Improvement the wastewater purification by TiO2 nanotube arrays: The effect of etching-step on the photo-generated charge carriers and photocatalytic activity of anodic TiO2 nanotubes

Pasikhani, Javad Vahabzadeh; Gilani, Neda; Pirbazari, Azadeh Ebrahimian

doi:10.1016/j.solidstatesciences.2018.08.003

Cited by 31 publications

(12 citation statements)

References 41 publications

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“…It can be explained by the formation of the caps over the NTs which may partly reflect incident radiation, or by the elevated number of oxygen vacancies created by the laser. [ 35 ] From the reflectance spectra, the Kubelka‐Munk plots were calculated (Figure S5, Supporting Information), and the energy bandgap ( E bg ) values were estimated for reference, nickel sputtered sample, and specimen irradiated with 10 mJ cm −2 . The E bg of pristine titania NTs equals 3.09 eV, less than reported for bulk anatase (3.20 eV), [ 36 ] due to optimization of the spacing and geometrical features of the nanotubes.…”

Section: Figurementioning

confidence: 99%

Spectacular Oxygen Evolution Reaction Enhancement through Laser Processing of the Nickel‐Decorated Titania Nanotubes

Wawrzyniak

Karczewski

Coy

et al. 2020

Adv Materials Inter

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The selective, laser‐induced modification of the nickel‐decorated titania nanotubes provides remarkable enhancement toward oxygen evolution reaction. Particularly, the irradiation of the laterally spaced crystalline TiO2 nanotubes, results in the formation of the tight closure over irradiated end, preserving their hollow interior. The shape of the absorbance spectra is modulated along with applied energy, and the new absorption band appears at 500 nm, where the local minimum can be found for bare nanotubes. The high‐resolution X‐ray photoelectron spectra indicate the presence of both metallic and hydroxide forms of nickel species. The electrode material treated with 355 nm pulses at 50 mJ cm−2 shows significantly improved current densities in the anodic regime, reaching nearly 300 mA cm−2 while exposed to solar radiation, whereas the untreated sample barely comes to 1.5 mA cm−2 in the same conditions. The tailored titania photoanode also exhibits two orders of magnitude higher donor concentration in comparison to the primary substrate as verified by Mott–Schottky analysis. The electrochemical analysis confirms the key role of laser annealing in enhancing the effectiveness of light‐driven water splitting.

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Section: Figurementioning

confidence: 99%

Spectacular Oxygen Evolution Reaction Enhancement through Laser Processing of the Nickel‐Decorated Titania Nanotubes

Wawrzyniak

Karczewski

Coy

et al. 2020

Adv Materials Inter

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“…The hydrogen production efficiency (photoconversion efficiency) of the prepared samples is determined by the following equation [17]:…”

Section: Fig 3 Linear-sweep Voltammograms Measured From Tio2 Nanoromentioning

confidence: 99%

“…Recent research demonstrates that the addition of electron donor molecules or in the other words sacrificial reagents is an effective approach to enhance the hydrogen generation rate in photoelectrocatalytic systems [16]. Sacrificial agents by capturing the active spices, i.e., photo-generated holes, inhibit the electron-hole pair recombination as well as prevent backward reaction producing H2O [17]. In addition, sacrificial agents by contributing their hydrogen atoms can increase hydrogen generation rate [18].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrocatalytic Performance of TiO<sub>2</sub> Nanorods in Photoelectrochemical Water Splitting Cell by Using an Alcoholic Sacrificial Agent

Hariri¹,

Gilani²,

Pasikhani³

2019

Preprint

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Photoelectrocatalytic water splitting by using various TiO2 nanostructures is a promising approach to generate hydrogen without harmful byproducts. However, their effective performance is restricted by some drawbacks such as high rapid electron-hole pair recombination and backward reaction producing H2O. Thus in this study, the probability of enhancing hydrogen generation rate by adding methanol as a sacrificial agent to the anodic chamber of a two-compartment photoelectrochemical cell is investigated. Herein, one-dimensional elongated TiO2 nanorods that were fabricated via a facile one-pot hydrothermal method are utilized as potent photoanode. Voltammetric characterizations confirm that addition of alcoholic sacrificial agent has a significant effect on photoelectrochemical properties of TiO2 nanorods which by adding 10 wt% of methanol, the photocurrent density and photoconversion efficiency increased from 0.8mA.cm-2 to 1.5mA.cm-2 and from 0.28% to 0.45%, respectively. The results of photoelectrocatalytic water splitting indicated that the hydrogen generation rate in the presence of methanol was about 1.2 times higher than that from pure water splitting. These enhancements can be attributed to the key role of methanol. Methanol molecules not only inhibit the electron-hole pair recombination but also accelerate the hydrogen generation rate by sharing their hydrogen atoms.

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“…Moreover, we provide an example of modification with created colloid, using it to enhance the efficiency of oxygen production in the TiO 2 -based electrode by over an order of magnitude. Due to the easily adjustable TiO 2 nanotubes (NTs) morphology, facile production, high surface area, and stability [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ], together with nickel nanoparticles, they have become a very strong, yet eco-friendly, duet for further research. The electrochemical properties of hybrids composed of Ni nanoparticles electrodeposited onto titania nanotubes were shown for example by Chen et al using nickel sulphate as NPs precursor [ 40 ].…”

Section: Introductionmentioning

confidence: 99%

Laser-Assisted Synthesis and Oxygen Generation of Nickel Nanoparticles

et al. 2020

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Nowadays, more than ever, environmental awareness is being taken into account when it comes to the design of novel materials. Herein, the pathway to the creation of a colloid of spherical, almost purely metallic nickel nanoparticles (NPs) through pulsed laser ablation in ethanol is presented. A complex description of the colloid is provided through UV-vis spectroscopy and dynamic light scattering analysis, ensuring insight into laser-induced nanoparticle homogenization and size-control of the NPs. The transmission electron spectroscopy revealed spherical nanoparticles with a narrow size distribution, whereas the energy-dispersive X-ray spectroscopy accompanied by the X-ray photoelectron spectroscopy revealed their metallic nature. Furthermore, an example of the application of the colloidal nanoparticles is presented, where a quick, five-min ultrasound modification results in over an order of magnitude higher current densities in the titania-based electrode for the oxygen evolution reaction.

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Improvement the wastewater purification by TiO2 nanotube arrays: The effect of etching-step on the photo-generated charge carriers and photocatalytic activity of anodic TiO2 nanotubes

Cited by 31 publications

References 41 publications

Spectacular Oxygen Evolution Reaction Enhancement through Laser Processing of the Nickel‐Decorated Titania Nanotubes

Spectacular Oxygen Evolution Reaction Enhancement through Laser Processing of the Nickel‐Decorated Titania Nanotubes

Enhanced Photoelectrocatalytic Performance of TiO<sub>2</sub> Nanorods in Photoelectrochemical Water Splitting Cell by Using an Alcoholic Sacrificial Agent

Laser-Assisted Synthesis and Oxygen Generation of Nickel Nanoparticles

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