The Surface‐Structure Sensitivity of Dioxygen Activation in the Anatase‐Photocatalyzed Oxidation Reaction

Zhao, Yubao; Ma, Wanhong; Li, Y.; Ji, Hongwei; Chen, C.; Zhu, Hua; Zhao, Jincai

doi:10.1002/ange.201107149

Cited by 36 publications

(34 citation statements)

References 38 publications

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“…It is also known that these radicals can react with TA to form 2-hydroxy terephthalic acid (TAOH), which emits a characteristic fluorescence at 426 nm. 21,24 Fig . 4 shows the TAOH fluorescence signals arising upon irradiation of a Ba 5 Ta 4 O 15 /Ba 3 Ta 5 O 15 composite suspension in TA-NaOH with a 150 W xenon immersion lamp.…”

Section: Photocatalytic Resultsmentioning

confidence: 94%

“…6,21 At first, we tested our photocatalyst materials without any cocatalyst in water containing ∼10% MeOH. All three materials are active without any deposited co-catalyst as shown in Fig.…”

Section: Photocatalytic Resultsmentioning

confidence: 99%

“…Upon irradiation, the photogenerated˙OH radicals react with TA to form 2-hydroxyterephthalic acid (TAOH), which shows a characteristic fluorescence band at 426 nm. 21 An increase in intensity with time is thereby directly related to an increased amount of photogenerated˙OH radicals. The applied excitation wavelength was set to 320 nm.…”

Section: Photocatalytic Activity Testsmentioning

confidence: 99%

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Enhanced photocatalytic hydrogen generation from barium tantalate composites

Marschall

Soldat

Wark

2013

Photochem Photobiol Sci

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(111)-layered Ba5Ta4O15 photocatalysts were synthesised by a solid state reaction route and a citrate synthesis route, and their structural and electronic properties were investigated. After citrate route preparation, the presence of a second phase, namely Ba3Ta5O15, was determined by X-ray powder diffraction and absorption spectroscopy. The existence of this phase had a profound effect on the photocatalytic activity of this Ba5Ta4O15/Ba3Ta5O15 composite in comparison to the pure Ba5Ta4O15 materials. The photocatalytic performance of the barium tantalates was evaluated by investigating the capability in ˙OH radical formation and hydrogen generation. Strongly increased hydrogen evolution rates for the Ba5Ta4O15/Ba3Ta5O15 composite, up to 160% higher than for the pure Ba5Ta4O15, were determined, and only very small amounts of Rh co-catalyst, deposited on the photocatalysts by stepwise reductive photo-deposition, were needed to achieve these results.

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Section: Photocatalytic Resultsmentioning

confidence: 94%

Section: Photocatalytic Resultsmentioning

confidence: 99%

Section: Photocatalytic Activity Testsmentioning

confidence: 99%

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Enhanced photocatalytic hydrogen generation from barium tantalate composites

Marschall

Soldat

Wark

2013

Photochem Photobiol Sci

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“…,show high dependencyo nt he structure or location of OVs, thus potentially affecting organic pollutant removal efficiency, organic transformation selectivity,a nd CO oxidation pathways. [14][15][16] Water chemistry on oxide surfaces can also be prominently modified by OVs, which enable water dissociation at low coverage,t he key kinetic step for water splitting. [17,18] With regard to photochemical conversion of greenhouse gas CO 2 into solar fuels,OVs favor the CO 2 binding and subsequent activation to CCO 2 À ,a sw ell as the final dissociation to CO. CCO 2 À is often considered as the key intermediate with high formation energy during the photocatalytic CO 2 reduction.…”

Section: àmentioning

confidence: 99%

Oxygen Vacancy‐Mediated Photocatalysis of BiOCl: Reactivity, Selectivity, and Perspectives

et al. 2017

Angew Chem Int Ed

987

428

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Semiconductor photocatalysis is a trustworthy approach to harvest clean solar light for energy conversions, while state-of-the-art catalytic efficiencies are unsatisfactory because of the finite light response and/or recombination of robust charge carriers. Along with the development of modern material characterization techniques and electronic-structure computations, oxygen vacancies (OVs) on the surface of real photocatalysts, even in infinitesimal concentration, are found to play a more decisive role in determining the kinetics, energetics, and mechanisms of photocatalytic reactions. This Review endeavors to clarify the inherent functionality of OVs in photocatalysis at the surface molecular level using 2D BiOCl as the platform. Structure sensitivity of OVs on reactivity and selectivity of photocatalytic reactions is intensely discussed via confining OVs onto prototypical BiOCl surfaces of different structures. The critical understanding of OVs chemistry can help consolidate and advance the fundamental theories of photocatalysis, and also offer new perspectives and guidelines for the rational design of catalysts with satisfactory performance.

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“…[3,4] Titania photocatalysis, owing to its mild reaction conditions and the sustainability of the energy source (solar light) employed, has attracted intensive research interest and has been widely applied in the elimination of environmental pollutants, in organic synthesis, and in hydrogen evolution. [5][6][7][8][9][10] Among various applications, titania-photocatalyzed organic synthesis routes are especially appealing because of novel reaction mechanisms. Various types of these reactions have been realized through photocatalysis, such as oxidation, reduction, isomerization, and polymerization.…”

mentioning

confidence: 99%

Titania‐Photocatalyzed Transfer Hydrogenation Reactions with Methanol as a Hydrogen Source: Enhanced Catalytic Performance by Pd–Pt Alloy at Ambient Temperature

Zhao

Pan

et al. 2014

ChemCatChem

Self Cite

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Hydrogenation reactions are of great importance in scientific research and in industry productions. Herein, we designed a novel system to realize photocatalytic transfer hydrogenation by using solar light as the energy input and methanol as the hydrogen source. In this reaction, titania loaded with Pd–Pt bimetallic alloy nanocrystals as a cocatalyst exhibited photocatalytic performance that was remarkably superior to that exhibited by titania with Pd or Pt alone as the cocatalyst. This work has shed light on the rational design of multifunctional catalysts through selecting appropriate bimetallic alloys as efficient cocatalysts.

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The Surface‐Structure Sensitivity of Dioxygen Activation in the Anatase‐Photocatalyzed Oxidation Reaction

Cited by 36 publications

References 38 publications

Enhanced photocatalytic hydrogen generation from barium tantalate composites

Enhanced photocatalytic hydrogen generation from barium tantalate composites

Oxygen Vacancy‐Mediated Photocatalysis of BiOCl: Reactivity, Selectivity, and Perspectives

Titania‐Photocatalyzed Transfer Hydrogenation Reactions with Methanol as a Hydrogen Source: Enhanced Catalytic Performance by Pd–Pt Alloy at Ambient Temperature

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