Facile synthesis and characterization of Co3O4 nanoparticles for high-performance supercapacitors using Camellia sinensis

• Published in: Applied physics. A, Materials science & processing Vol. 126; no. 3
• Main Authors: Anuradha, C. T., Raji, P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2020; Springer Nature B.V
• Subjects: Amino acids; Annealing; Antioxidants; Applied physics; Characterization and Evaluation of Materials; Cobalt oxides; Condensed Matter Physics; Electrochemical analysis; Green tea; Lipids; Machines; Manufacturing; Materials science; Nanomaterials; Nanoparticles; Nanotechnology; Optical and Electronic Materials; Phenols; Physics; Physics and Astronomy; Processes; Stabilizers (agents); Supercapacitors; Surfaces and Interfaces; Synthesis; Thin Films; NPs; Annealing temperature; Green synthesis; Co; Cyclic voltametry; O
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-020-3352-8

In this study, synthesis and characterization of cobalt oxide nanoparticles (Co
3
O
4
NPs) using green tea leaf (Camellia sinensis) and its utilization as high-performance supercapacitors has been studied. Co
3
O
4
NPs were fabricated utilizing aquatic extract of
Camellia sinensis
as a reduction agent, and it was annealed at various annealing temperatures, such as 200 °C, 400 °C, 600 °C, and 800 °C for 2 h. The synthesized Co
3
O
4
NPs were analyzed using XRD, FESEM, EDX, HRTEM, PL, FTIR, UV–visible techniques. The higher concentration of phenolic compounds with antioxidant potential, amino acids, proteins and lipids in Camellia sinensis act as the reducing as well as the stabilizing agents for the growth of NPs. The XRD analysis confirms that the crystalline behavior of the annealed samples increases with increasing annealing temperature. The electrochemical performance of green synthesized nanostructured Co
3
O
4
NPs shows an excellent supercapacitance performance with quick dispersing of electrolyte ions into the Co
3
O
4
electrode owing to their rapid charging and discharging performances. This affirms that the bio-synthesized Co
3
O
4
nanomaterial is the appropriate material for high performance supercapacitor applications.