Enhancing photoelectrochemical hydrogen production over Cu and Ni doped titania thin film: Effect of calcination duration

Bashiri, Robabeh; Mohamed, Norani Muti; Kait, Chong Fai; Sufian, Suriati; Khatani, Mehboob

doi:10.1016/j.jece.2017.06.027

Cited by 25 publications

(8 citation statements)

References 34 publications

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“…Although uncalcined TiO 2 NTs exhibits anatase phase, its photocatalytic activity was lower (46%) than the calcined samples. Nevertheless, the HCHO removal efficiency in the current study is higher as compared to a previous study, where they only removed 40% of HCHO from air using TiO 2 immobilized on a low melting point polymer (TiO 2 @LMPET) [51].…”

Section: Photocatalytic Activitycontrasting

confidence: 76%

“…The major peaks of O1s with BE regions of 530.8-530.0 eV refer to Ti 4+ -O in TiO 2 [37,50]. The rest of the two peaks at BE region 532.1-531.2 eV and 533.7-532.2 eV were associated with adsorbed oxygen and OH group, respectively [51,52]. It was reported that the OH group gradually decreased by increasing the calcination temperature, which was suggested due to the chemical reaction that took place on the surface of TiO 2 during the heat treatment process, as shown in Equation 11 The shift in the position of Ti2p3/2 and Ti2p1/2 peaks indicated the influence of calcination temperature on the electronic state of the Ti element; most probably, the Ti 4+ is reduced partially due to the loss of oxygen as the heat treatment temperature was increased from 350 to 550 °C [47].…”

Section: Xps Analysismentioning

confidence: 96%

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Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

et al. 2020

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In this study, a series of TiO2 nanotubes (NTs) were synthesized employing electrochemical anodization of titanium foil in an ionic liquid solution containing a mixture of glycerol and choline chloride, acting as electrolyte. The as-synthesized TiO2 NTs were calcined at 350, 450, or 550 °C for a 2 h duration to investigate the influence of calcination temperature on NTs formation, morphology, surface properties, crystallinity, and subsequent photocatalytic activity for visible light photodegradation of gaseous formaldehyde (HCHO). Results showed that the calcination temperature has a significant effect on the structure and coverage of TiO2 NTs on the surface. Freshly synthesized TiO2 NTs showed better-ordered structure compared to calcined samples. There was significant pore rupture with increasing calcination temperature. The transformation from anatase to rutile phase appeared after calcination at 450 °C and the weight fraction of the rutile phase increased from 19% to 36% upon increasing the calcination temperature to 550 °C. The band gaps of the TiO2 NTs were in the range from 2.80 to 2.74 eV, shifting the active region of the materials to visible light. The presence of mixed anatase–rutile TiO2 phases in the sample calcined at 450 °C showed enhanced photoactivity, which was confirmed by the 21.56 mg∙L−1∙g−1 removal of gaseous formaldehyde under 120 min of visible light irradiation and displayed enhanced quantum yield, ∅HCHO of 17%.

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Section: Photocatalytic Activitycontrasting

confidence: 76%

Section: Xps Analysismentioning

confidence: 96%

Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

et al. 2020

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“…TiO 2 is typically the n-type photocatalyst due to oxygen deficiency. Anatase (tetragonal, a = b = 3.782 Å, c = 9.502 Å), rutile (tetragonal, a = b = 4.584 Å, c = 2.953 Å), and brookite (rhombohedral, a = 5.436 Å, b = 9.166 Å, c = 5.135 Å) are three different crystalline polymorphs of TiO 2 [4]. Figure 1a-c shows that all these phases are constructed by connecting Ti─O octahedrons through a variable number of shared corners, and/or faces.…”

Section: Crystal Structure and Properties Of 1d-tio 2 Nanostructurementioning

confidence: 99%

“…In the photocatalysis process, light energy greater than the bandgap energy is required to transfer photoexcited electrons to the conduction band of semiconductors. Figure 2 shows that the absorption of photons with enough energy (λ ≤ 390 nm for anatase TiO 2 ) transfer photoexcited electron to the conduction band ( e ¯ CB ) and leave a positive hole behind in the valence band ( h VB + ) [4,11]. Many parameters such as size, specific surface area, pore volume, pore structure, crystalline phase, and the exposed surface facets can significantly influence the photocatalytic performance of TiO 2 [2,10].…”

Section: Figure 1amentioning

confidence: 99%

One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices

Mohammed¹,

Bashiri²,

Sufian³

et al. 2018

Titanium Dioxide - Material for a Sustainable Environment

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One-dimensional (1D) TiO 2 nanostructures (e.g., nanotubes, nanobelts, nanowires, and nanorods) have been considered to be very attractive candidates for various applications including photocatalytic degradation of pollutants, photocatalytic CO 2 reduction into energy fuels, water splitting, solar cells, supercapacitors, and lithium-ion batteries. More importantly, the dimensionality associated with zero-dimensional TiO 2 nanostructures gives unique physical properties, including a high aspect ratio structure, chemical stability, excellent electronic or ionic charge transfer, and a specific interface effect. This chapter elaborates on crystal structure and properties, preparation techniques, strategies for improving photocatalytic activity of 1D-TiO 2 nanostructure and its applications. Amongst all preparation techniques, the influence of experimental parameters on morphologies of 1D-TiO 2 nanostructure using hydro/solvothermal method is extensively explained. Furthermore, some critical engineering strategies to enhance the properties of 1D-TiO 2 nanostructures like increasing the surface area, extending the light absorption, and efficient separation of electrons/holes that advantage their potential applications are described. Moreover, a brief summary of their environmental and energy applications is provided.

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“…Figure 4d displays the high-resolution spectrum Cu 2p of 1%Cu-TiO 2 .It is observed that the peaks for Cu 2+ are located at 933.4 and 952.3 eV and the peak for Cu + is located at 957.8 eV. The peak at 943.7 eV is related to the shock peak of CuO[29,30].…”

mentioning

confidence: 94%

Preparation and characterization of Cu-doped TiO2 nanomaterials with anatase/rutile/brookite triphasic structure and their photocatalytic activity

Zhu

Zhou

Xia

et al. 2021

J Mater Sci: Mater Electron

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Pure TiO 2 and different concentrations of Cu-doped TiO 2 with anatase/rutile/brookite triphasic structure were successfully synthesized through a simple hydrothermal process and characterized by X-ray diffraction (XRD), Raman, scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), diffuse re ectance spectra (DRS), photoluminescence spectra (PL) and Brunauer-Emmett-Teller surface area (BET). Both pure and Cu-doped TiO 2 show relatively high photocatalytic activity owing to their considerable surface areas. Moreover, the three-phase coexisting structure and the conversion between Cu 2+ and Cu + ions facilitate the separation of photogenerated electrons and holes, which is favorable for photocatalytic performance. 1%Cu-TiO 2 exhibits the highest photocatalytic activity and the degradation degree of rhodamine B (RhB) reaches 93.5% after 30 min, which is higher than that of monophasic/biphasic 1%Cu-TiO 2 . •O 2 − radical is the main active specie, and h + and •OH are subsidiary in the degradation process.

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Enhancing photoelectrochemical hydrogen production over Cu and Ni doped titania thin film: Effect of calcination duration

Cited by 25 publications

References 34 publications

Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices

Preparation and characterization of Cu-doped TiO2 nanomaterials with anatase/rutile/brookite triphasic structure and their photocatalytic activity

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