Visible light photoelectrochemical response of copper deposited titanium dioxide nanotubes

Lai, Chin Wei; Sreekantan, Srimala

doi:10.1051/epjap/2012120009

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…In this regard, for modified films, no evident shifts are in the peak positions of TiO 2 for two temperatures investigated, suggesting that Cu 2+ was not incorporated into the lattice of TiO 2 nanotubes to form Cu-O-Ti bonds or located at interstitial sites, in agreement with other studies [47]. In doping processes, the ionic radius of Cu 2+ (0.870 Å) is larger than of Ti 4+ (0.745 Å) [48], and its substitutional doping in the TiO 2 matrix induces a great distortion of the unit cell that might enable displacement on diffractogram determined by XRD analysis [29,49].…”

Section: Confection and Characterization Of Cu X O-decorated Tio 2 Nanotubes Compositessupporting

confidence: 88%

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Almeida

Pacheco

Brito

et al. 2020

J Solid State Electrochem

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Many studies are focused on the development of materials for converting carbon dioxide into multicarbon oxygenates such as methanol and ethanol, because of their higher energy density and wider applicability. In this work, TiO 2 nanotubes (NT/TiO 2 ) were modified with Cu x O nanoparticles in order to investigate the contribution of different ratio of Cu 2 O/CuO and its distribution over NT/TiO 2 for CO 2 photoelectro-conversion to methanol. The photoelectrodes were built by anodization process to obtain NT/TiO 2 layer, and the decoration with Cu x O hybrid system was carried out by electrodeposition process, using Na 2 SO 4 or acid lactic as electrolyte, followed by annealing at different temperatures. X-ray photoelectron spectroscopy analysis revealed the predominance of Cu +1 and Cu +2 at 150°C and 300°C, respectively. X-ray diffraction and scanning electron microscopy indicated that under lactic acid solution, the oxide nanoparticles exhibited small size, cubic shape, and uniform distribution on the nanotube wall. While under Na 2 SO 4 electrolyte, large nanoparticles with two different morphologies, octahedral and cubic shapes, were deposited on the top of the nanotubes. All modified electrodes converted CO 2 in methanol in different quantities, identified by gas chromatograph. However, the NT/TiO 2 modified with CuO/Cu 2 O (80:20) nanoparticles using lactic acid as electrolyte showed better performance in the CO 2 reduction to methanol (0.11 mmol L −1 ) in relation to the other electrodes. In all cases, a blend among the structures and nanoparticle morphologies were achieved and essential to create new site of reactions what improved the use of light irradiation, minimization of charge recombination rate and promoted high selectivity of products.Keywords CO 2 photoelectroreduction . Hybrid TiO 2 -Cu x O photocatalysts . p-n heterojunction . Electrolyte design . Methanol formation

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Section: Confection and Characterization Of Cu X O-decorated Tio 2 Nanotubes Compositessupporting

confidence: 88%

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Almeida

Pacheco

Brito

et al. 2020

J Solid State Electrochem

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“…When a noble metal is deposited onto TiO 2 , Schottky barriers will form at the junctions and the metal species will act as electron reservoirs to trap electrons and this can greatly extend the lifetime of electron–hole pairs and hence the photocatalytic efficiency of TiO 2 . It has been reported that copper metal can be one of the best candidates for deposition onto TiO 2 catalyst as an efficient electron trapper .…”

Section: Introductionmentioning

confidence: 99%

Photo and Chemical Reduction of Copper onto Anatase‐Type TiO₂ Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

Eskandarloo

Badiei

Behnajady

et al. 2015

Photochem & Photobiology

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In this study, the photocatalytic efficiency of anatase-type TiO2 nanoparticles synthesized using the sol-gel low-temperature method, were enhanced by a combined process of copper reduction and surface hydroxyl groups enhancement. UV-light-assisted photo and NaBH4 -assisted chemical reduction methods were used for deposition of copper onto TiO2. The surface hydroxyl groups of TiO2 were enhanced with the assistance of NaOH modification. The prepared catalysts were immobilized on glass plates and used as the fixed-bed systems for the removal of phenazopyridine as a model drug contaminant under visible light irradiation. NaOH-modified Cu/TiO2 nanoparticles demonstrated higher photocatalytic efficiency than that of pure TiO2 due to the extending of the charge carriers lifetime and enhancement of the adsorption capacity of TiO2 toward phenazopyridine. The relationship of structure and performance of prepared nanoparticles has been established by using various techniques, such as XRD, XPS, TEM, EDX, XRF, TGA, DRS and PL. The effects of preparation variables, including copper content, reducing agents rate (NaBH4 concentration and UV light intensity) and NaOH concentration were investigated on the photocatalytic efficiency of NaOH-modified Cu/TiO2 nanoparticles.

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Effect of Carbon Reductant on the Formation of Copper Doped Titanium Oxycarbonitride by Carbothermal Reduction and Nitridation

Hui

Shoparwe

Rezan

et al. 2017

The Minerals, Metals &Amp; Materials Series

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Visible light photoelectrochemical response of copper deposited titanium dioxide nanotubes

Cited by 7 publications

References 46 publications

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Photo and Chemical Reduction of Copper onto Anatase‐Type TiO₂ Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

Effect of Carbon Reductant on the Formation of Copper Doped Titanium Oxycarbonitride by Carbothermal Reduction and Nitridation

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Visible light photoelectrochemical response of copper deposited titanium dioxide nanotubes

Cited by 7 publications

References 46 publications

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction

Photo and Chemical Reduction of Copper onto Anatase‐Type TiO2 Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

Effect of Carbon Reductant on the Formation of Copper Doped Titanium Oxycarbonitride by Carbothermal Reduction and Nitridation

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Photo and Chemical Reduction of Copper onto Anatase‐Type TiO₂ Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts