UV and visible hydrogen photo-production using Pt promoted Nb-doped TiO 2 photo-catalysts: Interpreting quantum efficiency

Fontelles-Carceller, Olga; Muñoz‐Batista, Mario J.; Conesa, J.C.; Fernández-García, Marcos; Kubacka, Anna

doi:10.1016/j.apcatb.2017.05.022

Cited by 45 publications

(31 citation statements)

References 83 publications

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“…In other cases we can see, for example, that: Cr (dominant Cr 3+ oxidation state with presence of Cr 6+ typically growing with the Cr content) is only marginally included in the anatase lattice, Ca 2+ , V 4+ (changing oxide state at surface to V 5+ ), Nd 3+ present a solubility limit of ca. 4–5 mol% and Mo (Mo 5+ and Mo 6+ ), Nb 5+ and W 6+ display up to 20–25 mol% solubility limit(s) [ 19 , 20 , 21 , 22 ]. As a general rule, optimum photoactivity under sunlight illumination can be connected with the limited structural disturbance of the anatase structure but with an effect in band gap energy.…”

Section: Doped Photocatalystsmentioning

confidence: 99%

Sunlight-Operated TiO2-Based Photocatalysts

et al. 2020

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Photo-catalysis is a research field with broad applications in terms of potential technological applications related to energy production and managing, environmental protection, and chemical synthesis fields. A global goal, common to all of these fields, is to generate photo-catalytic materials able to use a renewable energy source such as the sun. As most active photocatalysts such as titanium oxides are essentially UV absorbers, they need to be upgraded in order to achieve the fruitful use of the whole solar spectrum, from UV to infrared wavelengths. A lot of different strategies have been pursued to reach this goal. Here, we selected representative examples of the most successful ones. We mainly highlighted doping and composite systems as those with higher potential in this quest. For each of these two approaches, we highlight the different possibilities explored in the literature. For doping of the main photocatalysts, we consider the use of metal and non-metals oriented to modify the band gap energy as well as to create specific localized electronic states. We also described selected cases of using up-conversion doping cations. For composite systems, we described the use of binary and ternary systems. In addition to a main photo-catalyst, these systems contain low band gap, up-conversion or plasmonic semiconductors, plasmonic and non-plasmonic metals and polymers.

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Section: Doped Photocatalystsmentioning

confidence: 99%

Sunlight-Operated TiO2-Based Photocatalysts

et al. 2020

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“…Illumination is produced from one window uniformly (again similarly to our on‐top illumination in gas phase). The three rows correspond to samples having optical properties of; i) (top row) a strongly absorbing and forward scattering anatase sample (sample A); ii) (middle row) the P25 sample with shows roughly a medium absorbing capability and relatively modest forward scattering;, and iii) (lower row) a hypothetical material with rather mild absorbing capability (0.5×P25 value) and near isotropic scattering (sample B). The four columns of Figure correspond to four catalyst concentrations in water from 0.1 to 2 g L −1 .…”

Section: Introduction: the Problemmentioning

confidence: 99%

Operando Spectroscopy in Photocatalysis

et al. 2018

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The use of operando spectroscopic tools in heterogeneous photocatalysis has experienced a strong drive in recent years. When using operando tools we must, however, consider carefully the fraction of the system to be probed in an in situ cell, that is, the volume under the simultaneous influence of excitation light and the reactants. This is not an obvious task for certain spectroscopies, particularly for those attempting to characterize the physico-chemical state of the catalysts. Herein we provide an analysis of this point applied to spectroscopies such as XAS (X-ray absorption spectroscopy) and complete the analysis of operando tools with those aimed to characterize the surface of the photocatalysts (XPS; X-ray photoelectron spectroscopy) as well as those spectroscopies, such as infrared or Raman, focusing on the study of the reactantÀcatalyst interface.

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“…Recently, the titanium industry has become more and more important and popular due to its extensive applications in medicine, navigation, aerospace, functional materials, and catalytic industries [1][2][3][4][5][6]. In the contemporary industrial system, titanium metallurgy sponge and titanium metal use rutile (TiO 2 ) and ilmenite (FeTiO 3 ) as raw materials.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Structure and Mechanism of Styryl Phosphoric Acid at the Rutile–Water Interface

et al. 2018

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The microstructure and mechanism of styryl phosphoric acid (SPA) adsorbed at the rutile–water interface were investigated through zeta potential measurement, ultraviolet-visible spectrophotometry (UV-Vis), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results of the zeta potential measurement illustrate that SPA is mainly electrostatically adsorbed on the rutile surface, and the adsorption process and result can be well fitted by the Stern-Grahame equation. The adsorption is severely affected by pH due to different species of SPA occurring in different pH solutions. The compound of P–O–Ti, with a structure of bidentate binuclear or bidentate mononuclear complexes, is formed after SPA is adsorbed on the rutile surface. SPA can be adsorbed on the rutile surface through the coordination of self-polymerization and bidentate mononuclear, which greatly increases the hydrophobicity of the rutile surface. Based on the above analysis and discussion, we proposed the adsorption model of SPA at the rutile–water interface, which was conducive to the modification and synthesis of a highly efficient flotation collector of the primary rutile ore.

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UV and visible hydrogen photo-production using Pt promoted Nb-doped TiO 2 photo-catalysts: Interpreting quantum efficiency

Cited by 45 publications

References 83 publications

Sunlight-Operated TiO2-Based Photocatalysts

Sunlight-Operated TiO2-Based Photocatalysts

Operando Spectroscopy in Photocatalysis

Adsorption Structure and Mechanism of Styryl Phosphoric Acid at the Rutile–Water Interface

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