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Hydrothermally produced Mo-doped WO3 nanoparticles and their enhanced photocatalytic and electrochemical properties

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Abstract

In this study, pure WO3 as well as doped with molybdenum (0, 2.5, and 5 at%) nanoparticles were successfully synthesized via sol-gel processing followed by a hydrothermal approach. The physicochemical characteristics of WO3 and Mo-doped WO3 nanoparticles were thoroughly characterized using techniques, including XPS, FESEM, HRTEM, UV–Visible, photoluminescence, cyclic voltammetry and electrochemical impedance spectroscopy. Results predicted that the insertion of Mo into the WO3 lattice had a prominent effect on morphology as well as microstructure. The addition of Mo ions in WO3 NPs narrowed the bandgap of WO3 and enhanced its ability of light absorption. Band gap energy of pure WO3 nanoparticles is reduced from 2.77 to 2.49 eV with Mo (5 at%) doping. The photocatalytic behaviour of prepared nanoparticles was investigated through the photodegradation of an organic dye (methyl orange, MO) in an aqueous solution in presence of UV–Visible light. Photocatalytic activity of WO3 nanoparticles could considerably be increased with Mo doping, which might be due to the redshift of absorption edge as well as the lowering of recombination rate of electron-hole pairs caused by the trapping of charge carriers through crystal defects. The degradation efficiency of photocatalyst against methyl orange (MO) dye is enhanced from 71.1 to 86.1% with the incorporation of Mo ions in WO3.The electrochemical properties of undoped WO3 nanoparticles, and Mo-doped WO3 nanocomposite, were investigated through cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance measurements and analysis. The specific capacitance is increased from 255.6 to 488.9 Fg−1 through Mo (5 at%) doping in WO3 NPs. The present findings recommend that 5% Mo-doped WO3 nanocomposite provides a promising direction for the development of high quality, effective and reliable photocatalytic and electrode material for organic dyes degradation and hybrid supercapacitors respectively.

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The datasets used and analyzed during the current study are available from the corresponding authors on reasonable request.

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Acknowledgements

The authors extend their sincere appreciation to the Researchers Supporting Project number (RSP2024R130), King Saud University, Riyadh, Saudi Arabia for funding research.

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  1. King Abdullah Institute for Nanotechnology, King Saud University, 11451, Riyadh, Saudi Arabia

    Mohd Abdul Majeed Khan, Anees Ahmad Ansari & Maqusood Ahamed

  2. Department of Physics, Chaudhary Devi Lal University, Sirsa, 125055, India

    Manjeet Pawar, Sushil Kumar & Saruchi Rani

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Contributions

M. A. Majeed Khan: conceptualization, methodology, validation, investigation, funding acquisition project, supervision, visualization, project administration, writing-original draft, writing-review and editing. Manjeet Pawar: formal analysis, investigation, methodology, validation, visualization, software, data curation. Anees A. Ansari: data curation, formal analysis, administration, resources, writing-review and editing. Maqusood Ahamed: methodology, validation, visualization, investigation, formal analysis. Sushil Kumar: conceptualization, methodology, data curation, investigation, formal analysis, resources. Saruchi Rani: investigation, formal analysis, software, editing.

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Khan, M.A.M., Pawar, M., Ansari, A.A. et al. Hydrothermally produced Mo-doped WO3 nanoparticles and their enhanced photocatalytic and electrochemical properties. J Mater Sci: Mater Electron 35, 1565 (2024). https://doi.org/10.1007/s10854-024-13336-3

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