Control of interface between anatase TiO2 nanoparticles and rutile TiO2 nanorods for efficient photocatalytic H2 generation

Xia, Xiaohong; Peng, Shuai; Yue, Baozeng; Wang, Yu; Lei, Binglong; Wang, Zhuo; Huang, Zhongbing; Gao, Yun

doi:10.1016/j.jpowsour.2017.11.067

Cited by 50 publications

(18 citation statements)

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“…Over the last decade, titania has undergone remarkable transformations in its shape and structure. Indeed, today titania may be found in the form of nanowires, nanofilms, nanoribbons, nanosheets, nanorods, and many others.…”

Section: Introductionmentioning

confidence: 99%

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Ameur

Bachir

2020

ChemistrySelect

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This paper represents a general study of titanate nanotubes (TiNTs) which are among the most important materials in the field of catalysis. This research work covers more than 100 publications about the formulation, characterisation and most recent applications of TiNTs. TiNTs can be prepared by different methods, namely the anodic deposition, sol-gel template synthesis and alkaline hydrothermal treatment. The present study focuses on the preparation of this tubular structure by alkaline treatment, using the latest and most recent processes that have been introduced in this method (stirring, acid nature, annealing temperature, etc). The surface properties, such as the point of zero charge (P.Z.C), acid-base nature and light absorption, of TiNTs are also evoked. In the end, some recent and important TiNTs applications in the field of renewable energies are reported (H 2 production and methanation). In addition, NO reduction, CO oxidation, photocatalysis and organic synthesis are also mentioned. Therefore, it may be said that this paper is a structured study about TiNTs for the purpose of making the reader aware of their importance, understand their synthesis, and know their scope of applications. To conclude, the most important data, acquired through various characterization techniques, are provided.[a] Dr.

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Section: Introductionmentioning

confidence: 99%

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Ameur

Bachir

2020

ChemistrySelect

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“…coatings [8,9]. The most commonly existing crystalline polymorphs of TiO 2 are anatase, rutile and brookite [10][11][12]. Anatase is accepted to be the more active phase of TiO 2 and is preferred by the ceramic industries to fabricate light active antimicrobial indoor building materials such as ceramics, glass, tiles and sanitary surfaces [13,14].…”

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confidence: 99%

“…TiO 2 anatase is mainly fabricated at low calcination temperatures (∼500°C) to prevent the anatase to rutile phase transition (ART) [15][16][17], which produces the less photo-active rutile phase. The photo-activity of anatase arises from its appropriate band edge positions, electron affinity, ionisation potential, and the long lifetime of charge carriers [10,12,18]. Moreover, transient photo-conductance analysis has revealed that the electron-hole recombination phenomena in anatase (101) phase is much slower compared to rutile (110), which is credited in part to the indirect band gap of anatase [11,19].The unit cells of anatase and rutile phases are composed of TiO 6 octahedra with titanium atoms at the centre and oxygen atoms at the vertices [20].…”

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Mo doped TiO₂: impact on oxygen vacancies, anatase phase stability and photocatalytic activity

et al. 2020

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This work outlines an experimental and theoretical investigation of the effect of molybdenum (Mo) doping on the oxygen vacancy formation and photocatalytic activity of TiO 2 . Analytical techniques such as x-ray diffraction (XRD), Raman, x-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) were used to probe the anatase to rutile transition (ART), surface features and optical characteristics of Mo doped TiO 2 (Mo-TiO 2 ). XRD results showed that the ART was effectively impeded by 2 mol% Mo doping up to 750°C, producing 67% anatase and 33% rutile. Moreover, the crystal growth of TiO 2 was affected by Mo doping via its interaction with oxygen vacancies and the Ti-O bond. The formation of Ti-O-Mo and Mo-Ti-O bonds were confirmed by XPS results. Phonon confinement, lattice strain and non-stoichiometric defects were validated through the Raman analysis. DFT results showed that, after substitutional doping of Mo at a Ti site in anatase, the Mo oxidation state is Mo 6+ and empty Mo-s states emerge at the titania conduction band minimum. The empty Mo-d states overlap the anatase conduction band in the DOS plot. A large energy cost, comparable to that computed for pristine anatase, is required to reduce Mo-TiO 2 through oxygen vacancy formation. Mo 5+ and Ti 3+ are present after the oxygen vacancy formation and occupied states due to these reduced cations emerge in the energy gap of the titania host. PL studies revealed that the electron-hole recombination process in Mo-TiO 2 was exceptionally lower than that of TiO 2 anatase and rutile. This was ascribed to introduction of 5s gap states below the CB of TiO 2 by the Mo dopant. Moreover, the photo-generated charge carriers could easily be trapped and localised on the TiO 2 surface by Mo 6+ and Mo 5+ ions to improve the photocatalytic activity. coatings [8,9]. The most commonly existing crystalline polymorphs of TiO 2 are anatase, rutile and brookite [10][11][12]. Anatase is accepted to be the more active phase of TiO 2 and is preferred by the ceramic industries to fabricate light active antimicrobial indoor building materials such as ceramics, glass, tiles and sanitary surfaces [13,14]. This requires thermal stability of the anatase phase under typical ceramic processing conditions. TiO 2 anatase is mainly fabricated at low calcination temperatures (∼500°C) to prevent the anatase to rutile phase transition (ART) [15][16][17], which produces the less photo-active rutile phase. The photo-activity of anatase arises from its appropriate band edge positions, electron affinity, ionisation potential, and the long lifetime of charge carriers [10,12,18]. Moreover, transient photo-conductance analysis has revealed that the electron-hole recombination phenomena in anatase (101) phase is much slower compared to rutile (110), which is credited in part to the indirect band gap of anatase [11,19].The unit cells of anatase and rutile phases are composed of TiO 6 octahedra with titanium atoms at the centre and oxygen atoms at the vertices [20]. Both anatase and rutile have a t...

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“…The peak position and relative intensity of the TiO 2 phases were confirmed by comparison with standard JCPDS database. The diffraction peaks located at 2θ = 27.4°, 36.1°, 41.3°, 54.4°, 62.9° and 69.9° corresponds to the (110), (101), (111), (211), (002) and (301) [58][59][60][61] planes of rutile TiO 2 phases (JCPDS no. 076-1939), respectively.…”

Section: Resultsmentioning

confidence: 99%

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

et al. 2019

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Titanium dioxide (TiO 2) is a versatile and inexpensive material for extended applicability in several scientific and technological fields including photo-catalysis for industrial waste treatment, energy harvesting, and hydrogen production. In this work, we report the synthesis of TiO 2 thin film using hydrothermal method and investigations on the influence of reaction time and annealing temperature on growth mechanism of the TiO 2 nanorods. The synthesized TiO 2 films were studied by using UV-visible spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope and energy-dispersive X-ray spectroscopy (EDS). The XRD and Raman measurements revealed the formation of defect free and pure tetragonal TiO 2 rutile phase. The TiO 2 thin films show absorption band edge at around 420 nm in the UVvisible spectrum and exhibit direct band gap value of 2.9 eV. The TiO 2 nanorods are demonstrated to grow randomly on the FTO substrate with changing reaction times but grow uniformly in a flower-like pattern with increasing annealing temperature. Investigation of the field emission properties of TiO 2 thin films (tested as field-emitter array) estimates the turn-on and threshold field at 4.06 and 7.06 V/µm at 10 and 100 µA/cm 2 , respectively.

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Control of interface between anatase TiO2 nanoparticles and rutile TiO2 nanorods for efficient photocatalytic H2 generation

Cited by 50 publications

References 46 publications

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Mo doped TiO₂: impact on oxygen vacancies, anatase phase stability and photocatalytic activity

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

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Control of interface between anatase TiO2 nanoparticles and rutile TiO2 nanorods for efficient photocatalytic H2 generation

Cited by 50 publications

References 46 publications

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Mo doped TiO2: impact on oxygen vacancies, anatase phase stability and photocatalytic activity

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

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Mo doped TiO₂: impact on oxygen vacancies, anatase phase stability and photocatalytic activity