Tuning the carrier density of TiO2 nanotube arrays by controlling the oxygen vacancies for improved areal capacitance in supercapacitor applications

Raj, C. Clement; Srimurugan, V.; A, Flamina; Prasanth, R.

doi:10.1016/j.matchemphys.2020.122925

Cited by 30 publications

(6 citation statements)

References 47 publications

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“…The photo-generated electrons were easily trapped by the oxygen vacancies, resulting in a low recombination rate with holes. Consequently, the electrons lived longer and reduced the amount of oxygen assimilated from the surface of the UV-treated TiO 2 film and created superoxide radicals ( • O 2 − ), which are potent oxidizers of methylene-blue-dye molecules [ 40 , 41 ]. Meanwhile, photo-generated holes also spread out to the surface of the UV-treated TiO 2 film and further oxidized any surface-assimilated methylene-blue dye.…”

Section: Resultsmentioning

confidence: 99%

“…Two peaks were identified in the spectra of the untreated sample, as shown in Figure 4 c, and they were attributed to Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 components. The components were located at binding energies of 458.12 and 463.74 eV, respectively [ 41 ]. The energy difference obtained for the doublet components for the untreated TiO 2 sample was 5.7 eV, which shows the presence of an anatase phase in the TiO 2 sample [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

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Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Alyami

2023

Nanomaterials

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This work reports the fabrication of titanium dioxide (TiO2) nanoparticle (NPs) films using a scalable drop-casting method followed by ultra-violet (UV) irradiation for creating defective oxygen vacancies on the surface of a fabricated TiO2 semiconductor film using an UV lamp with a wavelength oof 255 nm for 3 h. The success of the use of the proposed scalable strategy to fabricate oxygen-vacancy-rich TiO2 films was assessed through UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Ti 2p XPS spectra acquired from the UV-treated sample showed the presence of additional Ti3+ ions compared with the untreated sample, which contained only Ti4+ ions. The band gap of the untreated TiO2 film was reduced from 3.2 to 2.95 eV after UV exposure due to the created oxygen vacancies, as evident from the presence of Ti3+ ions. Radiation exposure has no significant influence on sample morphology and peak pattern, as revealed by the SEM and XRD analyses, respectively. Furthermore, the photocatalytic activity of the fabricated TiO2 films for methylene-blue-dye removal was found to be 99% for the UV-treated TiO2 films and compared with untreated TiO2 film, which demonstrated only 77% at the same operating conditions under natural-sunlight irradiation. The proposed UV-radiation method of oxygen vacancy has the potential to promote the wider application of photo-catalytic TiO2 semiconductor films under visible-light irradiation for solving many environmental and energy-crisis challenges for many industrial and technological applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Alyami

2023

Nanomaterials

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“…rGO/TiO 2 and MWCNTs/TiO 2 (where MWCNTs are multiwalled carbon nanotubes) electrode materials were synthesized with a hydrothermal method [ 29 ]. The synergetic effect of the rGO/TiO 2 electrode increases the specific capacitance up to 558 F/g at 1 A/g.…”

Section: Introductionmentioning

confidence: 99%

Supercapacitor Properties of rGO-TiO2 Nanocomposite in Two-component Acidic Electrolyte

et al. 2022

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The electrochemical properties of the highly porous reduced graphene oxide/titanium dioxide (rGO/TiO2) nanocomposite were studied to estimate the possibility of using it as a supercapacitor electrode. Granular aerogel rGO/TiO2 was used as an initial material for the first time of manufacturing the electrode. For the aerogel synthesis, industrial TiO2 Hombikat UV100 with a high specific surface area and anatase structure was used, and the aerogel was carried out with hydrazine vapor. Porous structure and hydrophilic–hydrophobic properties of the nanocomposite were studied with a method of standard contact porosimetry. This is important for a supercapacitor containing an aqueous electrolyte. It was found that the hydrophilic specific surface area of the nanocomposite was approximately half of the total surface area. As a result of electrochemical hydrogenation in the region of zero potential according to the scale of a standard hydrogen electrode, a reversible Faraday reaction with high recharge rate (exchange currents) was observed. The characteristic charging time of the indicated Faraday reaction does not exceed several tens of seconds, which makes it possible to consider the use of this pseudocapacitance in the systems of fast energy storage such as hybrid supercapacitors. Sufficiently high limiting pseudo-capacitance (about 1200 C/g TiO2) of the reaction was obtained.

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“…Titanium dioxide nanoparticles (TiO 2 NPs) are one of the most important transition-metal oxides that have been extensively applied for photocatalysts, [1,2] supercapacitors, [3] dye-sensitized solar cells, [4] and biomedicine [5] because of their chemical stability, relatively high photocatalytic activity, nontoxicity, and low cost. As is well known, the performance of TiO 2 is strongly dependent on morphology, size, and crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiO₂ nanoparticles via cathode glow discharge electrolysis and its photocatalytic performance in the degradation of methylene blue

Wang

et al. 2022

Plasma Processes & Polymers

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TiO 2 nanoparticles (NPs) were prepared by cathode glow discharge electrolysis in sodium fluoride solution, in which cetyltrimethyl ammonium bromide (CTAB) acted as a stabilizer, and a Ti foil and a Pt needlepoint served as the anode and the cathode, respectively. The structure, component, and morphology of TiO 2 NPs were characterized. A possible preparation mechanism was proposed. In addition, the photocatalytic performance of TiO 2 NPs was assessed through the degradation of methylene blue (MB). The results showed that TiO 2 NPs with 12.7 nm particle size could be prepared at 500 V discharge voltage. CTAB, as a stabilizer, can diminish the agglomeration. The photocatalytic property of TiO 2 NPs for the degradation of MB with 0.15% CTAB is markedly superior to that of TiO 2 NPs without adding CTAB and commercial TiO 2 NPs (P25). K E Y W O R D S cathode glow discharge electrolysis (CGDE), nanoparticles (NPs), photocatalytic degradation, plasma, titanium dioxide (TiO 2 )

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Tuning the carrier density of TiO2 nanotube arrays by controlling the oxygen vacancies for improved areal capacitance in supercapacitor applications

Cited by 30 publications

References 47 publications

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Supercapacitor Properties of rGO-TiO2 Nanocomposite in Two-component Acidic Electrolyte

Preparation of TiO₂ nanoparticles via cathode glow discharge electrolysis and its photocatalytic performance in the degradation of methylene blue

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Tuning the carrier density of TiO2 nanotube arrays by controlling the oxygen vacancies for improved areal capacitance in supercapacitor applications

Cited by 30 publications

References 47 publications

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Supercapacitor Properties of rGO-TiO2 Nanocomposite in Two-component Acidic Electrolyte

Preparation of TiO2 nanoparticles via cathode glow discharge electrolysis and its photocatalytic performance in the degradation of methylene blue

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Preparation of TiO₂ nanoparticles via cathode glow discharge electrolysis and its photocatalytic performance in the degradation of methylene blue