Laser processing of TiO2 colloids for an enhanced photocatalytic water splitting activity

Filice, Simona; Compagnini, Giuseppe; Fiorenza, Roberto; Scirè, Salvatore; D’Urso, Luisa; Fragalà, Maria Elena; Russo, Paola; Fazio, Enza; Scalese, S.

doi:10.1016/j.jcis.2016.08.013

Cited by 43 publications

(45 citation statements)

References 42 publications

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“…In a typical procedure, TiO 2 suspensions are irradiated by a high-intensity pulsed laser with frequent repetition rates to produce the characteristic blue-black TiO 2 . The obtained TiO 2 nanoparticles enhanced the photocatalytic activities in decomposing an organic dye [31] and in a water splitting reaction [32].…”

Section: ••mentioning

confidence: 94%

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Reactivity of Trapped and Accumulated Electrons in Titanium Dioxide Photocatalysis

2017

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Electrons, photogenerated in conduction bands (CB) and trapped in electron trap defects (Ti ds ) in titanium dioxide (TiO 2 ), play crucial roles in characteristic reductive reactions. This review summarizes the recent progress in the research on electron transfer in photo-excited TiO 2 . Particularly, the reactivity of electrons accumulated in CB and trapped at Ti ds on TiO 2 is highlighted in the reduction of molecular oxygen and molecular nitrogen, and the hydrogenation and dehalogenation of organic substrates. Finally, the prospects for developing highly active TiO 2 photocatalysts are discussed.

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Section: ••mentioning

confidence: 94%

“…Facile laser ablation and processing techniques have been developed to introduce the defects into TiO 2 nanocrystals and colloids in liquid [31][32][33][34]. In a typical procedure, TiO 2 suspensions are irradiated by a high-intensity pulsed laser with frequent repetition rates to produce the characteristic blue-black TiO 2 .…”

Section: ••mentioning

confidence: 99%

Reactivity of Trapped and Accumulated Electrons in Titanium Dioxide Photocatalysis

2017

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“…Pulsed laser post‐processing (PLPP) strategies of support materials to prepare defect‐rich NPs is an emerging field in laser‐based synthesis research . The main goal is to understand and develop photon‐induced defect formation strategies and understand how different types and densities of defect sites contribute to the catalytic activity in different reaction scenarios.…”

Section: Future Prospects: Laser‐based Defect Engineeringmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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“…After LFL, the photocatalytic activity of P25 can be further enhanced. For example, the hydrogen production rate of irradiated P25 (≈30 mmol g −1 h −1 ) is about twice that of unirradiated P25 (Figure a) . In addition to P25, LFL is also able to increase the hydrogen production rate of rutile and anatase TiO 2 .…”

Section: Defect Engineering and Applicationsmentioning

confidence: 99%

“…For example, the hydrogenp roduction rate of irradiated P25 ( % 30 mmol g À1 h À1 )isa bout twice that of unirradiated P25 (Figure 13 a). [127] In addition to P25, LFL is also able to increaset he hydrogen production rate of rutile and anatase TiO 2 .T he defects of irradiated TiO 2 are durable, as deduced from the 15 %d ecrease in the hydrogen production rate after 150 min of successive UV light irradiation (Figure 13 b). The nanosecondl aser used in this experiment inevitably leads to the formation of some undesirable large TiO 2 SMSs.…”

mentioning

confidence: 90%

Recent Advances in Surfactant‐Free, Surface‐Charged, and Defect‐Rich Catalysts Developed by Laser Ablation and Processing in Liquids

Zhang

et al. 2017

ChemNanoMat

108

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For excellence in the synthesis of highly active metal and oxide catalysts, a newly emerging technique—laser synthesis and processing of colloids (LSPC)—is gaining increasing attention for catalytic applications, such as water splitting, fuel cells, and photodegradation of organic pollutants. The advantages of using LSPC‐synthesized metal catalysts have been reviewed elsewhere [Chem. Rev. 2017, 117, 3990–4103]. Herein, current challenges related to the properties (surface chemistry and particle evolution) of metal catalysts synthesized by laser ablation in liquids/laser processing in liquids are discussed. The main focus is on the advantages of LSPC in surfactant‐free defect engineering of oxide nanoparticles. Compared with other techniques (e.g., hydrogenation), LSPC provides a unique platform to simultaneously introduce oxygen vacancies and surface disorders into oxide (e.g., TiO2) nanomaterials; thus allowing narrowing of the band gap from both conduction and valence bands. Defect‐rich oxides have versatile uses, such as being directly applied as photocatalysts and as building blocks to construct supported, doped, and ternary oxide photocatalysts for electrochemical and photocatalytic applications. The LSPC‐synthesized catalysts are promising for applications as commercial catalysts in light of their higher activities than those of current Pt/C and P25 TiO2 commercial catalysts.

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Laser processing of TiO2 colloids for an enhanced photocatalytic water splitting activity

Cited by 43 publications

References 42 publications

Reactivity of Trapped and Accumulated Electrons in Titanium Dioxide Photocatalysis

Reactivity of Trapped and Accumulated Electrons in Titanium Dioxide Photocatalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Recent Advances in Surfactant‐Free, Surface‐Charged, and Defect‐Rich Catalysts Developed by Laser Ablation and Processing in Liquids

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