Green synthesis of CuFeS 2 nanoparticles using mimosa leaves extract for photocatalysis and supercapacitor applications
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RESEARCH PAPER
Green synthesis of CuFeS2 nanoparticles using mimosa leaves extract for photocatalysis and supercapacitor applications Hope E. Nsude & Kingsley U. Nsude & Goodfriend M. Whyte & Raphael M. Obodo & Chinedu Iroegbu & M. Maaza & Fabian I. Ezema Received: 5 August 2020 / Accepted: 27 October 2020 # Springer Nature B.V. 2020
Abstract We successfully synthesized CuFeS2 nanoparticles (NPs) using a simple synthesis method mediated by touch me not (Mimosa pudica) leaves extract. Xray 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 CuFeS 2 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 CuFeS 2 NPs. The CuFeS 2 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
This article is part of the topical collection: Nanotechnology Convergence in Africa Guest Editors: Mamadou Diallo, Abdessattar Abdelkefi, and Bhekie Mamba H. E. Nsude : K. U. Nsude : G. M. Whyte : R. M. Obodo : F. I. Ezema Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State 410001, Nigeria
M. Maaza : F. I. Ezema Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa
R. M. Obodo National Center for Physics, Islamabad 44000, Pakistan
M. Maaza : F. I. Ezema (*) UNESCO-UNISA Africa Chair in Nanosciences/ Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa e-mail: [email protected]
R. M. Obodo NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an 710072, China C. Iroegbu Department of Physics, Federal University of Technology, Imo State, Owerri, Nigeria
e-mail: [email protected]
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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. Keywor
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