A Novel Oxidation‐Reduction Route for Layer‐by‐Layer Synthesis of TiO<sub>2</sub> Nanolayers and Investigation of Its Photocatalytical Properties

Semishchenko, K. B.; Tolstoy, Valeri P.; Lobinsky, A.A.

doi:10.1155/2014/632068

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…Transition metal oxides such as NiO, RuO 2 , MnO 2 , Bi 2 O 3 , Co 3 O 4 , Fe 2 O 3 and TiO 2 etc [5][6][7] exhibit high capacitance, but suffer from expensive price, low abundance and poor rate capability [8]. Typically, nanocrystalline Bi 2 O 3 can offer a large surface area, electrochemical stability and pseudo capacitive behavior; it may make a significant contribution to the advancement of supercapacitor technology [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Yang

Lin

2019

Journal of Electrical Engineering

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Reduced graphene oxide/bismuth oxide (rGO/Bi2O3) composites were prepared at various weight ratios of raw materials, GO and bismuth nitrate at 1:0.1, 1:0.3, 1:0.6, 1:0.9 and 1:1.2, respectively, by the improved Hummer’s method. During the process, the mixed solutions were prepared, and then rGO was obtained by hydrothermal method. Finally, the complex of rGO/Bi2O3 was prepared by calcination after hydrothermal treatment. The results show that the removal of oxygen-containing functional groups in rGO are increased with the increase of graphene agglomeration, and the Raman shifts of G band tending to the lowest wave-number. The electrochemical characteristics of the as-prepared rGO/Bi2O3 materials were also examined in 1 M KOH electrolyte. The dominating charge storage mechanisms are attributed to the electric double layer behaviors. As the content of bismuth nitrate increased, the rGO/Bi2O3 had a higher capacitance. The rGO/Bi2O3 obtained from the weight ratio of GO and bismuth nitrate of 1:1.2 as raw materials exhibit a maximum specific capacitance of 216 Fg−1, revealing that rGO/Bi2O3 obtained by hydrothermal synthesis method can be used for the carbon-electrode of a super capacitor.

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Section: Introductionmentioning

confidence: 99%

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Yang

Lin

2019

Journal of Electrical Engineering

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“…Apparently, this value can be explained by the fact that the microtubule wall contains both water-solvent molecules, that did not completely evaporate upon room temperature air-drying, as well as amorphous Fe(OH) 3 hydroxide, which could form at the interface between the solution of FeCl 2 -FeCl 3 salts mixture and gaseous ammonia at the first moment of treatment. Objectively, as it follows from the dependences of solubility logarithms of Fe(II) and Fe(III) hydroxides from the solution pH, calculated by Hydra-Medusa program [25], when the pH is increased in such a solution, precipitation of Fe(OH) 3 is observed on the first stage and then, precipitate of Fe(OH) 2 is formed at a pH of 7.5-12 (Fig. 4).…”

Section: Discussionmentioning

confidence: 99%

The effect of microtube formation with walls, containing Fe3O4 nanoparticles, via gassolution interface technique by hydrolysis of the FeCl2 and FeCl3 mixed solution with gaseous ammonia

Gurenko¹,

Tolstoy²,

Gulina³

2017

Nanosystems: Phys. Chem. Math.

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In this work, microtubes with walls, containing Fe 3 O 4 nanoparticles, obtained by "rolling up" of the interfacial films, were synthesized by the gas-solution interface technique (GSIT), using a mixture of aqueous solutions of FeCl 2 and FeCl 3 and gaseous ammonia. The synthesized microtubes were characterized by Scanning Electronic Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX), X-Ray Diffraction analysis (XRD) and magnetization measurements. It was established that under optimal synthetic conditions the microtube diameter ranged from 5 to 10 µm, the length was up to 120 µm and the thickness of walls was about 0.6 µm, the walls themselves being formed by nanoparticles with a size of about 10 nm. The reversible hysteresis behavior, the low coercive force, the low remanence magnetization and the approaching of Mr/Ms to zero, confirmed the superparamagnetic nature of the synthesized microtubes. A hypothesis on the formation of microtubes by the gas-solution interface technique was proposed.

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“…For the synthesis of metal oxide layers by this method, the obtained layer is most commonly formed by oxidationreduction reactions, e.g. a layer of SnO 2 ·nH 2 O is formed by the interaction of the Sn (II) cations and a slightly alkaline solution of H 2 O 2 [11], a layer of TiO 2 ·nH 2 O -solutions of Ti 2 (SO 4 ) 2 and NaNO 2 [12], the layer of nanoparticles Ag -AgNO 3 solutions and N 2 H 5 OH [13;14], etc.…”

Section: Introductionmentioning

confidence: 99%

Red-ox reactions in aqueous solutions of Co(OAc)2 and K2S2O8 and synthesis of CoOOH nanolayers by the SILD method

Lobinsky¹,

Tolstoy²

2015

Nanosist.: fiz. him. mat.

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CoOOH nanolayers were first prepared by the successive ionic layer deposition (SILD) method using aqueous Co(OAc) 2 and K 2 S 2 O 8 solutions. The obtained nanolayers were investigated by SEM, EDX, XRD, FTIR spectroscopy and electrochemical techniques. SEM images showed that the layers formed by nanosheets of size approximately 80-100 nm which had a hexagonal crystal structure. Electrochemical study of nickel foam electrodes modified by CoOOH layer prepared by 50 SILD cycles demonstrates that specific capacitance of the film is 1520 F/g at current density 1 A/g. Repeated cycling for 1000 charge-discharge cycles demonstrates 2% capacitance fade, so such electrodes may be used as pseudocapacitor electrodes.

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A Novel Oxidation‐Reduction Route for Layer‐by‐Layer Synthesis of TiO₂ Nanolayers and Investigation of Its Photocatalytical Properties

Cited by 7 publications

References 25 publications

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

The effect of microtube formation with walls, containing Fe3O4 nanoparticles, via gassolution interface technique by hydrolysis of the FeCl2 and FeCl3 mixed solution with gaseous ammonia

Red-ox reactions in aqueous solutions of Co(OAc)2 and K2S2O8 and synthesis of CoOOH nanolayers by the SILD method

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A Novel Oxidation‐Reduction Route for Layer‐by‐Layer Synthesis of TiO2 Nanolayers and Investigation of Its Photocatalytical Properties

Cited by 7 publications

References 25 publications

Preparation of rGO/Bi2O3 composites by hydrothermal synthesis for supercapacitor electrode

Preparation of rGO/Bi2O3 composites by hydrothermal synthesis for supercapacitor electrode

The effect of microtube formation with walls, containing Fe3O4 nanoparticles, via gassolution interface technique by hydrolysis of the FeCl2 and FeCl3 mixed solution with gaseous ammonia

Red-ox reactions in aqueous solutions of Co(OAc)2 and K2S2O8 and synthesis of CoOOH nanolayers by the SILD method

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A Novel Oxidation‐Reduction Route for Layer‐by‐Layer Synthesis of TiO₂ Nanolayers and Investigation of Its Photocatalytical Properties

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode