Electrochemical Performance of Morphologically Different Bi2WO6 Nanostructures Synthesized via a Hydrothermal Route

Wang, Fei; Yang, Hua; Zhang, Haimin; Su, Junyan; Wang, Xiangxian

doi:10.1007/s11664-016-4876-8

Cited by 19 publications

(4 citation statements)

References 30 publications

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“…Bismuth‐based materials, especially bismuth tungstate (Bi 2 WO 6 ), have broad application prospects in the degradation of organic compounds and hydrogen production from water splitting under visible light due to their chemical stability, low valence band edge and visible‐light‐induced activity 1 . It is generally believed that morphology, crystallinity and specific surface area are the key points for obtaining good photocatalytic performance under sunlight illumination 2‐5 . These points are not only related to the synthesis method, but also related to the choice of preparation factors.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Han

Chen

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Bismuth tungstate (Bi2WO6) has attractive photocatalytic performance in the degradation of organic compounds under visible light. The preparation conditions have an important influence on its properties. In this research, the effect of synthetic factors on the structure and photocatalytic activity of Bi2WO6 was investigated based on an orthogonal experimental design using a hydrothermal method. RESULTS It was found that the effect of pH value was greater than that of temperature and time. A three‐dimensional spherical Bi2WO6 superstructure was hydrothermally synthesized using a pH of 0.36 and temperature of 200 °C for 20 h. It was found to have the best photocatalytic activity, with 98% degradation efficiency of rhodamine B in 30 min under visible light irradiation. CONCLUSIONS The orthogonal design for optimal synthesis of Bi2WO6 with hierarchical microsphere architecture promotes a positive balance between superstructure and high photocatalytic degradation performance. © 2021 Society of Chemical Industry (SCI).

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Section: Introductionmentioning

confidence: 99%

Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Han

Chen

et al. 2021

J of Chemical Tech & Biotech

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“…Very few research activities have been initiated to study the electrochemical water-splitting applications of tungstates. 14−18 Further, the morphological variations and compactness, more number of active sites, low overpotential, high electrochemical stability, and fast charge transportation mechanism of these electrocatalysts are the significant features for the efficient electrolysis of water. 19,20 Hence, nanocatalyst preparation with a diverse morphology assisted by surfactants is a promising approach to tune the material properties, achieved by the research society nowadays.…”

Section: Introductionmentioning

confidence: 99%

“…There have been many attempts to study the use of these materials as electrodes for photocatalytic and supercapacitor applications, wherein the tungsten-based nanocomposites are reported as photoanodes and photocatalysts, , symmetric and asymmetric electrodes, and so forth. Very few research activities have been initiated to study the electrochemical water-splitting applications of tungstates. − Further, the morphological variations and compactness, more number of active sites, low overpotential, high electrochemical stability, and fast charge transportation mechanism of these electrocatalysts are the significant features for the efficient electrolysis of water. , Hence, nanocatalyst preparation with a diverse morphology assisted by surfactants is a promising approach to tune the material properties, achieved by the research society nowadays. Among other surfactants, polyvinylpyrrolidone (PVP) played a selective role in nanomaterial synthesis.…”

Section: Introductionmentioning

confidence: 99%

Bi₂WO₆ and FeWO₄ Nanocatalysts for the Electrochemical Water Oxidation Process

et al. 2019

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Polyvinylpyrrolidone (PVP)-assisted nanocatalyst preparation was succeeded by employing a controlled solvothermal route to produce efficient electrodes for electrochemical water-splitting applications. Bi 2 WO 6 and FeWO 4 nanocatalysts have been confirmed through the strong signature of (113) and (111) crystal planes, respectively. The binding natures of Bi–W–O and Fe–W–O have been thoroughly discussed by employing X-ray photoelectron spectroscopy which confirmed the formation of Bi 2 WO 6 and FeWO 4 . The freestanding nanoplate array morphology of Bi 2 WO 6 and the fine nanosphere particle morphology of FeWO 4 nanocatalysts were revealed by scanning electron microscopy images. With these confirmations, the fabrication of durable, long-term electrodes for electrochemical water splitting has been subjected to efficient oxidation of water, confirmed by obtaining 2.79 and 1.96 mA/g for 0.5 g PVP-assisted Bi 2 WO 6 and FeWO 4 nanocatalysts, respectively. The water oxidation mechanism of both nanocatalysts has been revealed with the support of 24 h stability test over continuous water oxidation and faster charge transfer achieved by the smaller Tafel slope values of 75 and 78 mV/dec, respectively. Generally, these nanocatalysts are utilized for photocatalytic applications. The present study revealed the PVP-assisted synthesis to produce electrocatalytically active nanocatalysts and their electrochemical water-splitting mechanism which will offer a pathway for research interests with regard to the production of multifunctional nanocatalysts for both electro- and photocatalytic applications in the near future.

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“…There are some studies focusing on the effect of changing the pH at 200 °C, however, in these works, the very acidic (below pH 1) and very alkaline (above pH 13) ranges were not studied. In addition, in these works, the full pH range was not investigated, but rather only a part of it, that is, between pH 1–11, 2–12, 4–8, and 4–11 [26,53,54,55,56,57,58,59].…”

Section: Introductionmentioning

confidence: 99%

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

et al. 2019

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In this study, Bi2WO6 was prepared by the hydrothermal method. The effects of reaction temperature (150/170/200 °C) and reaction time (6/12/24 h) were investigated. The role of strongly acidic pH (1 >) and the full range between 0.3 and 13.5 were studied first. Every sample was studied by XRD and SEM; furthermore, the Bi2WO6 samples prepared at different temperatures were examined in detail by EDX and TEM, as well as FT-IR, Raman and UV-vis spectroscopies. It was found that changing the temperature and time slightly influenced the crystallinity and morphology of the products. The most crystallized product formed at 200 °C, 24 h. The pure, sheet-like Bi2WO6, prepared at 200 °C, 24 h, and 0.3 pH, gradually transformed into a mixture of Bi2WO6 and Bi3.84W0.16O6.24 with increasing pH. The nanosheets turned into a morphology of mixed shapes in the acidic range (fibers, sheets, irregular forms), and became homogenous cube- and octahedral-like shapes in the alkaline range. Their band gaps were calculated and were found to vary between 2.66 and 2.59 eV as the temperature increased. The specific surface area measurements revealed that reducing the temperature favors the formation of a larger surface area (35.8/26/21.6 m2/g belonging to 150/170/200 °C, respectively).

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Electrochemical Performance of Morphologically Different Bi2WO6 Nanostructures Synthesized via a Hydrothermal Route

Cited by 19 publications

References 30 publications

Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Bi₂WO₆ and FeWO₄ Nanocatalysts for the Electrochemical Water Oxidation Process

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

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Electrochemical Performance of Morphologically Different Bi2WO6 Nanostructures Synthesized via a Hydrothermal Route

Cited by 19 publications

References 30 publications

Orthogonal test design for optimization of synthesis ofBi2WO6superstructure with high photocatalytic activity by hydrothermal method

Orthogonal test design for optimization of synthesis ofBi2WO6superstructure with high photocatalytic activity by hydrothermal method

Bi2WO6 and FeWO4 Nanocatalysts for the Electrochemical Water Oxidation Process

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

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Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Orthogonal test design for optimization of synthesis ofBi₂WO₆superstructure with high photocatalytic activity by hydrothermal method

Bi₂WO₆ and FeWO₄ Nanocatalysts for the Electrochemical Water Oxidation Process