Abstract
In the present investigation, we have synthesized samarium (Sm) nanoparticles (NPs) and anchored them onto the surface of CuO:CoO nanostructure (NS) by utilizing a simple chemical precipitation method. Nanostructures (NS) were characterized utilizing powdered X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron spectroscopy (SEM), transmission electron spectroscopy (TEM), UV–visible spectroscopy (UV–Vis), and Brunauer–Emmett–Teller (BET) studies. Resulting Smx CuO: CoO (x = 1%, 5%, 10%, and 12%) NS were investigated for their anomalous electrical and supercapacitive behavior. NS energy storage performance was experimentally determined using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). Sm10%CuO:CoO exhibited better electrochemical response than other samples and showed a maximum specific capacitance of 283.6 F/g at 0.25 A/g in KOH electrolyte. However, contrary to our expectation, NS displayed rectifying nature in I-V, intercalative nature in C-V, and polaronic permittivity in all concentrations of Sm2O3 doping as compared with undoped CuO:CoO NS. The outstanding properties of Smx CuO:CoO NS are attributed to the synergy of high charge mobility of Sm NPs, leading to significant variation in dielectric permittivity, current–voltage (I-V) response, capacitance–voltage (C-V) behavior, with the formation of Sm3+ ionic cluster. The clusters lead to a change in dipole moment creating a strong local electric field. Additionally, a CR2032 type symmetric supercapacitor cell was fabricated using Sm10%CuO:CoO, which exhibited a maximum specific capacitance of 67.4 F/g at 0.1 A/g. The cell was also subjected to 5000 GCD cycles where it retained 96.3% Coulombic efficiency.
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Data that supports the findings of this study are available from the corresponding author by request email.
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Acknowledgements
All the authors are thankful to Centre for advanced Research, MSRIT, Bangalore, Karnataka, India, for the characterization of the samples and the Central university of Karnataka for carrying out electrical and super capacitive property studies.
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Dr Vinayak Adimule wrote the paper and handled the revisions of the manuscript. Dr. Basappa C Yallur conceived the ideas, synthesis, and characterization of the nanostructures. Dr. Sheetal Batakurki conceived the ideas, synthesis, and purification of the nanostructures. Mr. Vinay S Bhat was involved in the electrochemical analysis supercapacitor cell fabrication and analysis and prepared part of the manuscript. Dr. Rajeev Joshi carried out electrical and energy storage properties of the nanostructure and wrote the paper. Dr. Gurumurthy Hegde was involved in revising the paper and conceived the ideas.
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Adimule, V., Bhat, V.S., Joshi, R. et al. Enhanced electrical properties of CuO:CoO decorated with Sm2O3 nanostructure for high-performance supercapacitor. J Solid State Electrochem 27, 511–529 (2023). https://doi.org/10.1007/s10008-022-05343-3
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DOI: https://doi.org/10.1007/s10008-022-05343-3