Abstract
We successfully synthesized CuFeS2 nanoparticles (NPs) using a simple synthesis method mediated by touch me not (Mimosa pudica) leaves extract. X-ray diffraction (XRD) was used to analyze the structural properties, and it shows that the CuFeS2 NPs have a tetragonal structure and quasi-pyramidal NPs of an average crystallite size of 31.0 nm with a secondary phase of few minor peaks of covellite (CuS). The optical characterization showed that CuFeS2 NPs have band gap energy ranges of 1.98–2.46 eV for different annealing temperatures. The electrochemical properties of the CuFeS2 NPs were investigated using cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS). An appreciable value of specific capacitance of 501.4 F/g was obtained at a scan rate of 10 mV/s for the CuFeS2 NPs annealed at 250 °C which can be said to be within the optimum ideal annealing temperature for CuFeS2 NPs. The CuFeS2 NPs was used in the photodegradation of methylene blue (MB) under of solar irradiation. The highest rate constant of 3.1 × 10−2 min−1 and degradation efficiency of 98% were obtained for the unannealed CuFeS2 NPs with good stability after three cycles. Therefore, the synthesized CuFeS2 NPs were obtained using a Mimosa pudica leaves extract prospective application in both electrochemical energy storage devices and treatment of water contaminants. GO was added to increase the active sites for these ions, surface area, and conductivity of these electrodes for enhanced supercapacitive performance.
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The authors confirm that the data supporting the findings of this study are available from the corresponding author (Prof. F. I. Ezema) upon reasonable request.
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Acknowledgments
RMO humbly acknowledges NCP for their PhD fellowship (NCP-CAAD/PhD-132/EPD) award and COMSATS for travel grant for the fellowship. RMO also acknowledges PPSMB Enugu State, Nigeria, for the study leave permission granted. FIE (90407830) cordially acknowledges UNISA for VRSP Fellowship award and also graciously acknowledges the grant by TETFUND under contract number TETF/DESS/UNN/NSUKKA/STI/VOL.I/B4.33. Also, we thank Engr. Emeka Okwuosa for the generous sponsorship of April 2014, July 2016, and July 2018 conferences/workshops on applications of nanotechnology to energy, health, and environment and for providing some research facilities.
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This article is part of the topical collection: Nanotechnology Convergence in Africa
Guest Editors: Mamadou Diallo, Abdessattar Abdelkefi, and Bhekie Mamba
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Nsude, H.E., Nsude, K.U., Whyte, G.M. et al. Green synthesis of CuFeS2 nanoparticles using mimosa leaves extract for photocatalysis and supercapacitor applications. J Nanopart Res 22, 352 (2020). https://doi.org/10.1007/s11051-020-05071-7
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DOI: https://doi.org/10.1007/s11051-020-05071-7