Au/TiO2-CeO2 Catalysts for Photocatalytic Water Splitting and VOCs Oxidation Reactions

Fiorenza, Roberto; Bellardita, Marianna; D’Urso, Luisa; Compagnini, Giuseppe; Palmisano, Leonardo; Scirè, Salvatore

doi:10.3390/catal6080121

Cited by 68 publications

(41 citation statements)

References 63 publications

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“…Table 3 shows the values of specific surface area (S BET ), total pore volume (V T ), and average pore size (D a ) of RGO-TiO 2 photoanode materials that are calculated from the isotherms. The S BET of pure TiO 2 is a little bit lower than reported, because it had been calcined twice as other photoanode materials [32]. The S BET of the RGO-TiO 2 photoanodes are increased with the increasing amount of RGO due to the high specific surface area of RGO.…”

Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 89%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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The sintered TiO 2 nanofilms were immersed in the aqueous solution of graphite oxide and then were thermally reduced to reduced graphene oxide (RGO), resulting in RGO-doped TiO 2 photoanodes employed in the dye-sensitized solar cells (DSSCs). This preparation method for the reduced graphene oxide-TiO 2 (RGO-TiO 2 ) photoanode could avoid the loss of RGO during the sintering process. The presence of RGO in the photoanodes was confirmed using Raman analysis, scanning electron microscopy, transmission electron microscopy, and energy-dispersive spectrometer. The amount of RGO in photoanode was obtained by thermo-gravimetric analysis. Other techniques such as X-ray diffraction, Brunauer-Emmett-Teller, electron energy loss spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the composite materials of RGO-TiO 2 . The J-V measurement of RGO-TiO 2 -based DSSCs showed that the best photoelectric conversion efficiency (g) of 6.85% is 11.7% higher than that of the pure TiO 2 (P25-TiO 2 )-based DSSCs. It was shown that RGO in the photoanode could facilitate the phase transition in TiO 2 crystals (from anatase to rutile) resulting in the mixed crystals in the photoanodes. The existence of RGO and mixed-crystal structure of TiO 2 changed the electronic transmission pathway, reduced the recombination rate of electron-hole pairs, and thus improved the g of DSSCs.

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Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 89%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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“…TiO 2 nanotubes (TNTs) synthesized via anodization have generated significant attention in recent years [1,2] because of their extraordinarily technological importance and improved photoelectric properties for a wide variety of applications such as solar cells [3], photocatalysis [4], gas sensors [5,6], water splitting [7,8], and developing functional surface devices [9]. Moreover, TiO 2 decorated with reduced graphene oxide (RGO) [10], graphene oxide (GO) [11,12], and bismuth (Bi) [13] have been widely investigated owing to their lack of toxicity, high chemical stability, and capability of photooxidative destruction of most organic pollutants [14].…”

Section: Introductionmentioning

confidence: 99%

Continuous-Flow Photocatalytic Degradation of Organics Using Modified TiO2 Nanocomposites

Ali

Kim

2018

Catalysts

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Abstract:In this study, TiO 2 nanotubes (TNTs) were fabricated on a Ti sheet following the anodic oxidation method and were decorated with reduced graphene oxide (RGO), graphene oxide (GO), and bismuth (Bi) via electrodeposition. The surface morphologies, crystal structures, and compositions of the catalyst were characterized by field emission scanning electron microscopy, Auger electron spectroscopy, X-ray diffraction, photoluminance spectra, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. The TNTs loaded with RGO, GO, and Bi were used in a continuous-flow system as photocatalysts for the degradation of methylene blue (MB) dye. It was found that the TNTs are efficient photocatalysts for the removal of color from water; upon UV irradiation on TNTs, the MB removal ratio was~89%. Moreover, the photocatalytic activities of the decorated TNTs were higher than that of pristine TNTs in visible light. In comparison with TNTs, the rate of MB removal in visible light was increased by a factor of 3.4, 3.2, and 2.9 using RGO-TNTs, Bi-TNTs, and GO-TNTs, respectively. The reusability of the catalysts were investigated, and their quantum efficiencies were also calculated. The cylindrical anodized TNTs were excellent photocatalysts for the degradation of organic pollutants. Thus, it was concluded that the continuous-flow photocatalytic reactor comprising TNTs and modified TNTs is suitable for treating wastewater in textile industries.

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“…Therefore, the effective function of photoexcitation is suppressed greatly.Considering the above two factors, the improvement of the photocatalytic efficiency of TiO 2 can be obtained through two aspects: the improvement of solar light utilization efficiency and the suppression of recombination of electron and hole pairs. In this text, surface modification and hybridization of TiO 2 such as noble metal loading [26][27][28][29] and semiconductor heterojunction [30][31][32] are effective methods to enhance the photocatalytic performance. The Schottky barrier formed at the interface between the noble metal material and TiO 2 can effectively promote the separation of photogenerated carriers.…”

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confidence: 99%

Compositing Two-Dimensional Materials with TiO2 for Photocatalysis

et al. 2018

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Energy shortage and environmental pollution problems boost in recent years. Photocatalytic technology is one of the most effective ways to produce clean energy—hydrogen and degrade pollutants under moderate conditions and thus attracts considerable attentions. TiO2 is considered one of the best photocatalysts because of its well-behaved photo-corrosion resistance and catalytic activity. However, the traditional TiO2 photocatalyst suffers from limitations of ineffective use of sunlight and rapid carrier recombination rate, which severely suppress its applications in photocatalysis. Surface modification and hybridization of TiO2 has been developed as an effective method to improve its photocatalysis activity. Due to superior physical and chemical properties such as high surface area, suitable bandgap, structural stability and high charge mobility, two-dimensional (2D) material is an ideal modifier composited with TiO2 to achieve enhanced photocatalysis process. In this review, we summarized the preparation methods of 2D material/TiO2 hybrid and drilled down into the role of 2D materials in photocatalysis activities.

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Au/TiO2-CeO2 Catalysts for Photocatalytic Water Splitting and VOCs Oxidation Reactions

Cited by 68 publications

References 63 publications

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

Continuous-Flow Photocatalytic Degradation of Organics Using Modified TiO2 Nanocomposites

Compositing Two-Dimensional Materials with TiO2 for Photocatalysis

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