Synthesis and properties of titanium glycolate Ti(OCH2CH2O)2

Красильников, В. Н.; Shtin, A. P.; Гырдасова, О. И.; Polyakov, E. V.; Швейкин, Г. П.

doi:10.1134/s0036023608070152

Cited by 21 publications

(15 citation statements)

References 18 publications

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“…Earlier it was shown that the morphology and sizes of crystals of titanium glycolate used as a precursor of pure and doped anatase depend essentially on the conditions of their formation [32][33][34][35][36][37][38][39][40]. An important feature of Ti(OCH 2 CH 2 ) 2 as a precursor is the ability of its crystals to undergo a pseudomorphic transformation into thermolysis product aggregates during heating in air and in inert gaseous medium.…”

Section: Resultsmentioning

confidence: 99%

“…The possibility of synthesis of nanodispersed solid solutions TiO 2-y C y , Ti 1-x V x O 2-y C y and nanocomposites TiO 2-y C y :nC, Ti 1-x V x O 2-y C y :nC with extended shape of aggregates has been demonstrated in Refs. [32][33][34][35]. By varying the precursor composition, its synthesis and heat thermal treatment conditions, it is possible to modify the morphology, aggregate microstructure and defect structure of synthesized photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

“…One of the main aims of this work was to produce the solid solutions TiO 2-x C x and composites TiO 2-x C x :nC with spherical shape of aggregates and to examine their optical and photocatalytic properties by means of modern experimental and theoretical methods. The samples were synthesized by the developed precursor technique from titanium glycolate Ti(OCH 2 CH 2 O) 2 used as a precursor taking into consideration the familiar ability of the crystals of this compound to undergo a pseudomorphic transformation into aggregates TiO 2-x C x :nC and TiO 2 during heating [32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

et al. 2015

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Carbon-doped anatase with spherical shape of aggregates has been synthesized by the developed precursor technique with the use of Ti(OCH 2 CH 2 ) 2 as a precursor. The synthesized samples of the general composition TiO 2-y C y :nC with different carbon content have been tested for the photocatalytic activity in the oxidation reaction of water-dissolved hydroquinone during irradiation in ultraviolet and visible light. It was shown that the optical and photocatalytic properties of TiO 2-y C y :nC depend strongly on the concentration of carbon. The first-principles calculations of the electronic band structure and optical absorption spectra have been carried out. The probabilities of formation of carbon for oxygen substitutional defects and interstitial defects (implantation of carbon atoms into interstitial sites) have been analyzed. The calculations performed allowed us to determine the dominating type of defects responsible for absorption and photocatalytic activity of carbon-doped anatase in the visible spectral region.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

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“…In some works including our studies, it was shown that during heating these compounds turn into oxides inheriting the shape of the precursor particles and crystals [55][56][57]. We studied preliminarily which shapes of particles various zinc glicolate complexes can have and under which synthesis conditions these complexes are formed [27].…”

Section: Synthesis and Characterization Of Precursor Organometallic Cmentioning

confidence: 98%

“…Few techniques allow obtaining polycrystalline quasi-one-dimensional ZnO [52][53][54]. We shall consider the possibilities of the precursor method worked out by the authors [55,56] for the synthesis of quasi-one-dimensional nanostructured aggregates ZnO and Zn-O-C. Using transmission electron microscopy (TEM), Raman spectroscopy, and EPR spectroscopy methods, we shall demonstrate that the aggregates Zn-O-C have either a ZnOC:nC composite or a C-doped ZnO single-phase structure depending on heat treatment conditions and that all the aggregates exhibit a tubular morphology and a nanocrystalline structure with a high specific surface area and a high concentration of singly charged oxygen vacancies.…”

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Structural, Optical, and Photocatalytic Properties of Quasi-One-Dimensional Nanocrystalline ZnO, ZnOC:nC Composites, and C-doped ZnO

Шалаева

Гырдасова

Красильников

et al. 2014

Springer Proceedings in Physics

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Zinc oxide with a wurtzite structure belongs to a group of advanced functional materials because it possesses a unique set of properties. Its most important property is high photocatalytic activity in low-temperature oxidation reactions of toxic and colored organic compounds dissolved in water [1][2][3][4][5][6]. The action of oxide semiconductor photocatalysts is based on the generation of free carriers (electrons and holes) under exciting radiation, which take part in redox reactions on the oxide surface [7]. The photocatalytic activity can be increased first of all by creating a high specific surface area and a high concentration of native structural defects, which raises the specific concentration of sorption and oxidation centers on the catalyst surface [8][9][10]. There are numerous original researches and reviews devoted to various synthesis methods of nanosized ZnO materials having a high specific surface area [11][12][13][14][15][16][17]. Another way for improving the photocatalytic properties of wide-bandgap semiconductors is modification of the electron-energy spectrum of oxides. The results of first-principle quantum chemical calculations show that restructuring of the electron-energy spectrum and reduction of the optical gap can occur owing to native structural defects such as oxygen vacancies of . The effects of electron-energy-spectrum restructuring and photocatalytic activity enhancement induced by oxygen vacancies have been confirmed experimentally for nanostructured ZnO [20]. Reduction of recombination processes of generated electron-hole pairs also increases the photocatalytic activity [7]. The combination of the above methods for improving the photocatalytic activity seems promising for the development of ZnO-based photocatalysts. Nobel metal/ZnO nanocomposites exhibit very high cat-E. V. Shalaeva ( ) · O. I. Gyrdasova · V. N. Krasilnikov · M. A. Melkozerova · I.

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Focusing on Relevant Features Governing the Electrochemical Behavior of Li_(4‐x)/3Ti_(5‐2x)/3Cr_xO₄ Electrode Material

et al. 2018

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Two sets of the spinel‐type compounds Li(4‐x)/3Ti(5‐2x)/3CrxO4 (LTCO) with x=0, 0.1, and 0.2 were prepared from two synthetic strategies implying different precursors (freshly obtained titanium glycolate and amorphous hydrated titanium oxide). These routes allowed to synthesize samples with high purity (for x=0.2) and significant different microstructure. Structural and compositional characterization revealed the existence of an atomic percentage of 0.08 Cr6+ cations at the tetrahedral sites of the spinel‐type structure. Concomitantly, the corresponding amount of Ti3+ cations is stabilized. The electrochemical response is evaluated in LTCO‐composites materials fabricated with environmentally friendly sodium alginate as a binder. The phase with x=0.2 prepared from the glycolate precursor at a temperature as low as 600 °C shows good electrochemical performance. Thus, capacity values greater than 200 mA h g−1 at 0.5C are related to an increase in the value of lithium‐ion diffusion coefficient (ca. 2.67×10−12 cm2 s−1, as estimated from electrochemical impedance spectroscopy, EIS). Furthermore, when this electrode is cycled at high density current rates (2C), discharge capacity values of ∼125 mA h g−1 are obtained, which means a retention of 63 and 52 % in the cycles 700th and 1000th, respectively. The remarkable electrochemical response displayed is interpreted considering different concurrent features: an appropriate microstructure, an aqueous binder, and the stabilization of mixed‐valent titanium (Ti4+/Ti3+) and chromium (Cr6+/Cr3+) cations at the surface.

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Synthesis and properties of titanium glycolate Ti(OCH2CH2O)2

Cited by 21 publications

References 18 publications

Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

Structural, Optical, and Photocatalytic Properties of Quasi-One-Dimensional Nanocrystalline ZnO, ZnOC:nC Composites, and C-doped ZnO

Focusing on Relevant Features Governing the Electrochemical Behavior of Li_(4‐x)/3Ti_(5‐2x)/3Cr_xO₄ Electrode Material

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Synthesis and properties of titanium glycolate Ti(OCH2CH2O)2

Cited by 21 publications

References 18 publications

Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

Structural, Optical, and Photocatalytic Properties of Quasi-One-Dimensional Nanocrystalline ZnO, ZnOC:nC Composites, and C-doped ZnO

Focusing on Relevant Features Governing the Electrochemical Behavior of Li(4‐x)/3Ti(5‐2x)/3CrxO4 Electrode Material

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Focusing on Relevant Features Governing the Electrochemical Behavior of Li_(4‐x)/3Ti_(5‐2x)/3Cr_xO₄ Electrode Material