Enhanced photocatalytic activity of Pt-TiO2/WO3 hybrid material with energy storage ability

Khan, Hizbullah; Rigamonti, Marco G.; Boffito, Daria C.

doi:10.1016/j.apcatb.2019.04.019

Cited by 88 publications

(33 citation statements)

References 45 publications

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“…Platinum addition is reported to enhance the electron storage ability, the visible activity and the electron-hole separation of photocatalysts by the creation of Schottky-type junctions, thus facilitating the charge transfer at the catalyst-environment interface [405]. By varying the platinum amount from 0.2 to 1 wt.% in Pt/TiO 2 -WO 3 materials prepared through the spray drying method, the optimum amount for the degradation of methylene blue (MB) was found at 0.8 wt.% Pt.…”

Section: Metal-doped Wo 3 -Tio 2 -Doped Systemsmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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Section: Metal-doped Wo 3 -Tio 2 -Doped Systemsmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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“…In addition to the two major peaks that appeared at 459.1 and 464.7 eV, assigned to Ti 4+ , the other peak was centered at about 460.1 eV, corresponding to Ti–O–W bonds of catalyst surface, which were related to tungsten titanate surface species. , As displayed in Figure d, the O 1s spectrum can be easily divided to three peaks. The peak located at 530.4 eV was attributed to lattice oxygen (Ti 4+ –O/W 6+ –O), and the peak that appeared at 531.3 eV was due to surface hydroxyl groups . The last peak at 533.3 eV corresponded to oxygen bonded to carbon (C–O) or adsorbed water (H 2 O ads ) .…”

Section: Resultsmentioning

confidence: 99%

“…The doublet peaks at 35.8 and 38.0 eV corresponded to W 4f 7/2 and W 4f 5/2 , respectively, and were consistent with the theoretical value of the W 6+ oxidation state. 45 The peak at 37.1 eV was assigned to Ti 3p, while two new peaks appearing at 39.4 and 41.6 eV in the spectrum were attributed to the formation of Ti−O−W bonds associated with tungsten titanate surface species. 44 This was consistent with previous analysis of the Ti 2p spectrum.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…43,44 As displayed in Figure 2d, the O 1s spectrum can be easily divided to three peaks. The peak located at 530.4 eV was attributed to lattice oxygen (Ti 4+ −O/W 6+ −O), 45 and the peak that appeared at 531.3 eV was due to surface hydroxyl groups. 44 The last peak at 533.3 eV corresponded to oxygen bonded to carbon (C−O) or adsorbed water (H 2 O ads ).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Enhanced Ni/W/Ti Catalyst Stability from Ti–O–W Linkage for Effective Conversion of Cellulose into Ethylene Glycol

Liu

Zhou

et al. 2020

ACS Sustainable Chem. Eng.

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Direct conversion of cellulose into ethylene glycol is a promising route for transforming sustainable biomass resources into high-value chemicals. Although numerous attempts have been made to exploit tungsten-based hydrogenolysis catalysts in the catalytic conversion of cellulose to ethylene glycol for high conversion rate and selectivity, maintaining catalyst stability remains challenging. Herein, we have developed a Ni−W/M catalyst with good catalytic performance and stability, which were obtained by calcining Ni−W/MIL-125(Ti) precursor. The synthesized catalyst showed good cellulose conversion rate (100%) and ethylene glycol yield (68.7%). The tungsten species was linked to the TiO 2 support by Ti−O−W bonds to reduce loss of the active tungsten component. The formation of new bonds enhanced the catalyst stability and durability, enabling the catalysts to retain high catalytic activity during recycling.

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“…After the coalescence occurred, the emulsion droplet increased until they burst, followed by aggregation and sedimentation of the J-Pt/TNS particles from the emulsion phase to the water phase, resulting in the reduction in the reaction area at the emulsion interface. It was this Janus-type modification method that increased the contact surface area between the photocatalyst and the oil-water interface, since it could open the source of transport channels for the molecules involved in the process redox reactions and effectively separate the photogenerated charge carriers, thus reducing the electronhole pairs recombination (Khan et al, 2019). Besides, with the high dispersion of Pt nanoparticle provided more active site compared to agglomerated states (Sui et al, 2017).…”

Section: Photocatalytic H 2 Productionmentioning

confidence: 99%

Robust Hydrogen Production via Pickering Interfacial Catalytic Photoreforming of n-Octanol-Water Biphasic System

et al. 2021

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Pickering emulsion offers a promising platform for conducting interfacial reactions between immiscible reagents; it is particularly suitable for hydrogen production by photoreforming of non-water soluble biomass liquid and water. Herein, Pt-promoted (001)-facet-dominated anatase TiO2 nanosheets were synthesized by a hydrothermal route associated with microfluidic technology for high activity and metal dispersion, and selective surface modification was carried out for preparing Janus particles. Photoreforming hydrogen production through n-octanol and water that formed O/W microemulsion with an average diameter of 540 µm was achieved to obtain amphiphilic catalyst. The as-prepared 2D Janus-type catalysts exhibited remarkably stable emulsification performance as well as photocatalytic activity. This finding indicates that triethoxyfluorosilane had negligible impact on the catalytic performance, yet provided a remarkable benefit to large specific surface area at microemulsion interface, thereby enhancing the H2 yield up to 2003 μmol/g. The cyclic experiments indicate that the decrease in cyclic performance was more likely to be caused by the coalescence of the microemulsion rather than the decrease in catalytic activity, and the microemulsion could be easily recovered by simply hand shaking to more than 96% of the initial performance.

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Enhanced photocatalytic activity of Pt-TiO2/WO3 hybrid material with energy storage ability

Cited by 88 publications

References 45 publications

Tungsten-Based Catalysts for Environmental Applications

Tungsten-Based Catalysts for Environmental Applications

Enhanced Ni/W/Ti Catalyst Stability from Ti–O–W Linkage for Effective Conversion of Cellulose into Ethylene Glycol

Robust Hydrogen Production via Pickering Interfacial Catalytic Photoreforming of n-Octanol-Water Biphasic System

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