Eco-friendly green synthesis of Fe-doped WS2 using neem leaf extract: unlocking large interlayer spacing for improved capacitance and rapid ion transport

Iron-doped tungsten disulfide (Fe-WS2) nanoparticles were synthesized via a green method using neem leaf extract. X-ray diffraction (XRD) confirmed structural changes, with the formation of a hexagonal structure. The d-spacing is increased by Fe doping (6.05–6.08 Å). Fourier-transform infrared (FTIR...

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Bibliographic Details
Published in:RSC advances 2024-12, Vol.14 (53), p.39727-39739
Main Authors: Khan, M I, Mujtaba, Ali, M Arslan Nadeem, Majeed, Amira, Ezzine, Safa, Alshahrani, Dhafer O
Format: Article
Language:English
Subjects:
Blue shift
Capacitance
Charge transfer
Chemical synthesis
Chemistry
Diffusion coefficient
Electrochemical impedance spectroscopy
Electrons
Energy bands
Fourier transforms
Infrared analysis
Infrared spectroscopy
Interlayers
Ion diffusion
Ion transport
Iron
Optical properties
Spectrum analysis
Tungsten disulfide
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Summary:Iron-doped tungsten disulfide (Fe-WS2) nanoparticles were synthesized via a green method using neem leaf extract. X-ray diffraction (XRD) confirmed structural changes, with the formation of a hexagonal structure. The d-spacing is increased by Fe doping (6.05–6.08 Å). Fourier-transform infrared (FTIR) spectroscopy identified W–S and S–S bond vibrations, crucial for material integrity. The Brunauer–Emmett–Teller (BET) analysis confirmed the increased surface area and pore radius as a result of enhanced ions diffusion. The morphology study through Scanning Electron Microscopy (SEM) revealed enhanced porosity of Fe-WS2, as evidenced by the more granular and disordered structure. UV-vis spectroscopy (UV-vis) showed a blue shift and an increased energy band gap from 2.48 eV to 2.64 eV, indicating improved optical properties. Methyl blue (MB) dye adsorption spectra showed that the Fe-WS2 is porous, and as a result, more electrolyte adsorbs within the electrode. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) revealed enhanced specific capacitance and energy density. Electrochemical impedance spectroscopy (EIS) demonstrated a significant reduction in charge transfer resistance and a substantial increase in the ion diffusion coefficient. These findings underscore the potential of Fe-WS2 for high-performance energy storage devices.
ISSN:2046-2069
2046-2069
DOI:10.1039/d4ra07012g