Photoinduced Glycerol Oxidation over Plasmonic Au and AuM (M = Pt, Pd and Bi) Nanoparticle-Decorated TiO2 Photocatalysts

Jedsukontorn, Trin; Saito, Nagahiro; Hunsom, Mali

doi:10.3390/nano8040269

Cited by 22 publications

(12 citation statements)

References 79 publications

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“…Five binding energy ranges corresponding to the Ti 2p, O 1s, C 1s, N 1s, and Si 2p orbitals are presented. The two binding energies of 459.4 and 465.1 eV are assignable to Ti 2p 3/2 and 2p 1/2 orbital electrons, respectively, bonded to oxygen (Ti–O) [29,30]. The two binding energies of 528.4 and 531.0 eV can be assigned to the O 1s orbital electrons linked to titanium (O–Ti) and hydrogen (O–H) in the hydroxy group, respectively [31,32].…”

Section: Resultsmentioning

confidence: 99%

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Tanabe

Nagai

et al. 2019

Materials

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Photo-induced super-hydrophilic thin films were fabricated on a quartz glass substrate by ultraviolet (UV) irradiation of a molecular precursor film at room temperature. A molecular precursor film exhibiting high solubility to both ethanol and water was obtained by spin-coating a solution involving a Ti(IV) complex; this complex was prepared by the reaction of Ti(IV) alkoxide with butylammonium hydrogen oxalate and hydrogen peroxide in ethanol. Transparent and well-adhered amorphous thin films of 160–170 nm thickness were obtained by weak UV irradiation (4 mW·cm−2 at 254 nm) of the precursor films for over 4 h at room temperature. The resultant thin films exhibiting low refractive indices of 1.78–1.79 were mechanically robust and water-insoluble. The chemical components of the thin films were examined by means of Fourier transform-infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) spectra, focusing on the presence of the original ligands. The super-hydrophilic properties (evaluated based on the water contact angles on the surfaces) of the thin films after being kept in a dark condition overnight emerged when the aforementioned UV-light irradiation was performed for 10 min. It was additionally clarified that the super-hydrophilicity can be photo-induced repeatedly by UV irradiation for 10 min (indicated by a contact angle smaller than 4°) even after the hydrophilic level of the thin films had once been lowered by being in a dark condition for 4 h.

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Section: Resultsmentioning

confidence: 99%

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Tanabe

Nagai

et al. 2019

Materials

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“…It must also be noted that the LSPR resonance observed by Bian et al [ 254 ] was quite broad—implying a low Q-factor for the resonance, and the resulting weak local field amplification factor might have also contributed to the low quantum yields obtained. Hunsom et al obtained a tripling in the rate of photoinduced glycerol oxidation by using Au NP-decorated TiO 2 photocatalysts instead of bare TiO 2 [ 255 ]. Further improvements in catalytic activity for glycerol photo-oxidation were achieved using bimetallic AuPd, AuPt, and AuBi NP/TiO 2 heterojunctions with AuPd/TiO 2 producing the highest performance which was attributed to optimal light harvesting and efficient charge separation [ 255 ].…”

Section: Exploiting Hot Electronsmentioning

confidence: 99%

“…Hunsom et al obtained a tripling in the rate of photoinduced glycerol oxidation by using Au NP-decorated TiO 2 photocatalysts instead of bare TiO 2 [ 255 ]. Further improvements in catalytic activity for glycerol photo-oxidation were achieved using bimetallic AuPd, AuPt, and AuBi NP/TiO 2 heterojunctions with AuPd/TiO 2 producing the highest performance which was attributed to optimal light harvesting and efficient charge separation [ 255 ].…”

Section: Exploiting Hot Electronsmentioning

confidence: 99%

Hot Electrons in TiO2–Noble Metal Nano-Heterojunctions: Fundamental Science and Applications in Photocatalysis

Manuel

Shankar

2021

Nanomaterials

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Plasmonic photocatalysis enables innovation by harnessing photonic energy across a broad swathe of the solar spectrum to drive chemical reactions. This review provides a comprehensive summary of the latest developments and issues for advanced research in plasmonic hot electron driven photocatalytic technologies focusing on TiO2–noble metal nanoparticle heterojunctions. In-depth discussions on fundamental hot electron phenomena in plasmonic photocatalysis is the focal point of this review. We summarize hot electron dynamics, elaborate on techniques to probe and measure said phenomena, and provide perspective on potential applications—photocatalytic degradation of organic pollutants, CO2 photoreduction, and photoelectrochemical water splitting—that benefit from this technology. A contentious and hitherto unexplained phenomenon is the wavelength dependence of plasmonic photocatalysis. Many published reports on noble metal-metal oxide nanostructures show action spectra where quantum yields closely follow the absorption corresponding to higher energy interband transitions, while an equal number also show quantum efficiencies that follow the optical response corresponding to the localized surface plasmon resonance (LSPR). We have provided a working hypothesis for the first time to reconcile these contradictory results and explain why photocatalytic action in certain plasmonic systems is mediated by interband transitions and in others by hot electrons produced by the decay of particle plasmons.

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“…In most cases, it is found that noble metal nanoparticles (NPs) play an essential role in promoting the dissociation of polyols, which served as an electron donor in hydrogen production or as an reactant in chemical synthesis. − Several research groups have tried to unravel the promotional mechanisms of metal NPs and proposed that the enhanced charge storage and transfer kinetics account for the enhanced catalytic performance. − In addition, some metal NPs extend the light absorption of the photocatalysts into the visible light region owing to their plasmonic effect, which also benefits the polyol conversion to some extent. − Mechanisms of catalytic polyol dissociation have also been proposed on the basis of global kinetics. Lercher and co-authors have studied the photoreforming of ethylene glycol using both Rh/TiO 2 and Rh/GaN/ZnO photocatalysts .…”

Section: Introductionmentioning

confidence: 99%

Effect of Pd and Au on Hydrogen Abstraction and C–C Cleavage in Photoconversion of Glycerol: Beyond Charge Separation

Lei

Zhang

et al. 2020

J. Phys. Chem. C

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Photocatalytic conversion of polyols to value-added products is of great interest for the utilization of biomass as a chemical feedstock. Current research focuses on boosting the reaction rate and selectivity by employing metal nanoparticles (NPs) as charge separators and cocatalysts. However, the promotional role of metal NPs in such photocatalytic processes still remains unclear because of the lack of mechanistic understanding. Here, we have explored the role of supported Pd and Au NPs on TiO 2 in photocatalytic glycerol conversion under water-free, deaerated conditions by in situ spectroscopic methods. While the presence of Au NPs only results in partial conversion of glycerol at a low rate, Pd decoration promotes glycerol oxidation to a much higher conversion. In situ mass and vibrational spectrometry reveals that Pd/TiO 2 exhibits faster cleavage of O−H and C−H bonds in both glycerol and the derived intermediates as compared to Au/TiO 2 , thus leading to a higher glycerol conversion accompanied by the formation of additional molecular hydrogen. X-ray photoelectron spectroscopy suggests that the preferential adsorption of glycerol on the surface of Pd via hydroxyl groups results in an enhanced interfacial charge transfer, thus yielding a better photocatalytic activity.

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Photoinduced Glycerol Oxidation over Plasmonic Au and AuM (M = Pt, Pd and Bi) Nanoparticle-Decorated TiO2 Photocatalysts

Cited by 22 publications

References 79 publications

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Hot Electrons in TiO2–Noble Metal Nano-Heterojunctions: Fundamental Science and Applications in Photocatalysis

Effect of Pd and Au on Hydrogen Abstraction and C–C Cleavage in Photoconversion of Glycerol: Beyond Charge Separation

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