Photocatalytic production of hydrogen by vanadium oxides under visible light irradiation

Shen, Tina F.-R.; Lai, Ming-Hong; Yang, Thomas C.-K.; Fu, I-Ping; Liang, Nai-Yun; Chen, Wen‐Tung

doi:10.1016/j.jtice.2011.06.004

Cited by 48 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, photogenerated electrons and holes can be efficiently separated, and the surface charge carrier transfer rate is enhanced [ 34 , 35 ]. V 2 O 5 itself has been used as a photocatalyst under UV light [ 36 , 37 , 38 , 39 ], visible light [ 40 ], and sunlight [ 41 ]. Xie, et al [ 42 ] obtained photoactive V 2 O 5 -TiO 2 nanocomposites for the oxidation of As(III).…”

Section: Introductionmentioning

confidence: 99%

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

et al. 2017

View full text Add to dashboard Cite

V2O5-TiO2 mixed oxide nanotube (NT) layers were successfully prepared via the one-step anodization of Ti-V alloys. The obtained samples were characterized by scanning electron microscopy (SEM), UV-Vis absorption, photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (DRX), and micro-Raman spectroscopy. The effect of the applied voltage (30–50 V), vanadium content (5–15 wt %) in the alloy, and water content (2–10 vol %) in an ethylene glycol-based electrolyte was studied systematically to determine their influence on the morphology, and for the first-time, on the photocatalytic properties of these nanomaterials. The morphology of the samples varied from sponge-like to highly-organized nanotubular structures. The vanadium content in the alloy was found to have the highest influence on the morphology and the sample with the lowest vanadium content (5 wt %) exhibited the best auto-alignment and self-organization (length = 1 μm, diameter = 86 nm and wall thickness = 11 nm). Additionally, a probable growth mechanism of V2O5-TiO2 nanotubes (NTs) over the Ti-V alloys was presented. Toluene, in the gas phase, was effectively removed through photodegradation under visible light (LEDs, λmax = 465 nm) in the presence of the modified TiO2 nanostructures. The highest degradation value was 35% after 60 min of irradiation. V2O5 species were ascribed as the main structures responsible for the generation of photoactive e− and h+ under Vis light and a possible excitation mechanism was proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Most studies in the field of photocatalysis are focusedo nt he synthesis,c haracterization of properties,a nd testing of nanomaterials able to catalyze the degradation of pollutants, [32][33][34][35][36][37][38][39][40][41] water splitting, [42][43][44][45][46][47][48][49] or the photoreforming of organic compounds. [50][51][52][53] Some materials used for these applications are transition metal oxides, [54][55][56][57][58][59][60][61][62][63][64] oxynitrides, [65][66][67][68][69][70][71][72][73][74][75] oxysulfides, [76][77][78][79][80]…”

Section: Factors Affecting Photocatalytic Hydrogen Generationmentioning

confidence: 99%

Operational Conditions Affecting Hydrogen Production by the Photoreforming of Organic Compounds using Titania Nanoparticles with Gold

et al. 2018

View full text Add to dashboard Cite

Several factors affect photocatalytic hydrogen productivity from the photoreforming of organic compounds, which makes it difficult to optimize operational conditions in photoreactors. To prioritize these factors, we focused on the quantification of the effect of five of them on hydrogen production. Photocatalytic experiments were performed on 67 mL batch photoreactors under UV‐LED lamps (λ=375 nm) using a suspension of TiO2–Au nanoparticles synthesized by a sol–gel approach. The analyzed factors were: (A) presence of Au as a cocatalyst, (B) type of alcohol as the electron donor, (C) intensity of UV light, (D) electron donor concentration, and (E) nanoparticle concentration. A main and interaction effects analysis is presented with reduced fixed effect models for three responses: total hydrogen generation, catalyst productivity, and electron donor productivity. The presence of Au as a cocatalyst (A), the intensity of UV light (C), and their interaction (AC) were the factors with the highest effect. The best configuration allowed us to reach a catalyst productivity of 2925 μmolnormalH2 g−1 h−1.

show abstract

“…Vanadium oxide-based materials are important industrial catalysts employed in myriad applications. Vanadium oxide in catalytic applications is typically present as a minority phase supported atop another oxide material (the support) with a high surface area, and it has shown effectiveness in chemical conversions ranging from oxidative dehydrogenation (ODH) of alkanes and alcohols, , SO 2 oxidation, o -xylene oxidation, selective catalytic reduction (SCR) of nitrogen oxides, and photocatalytic conversion of alcohols . In its pentavalent state, surface vanadia species that favorably catalyze photo/thermochemical conversion occupy structural and coordinative configurations dissimilar to their bulk polycrystalline V 2 O 5 molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Impact of Hydration on Supported V₂O₅/TiO₂ Catalysts as Explored by Magnetic Resonance Spectroscopy

Jaegers

Wang

et al. 2021

J. Phys. Chem. C

View full text Add to dashboard Cite

Supported vanadium oxide catalysts are important industrial materials for a wide array of chemical transformations. The condition of surface hydration is of particular interest as a reflection of the state of freshly manufactured catalysts prior to their activation in catalytic reactors or under the conditions of photocatalysis where surface vanadia are exposed to moisture. Under such conditions, the surface vanadia species undergo structural changes, as evidenced by 51V magic-angle spinning nuclear magnetic resonance (51V MAS NMR) in this study. For low surface vanadia densities on titania, a modest trend toward the formation of dimeric and oligomeric vanadia species was observed under hydrated conditions when compared to the corresponding dehydrated catalyst, which contains a large abundance of monomeric vanadia species. The incorporation of tungsten oxide into the V2O5/TiO2 catalyst with low surface vanadia density, however, is found to better stabilize the surface vanadia species on the titania support upon hydration than its tungsta-free counterpart. This stabilization is not an intrinsic property of more extensively oligomerized surface vanadia species in the presence of tungsten oxide, which is evidenced by the conditions of high concentrations of surface vanadia oligomers on titania that exhibit dramatic structural changes upon hydration. At high surface vanadia coverage under hydrated environments, the simultaneous observation of polycrystalline V2O5 nanoparticles and a mobile phase of surface vanadia species is apparent, where vanadia species are dissolved in a thin hydration layer on the titania support. These new findings have broad implications on the behavior of other metal-oxide species on high surface oxide supports under hydrated conditions.

show abstract

Photocatalytic production of hydrogen by vanadium oxides under visible light irradiation

Cited by 48 publications

References 40 publications

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

Operational Conditions Affecting Hydrogen Production by the Photoreforming of Organic Compounds using Titania Nanoparticles with Gold

Impact of Hydration on Supported V₂O₅/TiO₂ Catalysts as Explored by Magnetic Resonance Spectroscopy

Contact Info

Product

Resources

About

Photocatalytic production of hydrogen by vanadium oxides under visible light irradiation

Cited by 48 publications

References 40 publications

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

Growth, Structure, and Photocatalytic Properties of Hierarchical V2O5–TiO2 Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti–V Alloys

Operational Conditions Affecting Hydrogen Production by the Photoreforming of Organic Compounds using Titania Nanoparticles with Gold

Impact of Hydration on Supported V2O5/TiO2 Catalysts as Explored by Magnetic Resonance Spectroscopy

Contact Info

Product

Resources

About

Impact of Hydration on Supported V₂O₅/TiO₂ Catalysts as Explored by Magnetic Resonance Spectroscopy