Yazar "Yusof, Yushamdan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Enhanced photoelectrochemical transient photoresponse properties of molybdenum oxide film deposited on black silicon
    (Elsevier, 2023) Jubu, Peverga R.; Yusuf, Bashir; Abdulkadir, Auwal; Obaseki, O. S.; Chahrour, Khaled M.; Yusof, Yushamdan; Dehiin, Hile D.
    Nanostructured black silicon (b-Si) is widely deployed for different solar applications due to its novel light-harvesting characteristics, and large surface area-to-volume ratio. The present research work applies a novel approach via the chemical vapour deposition method to prepare molybdenum oxide (MoO3) film on a b-Si substrate for photoelectrochemical application. X-ray diffraction revealed alpha-MoO3 phase, with the MoO3/b-Si film exhibiting a relatively large crystallite size and improved crystalline quality. Optical reflectance measure-ments showed a relatively low reflectance and reduced optical bandgap energy for the MoO3/b-Si film. Chro-noamperometric measurements showed an enhanced photocurrent density of 656.34 mu A/cm2 at 1 V bias for the MoO3/b-Si photoanode measured in a 0.5 M H2SO4 solution. The enhanced photoelectrochemical activity could be attributed to an increase in light absorption, the relatively small bandgap energy, improved crystalline quality, and improved charge carrier separation and transfer at the interface.
  • Küçük Resim Yok
    Öğe
    Titanium oxide nanotube film decorated with ?-Ga2O3 nanoparticles for enhanced water splitting properties
    (Pergamon-Elsevier Science Ltd, 2022) Jubu, Peverga R.; Chahrour, Khaled M.; Yam, F. K.; Awoji, O. M.; Yusof, Yushamdan; Choo, Ee Bee
    TiO2 is a wide bandgap material with inherent photogenerated charge carrier recombination problems, which reduces its photoelectrochemical (PEC) water splitting efficiency. Considerable efforts have been dedicated to reducing this charge recombination problems by decorating the film's surface using transition metal nano particles (NP) to enhanced device performance. And considerable numbers of literature reports are available to this respect. However, reports are rare for the surface modification of TiO2 nanotubes (TNT) arrays with metal oxide, specially by beta-Ga2O3 nanostructures and its potential applications. Herein, the PEC water splitting properties of beta-Ga2O3 NP (GNP)-modified TNT arrays is described. The TNT were synthesized by anodization, whereas the GNP were fabricated by chemical vapour deposition method. X-ray diffraction (XRD) results revealed the presence of weak beta-Ga2O3 peaks and reduction in crystallite size upon GNP addition. The integration of GNP on the TNT arrays resulted in a slight increase in optical bandgap from 3.4 to 3.6 eV observed by UV-vis measurements. Linear sweep voltammetry measurement for the modified TNT photocatalyst showed a 32.5% enhancement in photocurrent density compared to the bare TNT photoelectrode, measured in 1 M HCl solution. Elemental analysis confirmed the presence of beta-Ga2O3 , thereby supporting the XRD and UV-vis results. This study demonstrates that GNP-activated TNT arrays could be used as photoanode for enhanced photocatalytic activity in the PEC cell.