International Journal of Nanoscience and Nanotechnology

International Journal of Nanoscience and Nanotechnology

Efficient Single-Step Biosynthesis of Copper Nanoparticles using Essential Oil Extracted from Curry Leaves (Murraya koenigii) for Supercapacitor Electrodes in Energy Storage Applications

Document Type : Research Paper

Authors
Byrapogu Purna Chandra Rao 1
Uppu Naga Babu 2
Bhagya Kumar Tatavarti 3
Kandula Rekha 4
Venkateswara Rao Anna 1
1 Department of Chemistry, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur - 522302, A.P., India
2 Department of Engineering Chemistry, S.R.K.R. Engineering College, Chinna Amiram, Bhimavaram - 534204, A.P., India
3 Department of Chemistry, K.B.N. College (Autonomous), Kothapeta, Vijayawada - 520001, A.P., India
4 Department of Biotechnology, Dr.V.S Krishna Govt. Degree College, Visakhapatnam - 530022, A.P., India
10.22034/ijnn.2025.2025479.2499
Abstract
    Nanobiotechnology is an innovative branch of modern science that has brought significantly changed in material research. The present highlights the use of essential oil collected from curry leaves (Murraya koenigii) as a simple, affordable, and efficient reducing agent for the fabrication of copper oxide (CuO) nanoparticles (NPs). These NPs were evaluated for their potential as electrodes in supercapacitors. During the synthesis, the solution changed from pale blue to green and finally to reddish-brown. This indicates the reduction of Cu²⁺ ions in copper sulfate to CuO NPs, which showed a characteristic UV-visible absorption peak at 292 nm. GCMS analysis reveals that compounds such as α-Terpinene, Linalool, Myrcene, Geranyl acetate, Elemol, and Allo-Ocimene in the essential oil played a role in NPs formation. The NPs were primarily spherical in shape with 24 nm average particle size. These particles exhibit a monoclinic crystal structure with 81.26% of elemental copper. Cyclic voltammetry results showed specific capacitances of 369, 324, 305, 265, and 210 F/g respectively at scan rates of 10, 20, 40, 60, and 100 mV/s. The maximum specific capacitance was noticed to be 369 F/g, with a retention capacity of 97.6% even after 6000 charge-discharge cycles demonstrating that these NPs have suitability for supercapacitor applications. These results suggest that biologically synthesized CuO NPs have great potential for utilization as energy storage devices, particularly as supercapacitor electrodes.
Keywords
Green synthesis
Essential oil
GCMS analysis
CuO NPs
Supercapacitor applications

Subjects

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International Journal of Nanoscience and Nanotechnology
Volume 20, Issue 3
2024
Pages 197-207