
• Format: Article
• Language: English
• ISSN: 0970-7077; 0975-427X
• DOI: 10.14233/ajchem.2024.31368

Nanobiotechnology was considered as unique branch of contemporary science that facilitates paradigm shift in the field of material research. This study utilizes easy, convenient and cost-effective essential oil isolated from the onion seed as reducing agent for fabrication of copper nanoparticles and applicability of synthesized nanoparticles as supercapacitor electrodes. In the synthesis process, solution colour turned from pale blue to green and then it reach reddish brown colour due to reduction in Cu2+ in copper sulphate in to Cu0 nanoparticles that exhibit characteristic wavelength maxima of 292 nm on UV-visible spectrophotometer. The GCMS analysis confirms the involvement of 2-phenylethanol, 1-hexanol, α-phellandrene, 2-pentylfuran, palmitic acid and trimethylbenzene from essential oil in the formation of nanoparticles. The particles were in spherical shape with most abundant particle size of ~ 17 nm having monoclinic phase crystal structure with 80.95% copper content. The supercapacitor application of the synthesized nanoparticles was investigated through electrochemical investigation. The specific conductance of synthesized nanoparticles was assessed through cyclic voltammetry that exhibit an impressive response of 364, 332, 311, 255 and 206 F/g, respectively at 10, 20, 40, 60 and 100 mV/s. The specific capacitance of nanoparticles was confirmed as 364 F/g with 97.1% retention capacity after 6000 cycles. The findings indicate that copper oxide nanoparticles, obtained biologically, exhibit promising applicability with well-suitability for use in the energy storage devices. Overall, the results of the current study show that the biologically produced copper oxide nanoparticles have intriguing uses as supercapacitor electrodes.