Electrochemical and Photocatalytic Properties of Green Nickel Oxide Nanomaterial Synthesized using Plectranthus Amboinicus Plant Leaf Extract

N.B. Arun Kumar1, J. Sirajudeen1, H.P. Nagaswarupa2, C.R. Ravikumar3,*, M.R. Anil Kumar3, H.C. Ananda Murthy4,*

1Department of Chemistry, Jamal Mohamed College, Tiruchirappalli 620020, Tamilnadu, India

2PG Centre, Department of Chemistry, Davanagere University, Davanagere 577001, Karnataka, India 

3Research Centre, Department of Chemistry, East West Institute of Technology, Bangalore 560091, India                          

4Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia

Adv. Mater. Lett., 2020, 11 (9), 20091559

DOI: 10.5185/amlett.2020.091559

Publication Date (Web): Aug 07, 2020

E-mail: ravicr128@gmail.com; anandkps350@gmail.com


We report the successful synthesis of NiO nanomaterial by combustion method using Plectranthus amboinicus plant leaves extract. The diffraction pattern and image analysis confirmed the FCC lattice structure for green NiO nanomaterial (g-NONM) with spongy, agglomerated and porous nature. The average energy band gap of g-NONM was found to be 4.10 eV. The electrode made of g-NONM exhibited excellent stability in addition to its good reversibility. The g-NONM showed superior photo-decolarisation results for AO dye solution with 33.95 % dye decolorization at 405 nm. The obtained rate constant k value of g-NONM for AO dye is 0.002933 min−1. The prepared g-NONM electrode showed a minimum charge-transfer resistance which is possibly due to its high conductivity as supported by electrochemical impedance studies. The NiO electrode also exhibited very high alcohol sensing ability in alkaline medium as revealed during CV measurement. The best part of the study was the fast reply (3 s) of the prepared electrode in sensing the drugs at 1 mM concentration solution. In addition, g-NONM can be easily fabricated into stable electrode material for supercapacitors applications. The results suggested that g-NONM can be an efficient and cheaper material for photocatalytic, sensor and supercapacitor applications.


Green-NiO NMs, plectranthus amboinicus, photocatalyst, sensor, supercapacitor.

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