Preparation of WO3-reduced graphene oxide nanocomposites with enhanced photocatalytic property

Fu, Li; Xia, Tian; Zheng, Yuhong; Yang, Jun; Wang, Aiwu; Wang, Zhong

doi:10.1016/j.ceramint.2015.01.022

Cited by 78 publications

(23 citation statements)

References 34 publications

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“…First, the carbon matrix could act as an electron acceptor, favoring the diffusion and mobility of the photogenerated electrons via delocalization within the conjugated π-electron density of the graphene-like sheets of carbon. A similar behavior has been reported for hybrid catalysts incorporating carbon nanotubes and graphene as additives to semiconductors [59]. Secondly, due to the hydrophobic nature of the carbon, water molecules are confined (adsorbed) inside the nanopore voids of the carbon, which could influence the activation energy for water oxidation.…”

Section: Photoelectrochemical Response Of the Electrodessupporting

confidence: 70%

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Gomis‐Berenguer

Iniesta

Fermı́n

et al. 2018

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This work demonstrates the ability of nanoporous carbons to boost the photoelectrochemical activity of hexagonal and monoclinic WO3 towards water oxidation under irradiation. The impact of the carbonaceous phase was strongly dependent on the crystalline structure and morphology of the semiconductor, substantially increasing the activity of WO3 rods with hexagonal phase. The incorporation of increasing amounts of a nanoporous carbon of low functionalization to the WO3 electrodes improved the quantum yield of the reaction and also affected the dynamics of the charge transport, creating a percolation path for the majority carriers. The nanoporous carbon promotes the delocalization of the charge carriers through the graphitic layers. We discuss the incorporation of nanoporous carbons as an interesting strategy for improving the photoelectrochemical performance of nanostructured semiconductor photoelectrodes featuring hindered carrier transport.

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Section: Photoelectrochemical Response Of the Electrodessupporting

confidence: 70%

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Gomis‐Berenguer

Iniesta

Fermı́n

et al. 2018

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“…It further suggests the formation of WO 3 NRs on the surface of rGO sheet, as reported in earlier study. 25 The values of I D /I G for rGO-WO 3 and rGO are calculated to be 0.90 and 1.00, respectively. The reduced value of I D /I G in case of rGO-WO 3 composite indicates that the number of sp 2 bonded carbon atoms is increased during the in situ synthesis of rGO-WO 3 composite.…”

Section: Raman Spectroscopymentioning

confidence: 97%

“…In the Raman spectra of GO, the position of D and G bands are found to be $1354 and $1591 cm À1 , respectively. 25 The G band is attributed to the rst order phonon scattering of the E 2g mode consisting of sp 2 hybridized C-C bonds in a two-dimensional hexagonal lattice whereas the D band results from sp 3 hybridized carbon, defects, and structural imperfections in the graphite layers. Thus, the value of I D /I G provides information about sp 2 bonded carbons, which are mainly responsible for the formation of the 2D structure of the rGO sheet.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The red shi in the value of the absorption edge in rGO-WO 3 composite may be due to the restoration of the p-p transition of the aromatic C-C bonds of rGO-WO 3 composite. 25 The band gap energy of these samples can be calculated from the absorption spectra. The following expression was used to calculate the optical band gap for pure WO 3 NRs and rGO-WO 3 composite: 28 (ahn) n ¼ K(hn À E g ) where a, hn, E g , and K are the absorption coefficient, incident photon energy, band gap, and a constant, respectively.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…It is in good agreement with the results reported in the earlier study. 25 Hence, the light absorption and emission properties of WO 3 NRs may be modied by decorating it over the rGO sheet, which may be helpful to nd its applications in various elds of science and technology.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Tailoring of enhanced interfacial polarization in WO₃ nanorods grown over reduced graphene oxide synthesized by a one-step hydrothermal method

et al. 2017

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In the present report, well-defined WO 3 nanorods (NRs) and a rGO-WO 3 composite were successfully synthesized using a one-pot hydrothermal method. The crystal phase, structural morphology, shape, and size of the as-synthesized samples were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. The optical properties of the synthesized samples were investigated by Raman, ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy. Raman spectroscopy and TEM results validate the formation of WO 3 (NRs) on the rGO sheet. The value of the dielectric constant (3 0 ) of WO 3 NRs and rGO-WO 3 composite is decreased with an increase in frequency. At low frequency (2.5 to 3.5 Hz), the value of 3 0 for the rGO-WO 3 composite is greater than that of pure WO 3NRs. This could be due to the fact that the induced charges follow the ac signal. However, at higher frequency (3.4 to 6.0), the value of 3 0 for the rGO-WO 3 composite is less compared to that of the pure WO 3 NRs. The overall decrease in the value of 3 0 could be due to the occurrence of a polarization process at the interface of the rGO sheet and WO 3 NRs. Enhanced interfacial polarization in the rGO-WO 3 composite is observed, which may be attributed to the presence of polar functional groups on the rGO sheet. These functional groups trap charge carriers at the interface, resulting in an enhancement of the interfacial polarization. The value of the dielectric modulus is also calculated to further confirm this enhancement. The values of the ac conductivity of the WO 3 NRs and rGO-WO 3 composite were calculated as a function of the frequency. The greater value of the ac conductivity in the rGO-WO 3 composite compared to that of the WO 3 NRs confirms the restoration of the sp 2 network during the in situ synthesis of the rGO-WO 3 composite, which is well supported by the results obtained by Raman spectroscopy. Fig. 8 Frequency dependence of (a) dielectric constant, (b) dielectric loss, (c) imaginary part of electric modulus, and (d) ac conductivity of WO 3 NRs and rGO-WO 3 composite.This journal is

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Enhancement of Photocatalytic Degradation of Methylene Blue Dye Using Graphene Oxide Based Ternary Nanocomposite

Yadav,

Sharma,

Kumari

et al. 2023

ChemistrySelect

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The scarcity of pure water, as well as the growing water shortage, highlight the importance of finding an efficient material for wastewater treatment. Treating pollutants present in wastewater is a challenging task so several methods have been developed for the treatment of pollutants present in wastewater. Among all, utilizing graphene based nanocomposite as adsorbent is a good option and can be utilized efficiently for wastewater treatment. In this work graphene oxide (GO) based ternary nanocomposite was synthesized via the co‐precipitation method and utilized for the photocatalytic degradation of methylene blue (MB) dye. Powder X‐ray Diffraction (PXRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive Spectroscopy (EDS), High Resolution Transmission Electron Microscope (HRTEM), UV‐vis Diffuse Reflectance Spectra (DRS), Brunauer‐ Emmett & Teller (BET) method, and UV‐Vis spectroscopy were used to investigate the formation of GO‐TiO2‐Fe2O3 (GTF) nanocomposites and the effect of graphene oxide addition on the photophysical properties of the composite. XRD data confirmed the high crystallinity of the obtained ternary nanocomposite. HRTEM and FESEM instruments confirmed the shape and morphology of the GTF nanocomposite which were found to be spherical with an average particle size of 20–80 nm. The photocatalytic degradation of the ternary composite was examined using MB as a model dye. The efficiency of the GTF nanocomposite was examined and compared with GO‐TiO2‐Fe2O3‐GG (GTF‐GG) and GO. The degradation efficiency of GTF‐GG, GTF, and GO was found to be 89.82 %, 77.34 % and 58.15 % within 270 min respectively. The prepared nanocomposite may be a promising material for the photocatalytic degradation of dye effluent present in wastewater.

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Preparation of WO3-reduced graphene oxide nanocomposites with enhanced photocatalytic property

Cited by 78 publications

References 34 publications

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Tailoring of enhanced interfacial polarization in WO₃ nanorods grown over reduced graphene oxide synthesized by a one-step hydrothermal method

Enhancement of Photocatalytic Degradation of Methylene Blue Dye Using Graphene Oxide Based Ternary Nanocomposite

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Preparation of WO3-reduced graphene oxide nanocomposites with enhanced photocatalytic property

Cited by 78 publications

References 34 publications

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Photoelectrochemical Response of WO3/Nanoporous Carbon Anodes for Photocatalytic Water Oxidation

Tailoring of enhanced interfacial polarization in WO3 nanorods grown over reduced graphene oxide synthesized by a one-step hydrothermal method

Enhancement of Photocatalytic Degradation of Methylene Blue Dye Using Graphene Oxide Based Ternary Nanocomposite

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Tailoring of enhanced interfacial polarization in WO₃ nanorods grown over reduced graphene oxide synthesized by a one-step hydrothermal method