Water-splitting properties of bi-phased TiO2 nanotube arrays subjected to high-temperature annealing

Chahrour, Khaled M.; Yam, F.K.; Eid, Ahmed H.

doi:10.1016/j.ceramint.2020.05.246

Cited by 38 publications

(4 citation statements)

References 56 publications

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“…The observed value of 3.25 eV for the ZnO lm agrees with the literature values of 3.17-3.30 eV [6,16,30]. The recorded E g value of 3.21 eV for the TiO 2 lm, which was prepared by anodization and annealed at 400 , t well with the published value of 3.20 eV for anatase phase TiO 2 [24,31,32]. The estimated value of 1.23 eV for the c-Si sample is found to be not far from the value of 1.12 eV reported by other workers [33][34][35].…”

Section: (D) and 5(d))supporting

confidence: 90%

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Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

Jubu,

Obaseki,

Ajayi

et al. 2024

J Opt

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The optical diffuse re ectance data of a semiconductor material is usually converted into the Kubelka-Munk function before proceeding to process the conventional Tauc's plot from which optical bandgap energy can be determined. Firstly, it is conventional/ customary to convert the percentage re ectance (R ∞ (%)) data which is obtained from UV-vis measurement into an equivalent re ectance (R ∞ ) that range between 0 and 1 before processing the Tauc's plot. Secondly, the Kubelka-Munk function is usually multiplied by the incident photon energy, hv, to produce an all-elements/ comprehensive Tauc's plot. Literature is scarce to convincingly demonstrate that a correct bandgap value can also be obtained from the Tauc's plot that is derived directly from the (R ∞ (%)) data without having to convert to R ∞ . Also, publication is rarely available to demonstrate that a correct bandgap value can be determined without having to multiply the Kubelka-Munk function by hv. Investigation shows diminutive differences in the bandgap values estimated from the R ∞ (%)-based Tauc's plots and the equivalent R ∞ -based Tauc's plots. This suggests that either of the methods can be employed for a proper bandgap estimate. Additionally, a comparison between the magnitude of the bandgap energies determined from the comprehensive Tauc's plot and when the Kubelka-Munk function is not multiplied by shows insigni cant differences in the estimated values. This suggests that either of the two methods can be used to obtain a reliable bandgap for direct and indirect optical gap semiconductors.

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Section: (D) and 5(d))supporting

confidence: 90%

“…The synthesized TiO 2 lm was washed with DI water and dried using a N 2 gun. The produced amorphous TiO 2 lm was annealed in a HTF at 400°C under a supply of water vapour/N 2 for 3 h [10,24]. The water vapour was supplied as an oxygen source for oxidation of the lm [10].…”

Section: Synthesis Of Tio 2 Lmmentioning

confidence: 99%

Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

Jubu,

Obaseki,

Ajayi

et al. 2024

J Opt

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“…5(b). Rct is the charge transfer resistance at the electrode-electrolyte interface, Rs represent the solution resistance, Ri is the charge recombination resistance, CPE-1 and CPE-2 are the constant phase elements that represent the bulk capacitance from the surface electrode to the electrolyte and the surface states [3,39]. The Rct is found to be 141.7 Ω.…”

Section: Impedance Spectroscopymentioning

confidence: 99%

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

Jubu

Yusuf

Yusof

et al. 2023

Preprint

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The present work reports the photocatalytic properties of pyrolyzed molybdenum oxide thin film. Microstructural analysis reveals clustered nanoaggregates. Structural analysis shows polycrystalline 𝛼-MoO3 phase. The crystallite size, dislocation density, microstrain and stacking faults are found to be 41.27 nm, 5.87 ×10−4 lines/cm2, 8.41 ×10−4 and 1.78, respectively. The optical bandgap is found to be 3.20 eV. Linear sweep voltammetry measurement in 1 M KOH electrolyte reveal significant photocurrent density of 992.39 𝜇A/cm2 at bias of 1 V vs. Ag/AgCl. The reasonable performance of the device suggest that the spray pyrolysis method is promising for preparing photosensitive MoO3 films for photoelectrochemical measurement.

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“…33,34 In addition, its vertically aligned arrays of nanotubes expedite the absorption of catalysts onto the external walls of TiO 2 nanotubes and promote the rate of electron conduction. 35,36 In particular, anodic titania TiO 2 -based hybrid nanomaterials for potential biosensor requests have been investigated considerably. Based on its unique characteristics, significant efforts have been made to incorporate MO/transition metal/ rGO nanocomposite into anodic titania (TiO 2 ) nanotube-based hybrid nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

CuO/Cu/rGO nanocomposite anodic titania nanotubes for boosted non-enzymatic glucose biosensors

et al. 2023

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Water-splitting properties of bi-phased TiO2 nanotube arrays subjected to high-temperature annealing

Cited by 38 publications

References 56 publications

Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

CuO/Cu/rGO nanocomposite anodic titania nanotubes for boosted non-enzymatic glucose biosensors

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