Structures and properties of N-doped TiO2 nanotubes arrays synthesized by the anodization method for hydrogen production

Kodtharin, N.; Vongwatthaporn, Rinnatha; Nutariya, Jeerapat; Sricheewin, Chanun; Timah, Emmanuel Nyambod; Sivalertporn, Kanchana; Thumthan, Orathai; Tipparach, Udom

doi:10.1016/j.matpr.2018.02.068

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Considering the cost and resources of the catalyst, many scholars focused on nonmetal-modified TiO 2 catalysts. Kodtharin 25 prepared N-doped TiO 2 nanotube catalysts using the anodization method and conducted hydrogen production experiments. It was found that N doping in TiO 2 nanotubes decreased the optical band gap energy and increased the photoactivity.…”

Section: Introductionmentioning

confidence: 99%

Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

et al. 2021

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Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH 3 BH 3 , AB), a reduced graphene oxide (rGO)-modified TiO 2 photocatalyst was proposed for hydrogen production. In this study, rGO/TiO 2 photocatalysts with different rGO contents were prepared and characterized by XRD, UV−vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO 2 , and the band gap energy of rGO/TiO 2 varies with the content of rGO, and 1% rGO/TiO 2 has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO 2 by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO 2 , rGO/TiO 2 shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO 2 photocatalysts with different contents of rGO, 1% rGO/TiO 2 shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol•min −1 •g −1 . Furthermore, the catalyst 1% rGO/TiO 2 shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.

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Section: Introductionmentioning

confidence: 99%

Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

et al. 2021

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“…According to Ref. [22,[36][37][38][39][40][41][42][43] and our theoretical computation, both I-N and S-N in the lattice of TO 2 will produce energy levels within the BG. Meanwhile, oxygen vacancies and Ti 3+ are formed during ion implantation which also creates energy levels in the band gap, because the nitrogen doping induces a substantial reduction of the formation energy of Ti 3+ and oxygen vacancies in TiO 2 .…”

Section: -5mentioning

confidence: 78%

Experimental and computational study of visible light-induced photocatalytic ability of nitrogen ions-implanted TiO₂ nanotubes*

et al. 2020

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Nitrogen-doped TiO2 nanotubes (TNTs) were prepared by ion implantation and anodic oxidation. The prepared samples were applied in photocatalytic (PC) oxidation of methyl blue, rhodamine B, and bisphenol A under light irradiation. To explore the influence of doped ions on the band and electronic structure of TiO2, computer simulations were performed using the VASP code implementing spin-polarized density functional theory (DFT). Both substitutional and interstitial nitrogen atoms were considered. The experimental and computational results propose that the electronic structure of TiO2 was modified because of the emergence of impurity states in the band gap by introducing nitrogen into the lattice, leading to the absorption of visible light. The synergy effects of tubular structures and doped nitrogen ions were responsible for highly efficient and stable PC activities induced by visible and ultraviolet (UV) light.

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“…When these atoms are doped into TiO 2 , they create mid-band gap levels between the conduction band and valance band. These impurity levels resulting in a decrease in band gap energy [4,45].…”

Section: Samplementioning

confidence: 99%

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

Emran

Alanazi

2021

Journal of Experimental Nanoscience

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Self-organized anodic double layer TiO 2 nanotube arrays (TNTAs) were sensitized by an electrochemical anodization process on a Ti sheet with a two-step anodization method. The prepared sample, followed by hydrothermal treatment with Nd(NO 3 ) 3 and/or Gd(NO 3 ) 3 and/or PtCl 4 solution at 180 C for 2 h, produced Nd-Pt-TNTAs, Gd-Pt-TNTAs, Nd-Gd-Pt-TNTAs and Pt-TNTAs. The morphological and structural properties were studied by SEM, XRD and Raman spectra techniques. The hydrogen evolution reaction (HER) performance on Lanthanides-Pt-TNTAs was investigated using the Tafel linear polarization technique. The calculated values of the activation energy are in good agreement with the trend in catalytic activity. The excellent performance of doped TNTAs with low activation energy (E a ) is due to the formation of an excitation energy level below the conduction band of TiO 2 from the binding of electrons with oxygen vacancies decreasing the excitation energy resulting in robust electrocatalytic activity. The very low value of E a for Nd-Gd-Pt-TNTAs (2.02 kJ/mol) compared to other electrochemical catalysts used for hydrogen evolution reactions containing titanium nanotubes was achieved for the first time. This makes the Lanthanides -Pt-TNTAs prepared in the present work optimal catalysts for electrodes and promising for applications in fuel cells or as water splitting materials. HIGHLIGHTSSynthesis of self-organized anodic double layer TiO 2 nanotube arrays (TNTAs) on a Ti sheet with a two-step anodization method. Nd, Gd, Pt were deposited on anodic TNTAs arrays by hydrothermal method. The HER mechanisms on Lanthanides-Pt-TNTAs in acidic media has been discussed. The order of catalytic activity based on the values of activation energy was Nd-Gd-Pt-TNTAs > Gd-Pt-TNTAs > Nd-Pt-TNTAs > Pt-TNTAs > undoped TNTAs.

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Structures and properties of N-doped TiO2 nanotubes arrays synthesized by the anodization method for hydrogen production

Cited by 7 publications

References 16 publications

Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Experimental and computational study of visible light-induced photocatalytic ability of nitrogen ions-implanted TiO₂ nanotubes*

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

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Structures and properties of N-doped TiO2 nanotubes arrays synthesized by the anodization method for hydrogen production

Cited by 7 publications

References 16 publications

Efficient Hydrogen Production by an rGO/TiO2 Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Efficient Hydrogen Production by an rGO/TiO2 Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Experimental and computational study of visible light-induced photocatalytic ability of nitrogen ions-implanted TiO2 nanotubes*

Double layer lanthanide –Pt/TiO2 nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

Contact Info

Product

Resources

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Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Efficient Hydrogen Production by an rGO/TiO₂ Composite Material from Ammonia Borane Hydrolysis in a Photocatalytic Reactor

Experimental and computational study of visible light-induced photocatalytic ability of nitrogen ions-implanted TiO₂ nanotubes*

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media