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MOMANYI FINAL 5 10 23 with cert.pdf (1.86 MB)

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Fabrication of Tungsten Oxide Thin Film on Stainless Steel by Sol-Gel Method

Momanyi, Geoffrey Ogoso
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1683732746275437

Abstract Details

2023, Master of Science in Chemistry, Youngstown State University, Department of Biological Sciences and Chemistry.
Metal oxide semiconductor materials such as tungsten oxide are promising candidates for use as photoanodes in solar water splitting. Tungsten oxide is an n-type semiconductor that was prepared on stainless steel 304 substrate and subsequently studied for water-splitting applications. This study investigated the effect of the annealing temperature and substrate cleaning reagents on the photoelectrochemical (PEC) properties of tungsten oxide thin films. The main method of synthesis employed was the sol-gel method. Tungsten oxide thin films were deposited from a precursor solution of peroxotungstic acid by doctor blading. The as-deposited amorphous WO3 films were further subjected to heat treatment at various annealing temperatures (200 ℃, 300 ℃, 400 ℃, and 500 ℃) to transform the amorphous material into polycrystalline WO3 nanostructures. Surface morphology, the crystallinity of the film, the thickness of the film, and photoelectrochemical properties were investigated using scanning electron microscopy, (SEM), X-ray diffractometry (XRD), stylus profilometry, cyclic voltammetry (CV), and linear sweep voltammetry (LSV). The optimal WO3 film, at a thickness of 5 µm and annealed at 400 ℃, achieved a photocurrent density of 98.0 µA/cm2 at an applied voltage of 0.53 V vs Ag/AgCl. It is essential to treat the substrate with HNO3 to passivate the surface of the stainless-steel substrate with the Cr2O3 layer.
Clovis Linkous, PhD (Advisor)
Timothy Wagner, PhD (Committee Member)
Christopher Arntsen, PhD (Committee Member)
82 p.
Alternative Energy; Analytical Chemistry; Chemistry; Energy; Environmental Science; Nanotechnology
tungsten oxide; sol-gel; thin films; stainless steel

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Citations

  • Momanyi, G. O. (2023). Fabrication of Tungsten Oxide Thin Film on Stainless Steel by Sol-Gel Method [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1683732746275437

    APA Style (7th edition)

  • Momanyi, Geoffrey. Fabrication of Tungsten Oxide Thin Film on Stainless Steel by Sol-Gel Method. 2023. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1683732746275437.

    MLA Style (8th edition)

  • Momanyi, Geoffrey. "Fabrication of Tungsten Oxide Thin Film on Stainless Steel by Sol-Gel Method." Master's thesis, Youngstown State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1683732746275437

    Chicago Manual of Style (17th edition)

ysu1683732746275437
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© 2023, all rights reserved.
This open access ETD is published by Youngstown State University and OhioLINK.