Improved photoelectrochemical properties of TiO2-graphene nanocomposites: Effect of defect induced visible light absorption and graphene conducting channel for carrier transport

Mehta, Manan; Chandrabose, Gauthaman; Krishnamurthy, Satheesh; Avasthi, D.K.; Chowdhury, Sushabhan

doi:10.1016/j.apsadv.2022.100274

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…From these spectra can be seen the Raman shift of TiO 2 anatase, vibration stretching symmetry of O-Ti-O at 143.97 cm −1 (E g ), vibration peaks of Ti-O at 396.8 cm −1 (B 1g ), 513.98 cm −1 (B 1g ) and 636.45 cm −1 (E g ). This Raman shift is in accordance with TiO 2 pristine [3,44]. These results are confirmed by XRD analysis.…”

Section: Resultssupporting

confidence: 81%

Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

2023

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In order to extend the visible region activity of titania nanotube array (TNAs) films, the successive ionic layer adsorption and reaction (SILAR)-ultrasonication-assisted method has been used to prepare BiOI-modified TiO 2 nanotube arrays (BiOI/TNAs). The band gap of BiOI/TNAs for all the variations reveals absorption in the visible absorption. The surface morphology of BiOI/TNAs is shown in the nanoplate, nanoflake and nanosheet forms with a vertical orientation perpendicular to TiO 2 . The crystalline structure of BiOI did not change the structure of the anatase TNAs, with the band gap energy of the BiOI/TNAs semiconductor in the visible region. The photocurrent density of the BiOI/TNAs extends to the visible-light range. BiOI/TNAs prepared with 1 mM Bi and 1 mM KI on TNAs 40 V 1 h, 50 V 30 min show the optimum photocurrent density. A tandem dye-sensitized solar cell (DSSC)-photoelectrochemical (PEC) was used for hydrogen production in salty water. BiOI/TNAs optimum was used as the photoanode of the PEC cell. The solar to hydrogen conversion efficiency (STH) of tandem DSSC-PEC reaches 1.34% in salty water.

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Section: Resultssupporting

confidence: 81%

Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

2023

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“…The cross-linked fringes and asymmetrical patterns of the synthesized NCs help the nanocomposite to achieve high-quality results and contribute to the rigidity of the structure. Based on its atomic number (α Z 2 ), the mass-to-thickness idea of the elements present is outlined in Figure e by scanning TEM (S-TEM) with a high-angle annular dark field (HAADF). − Each element’s atomic number determines the lighter and darker portions in the colored representations. In HAADF analysis, the greater the Z value, the darker the depiction of that specific element, and vice versa.…”

Section: Resultsmentioning

confidence: 99%

CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

Behera,

Alqahtani,

Chakrabortty

et al. 2023

ACS Omega

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The present study deals with sonochemically in situ synthesis of a novel functional catalyst using hydrogen exfoliated graphene (HEG) supported titanium dioxide (TiO2) and copper sulfate (CuSO4) doped with zinc oxide (ZnO) (abbreviated as Ti/Cu/Zn-HEG). The synthesis of the Ti/Cu/Zn-HEG nanocomposite (NCs) catalyst was confirmed through its characterizations by XRD, SEM-EDX, TEM, XPS, FTIR, and BET methods. It was assessed for catalytic conversion of a model aromatic compound para-nitrophenol (p-NP) in an aqueous solution. The p-NP is a nitroaromatic compound that has a toxic and mutagenic effect. Its removal from the water system is necessary to protect the environment and living being. The newly synthesized Ti/Cu/Zn-HEG NCs were applied for their higher stability and catalytic activity as a potential candidate for reducing p-NP in practice. The operating parameters, such as p-NP concentration, catalyst dosage, and operating time were optimized for 150 ppm, 400 ppm, and 10 min through response surface methodology (RSM) in Design-Expert software to obtain the maximum reduction p-NP up to 98.4% at its normal pH of 7.1 against the controls (using HEG, Ti/Cu-HEG, and Zn-HEG). Analysis of variance of the response suggested the regression equation to be significant for the process with a major impact on catalyst concentration and operating time. The model prediction data (from RSM) and experimental data were corroborated well as reflected through model’s low relative error (RE < 0.10), high regression coefficient (R 2 > 0.97), and Willmott d-index (d will‑index > 0.95) values.

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“…Higher photoelectrochemical activity was also obtained for GO/In 2 S 3 /TiO 2 nanorods used as photocatalysts for photoelectrochemical water splitting [227]. The improved performance was attributed to the larger surface area, visible light absorption and improved carrier transport because of additional defect states [92,[228][229][230].…”

Section: Water Splittingmentioning

confidence: 89%

A Review on the Progress and Future of TiO2/Graphene Photocatalysts

et al. 2022

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TiO2 is seen as a low cost, well-known photocatalyst; nevertheless, its sluggish charge kinetics does limit its applications. To overcome this aspect, one of the recent approaches is the use of its composites with graphene to enhance its photoactivity. Graphene-based materials (nanosheets, quantum dots, etc.) allow for attachment with TiO2 nanostructures, resulting in synergistic properties and thus increasing the functionality of the resulting composite. The current review aims to present the marked progress recently achieved in the use of TiO2/graphene composites in the field of photocatalysis. In this respect, we highlight the progress and insights in TiO2 and graphene composites in photocatalysis, including the basic mechanism of photocatalysis, the possible design strategies of the composites and an overview of how to characterize the graphene in the mixed composites. The use of composites in photocatalysis has also been reviewed, in which the recent literature has opened up more questions related to the reliability, potential, repeatability and connection of photocatalytic mechanisms with the resulting composites. TiO2/graphene-based composites can be a green light in the future of photocatalysis, targeting pollution remediation, energy generation, etc.

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Improved photoelectrochemical properties of TiO2-graphene nanocomposites: Effect of defect induced visible light absorption and graphene conducting channel for carrier transport

Cited by 7 publications

References 29 publications

Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

A Review on the Progress and Future of TiO2/Graphene Photocatalysts

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Improved photoelectrochemical properties of TiO2-graphene nanocomposites: Effect of defect induced visible light absorption and graphene conducting channel for carrier transport

Cited by 7 publications

References 29 publications

Photoelectrochemical performance of BiOI/TiO 2 nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

Photoelectrochemical performance of BiOI/TiO 2 nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

CuO/TiO2/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

A Review on the Progress and Future of TiO2/Graphene Photocatalysts

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Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

Photoelectrochemical performance of BiOI/TiO ₂ nanotube arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods

CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol