Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

K. Rudresha1,2, A. Zahir Hussain2, Ravikumar C. R.1,*, M. R. Anil Kumar1, Nagaswarupa H. P.3, M. S. Santosh4, H. C. Ananda Murthy5,*

1Research Centre, Department of Science, East West Institute of Technology, Bangalore 560091, Karnataka, India

2Post Graduate and Research Department of Chemistry, Jamal Mohamed College (Autonomous) Affiliated to Bharathidasan University, Tiruchirappalli 620020, Tamilnadu, India

3Department of Studies in Chemistry, Davanagere University, Shivagangothri, Davanagere 577007, Karnataka, India

4Centre for Incubation, Innovation, Research and Consultancy (CIIRC), Jyothi Institute of Technology, Bangalore 560082, Karnataka, India

5Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University,
P.O. Box 1888, Adama, Ethiopia

Adv. Mater. Lett., 2020, 11 (12), 20121586

DOI: 10.5185/amlett.2020.121586

Publication Date (Web): Nov 09, 2020

E-mail: ravicr128@gmail.com; (C.R.R.anandkps350@gmail.com (H. C. A.)

Abstract


The green CuO NPs were successfully synthesised by green solution combustion method. The average crystallite size of green solution combustion CuO nanoparticles (gsc-CONPs) was found to be 40.64 nm and confirmed by powder X-ray diffraction (PXRD) analysis. The UV-DRS spectrum revealed average energy gap of 1.75 eV for gsc-CONPs. Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) techniques have been employed to analyse the electrochemical properties of the synthesized sample by using carbon paste electrodes in 1M KOH solution. The observed results suggest superior electrochemical properties of gsc-CONPs electrode due to its lower value of EO-ER. It also exhibited better sensor characteristics for paracetamol and glucose molecules. The proton diffusion coefficient (D) for the gsc-CONPs electrode material was found to be 1.134 × 10-4 cm2s-1. The g-CONPs have also been tested for its photocatalytic activity using indigo carmine (IC) dye. The mechanism suggests that the crucial role was played by OH radicals during dye degradation. The results support the claim of the synthesized gsc-CONPs as a promising material for photocatalytic and supercapacitor applications.

Keywords

Green CuO NPs, Proton diffusion co-efficient, dye degradation, photocatalysts, electrochemical studies.

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