Oxygen vacancies mediated in-situ growth of noble-metal (Ag, Au, Pt) nanoparticles on 3D TiO2 hierarchical spheres for efficient photocatalytic hydrogen evolution from water splitting

Hu, Haihua; Qian, Degui; Lin, Ping; Ding, Zixuan; Cui, Can

doi:10.1016/j.ijhydene.2019.10.231

Cited by 67 publications

(18 citation statements)

References 42 publications

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“…the vacuum level) over the S-M interface till an equalized Fermi potential (eqs S1 and S2). ,− The analyses illustrate that the possible introduction of a Schottky junction with a well-detectable energy barrier height will result in a larger driving force toward creating hindrances in hot electron back-transfer. Furthermore, the phenomenal contact will enforce the development of positive–negative charge layers (semiconductor: +ve / metal: −ve) across the interface area, provoking elevated exciton pair separation.…”

Section: Results and Discussionmentioning

confidence: 99%

Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

2021

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Crystal facet engineering, a trending technique to acquire superior exciton pair anti-recombination and interfacial charge pair separation via an inherent functional exposed facet isotype junction, is the current research hotspot. Selectively controlling facet exposure factor with Schottky energy barrier architecture across discerned exposed functional facet attested to facilitate electron injection-separation via a shorter barrier height and closer surface distance. In this context, a {040/110}-BiVO 4 @Ag@CoAl-LDH Z-scheme isotype heterostructure with elevated {040} facet exposure factor tailored a {040/110} crystal facet isotype junction, and {040}-BiVO 4 functional facet/metallic Ag 0 nano-island semiconductor−metal selective Schottky contact was fabricated meticulously via a three-step reflux, photoreduction, followed by an in situ coprecipitation method. Inherent attribution of crystal facet isotype junction and minor semiconductor−metal Schottky barrier toward the nature of exciton pair separation and elevated photoredox activity was neatly demonstrated and well inferred, which is the novelty of the present research. The ternary isotype heterostructure corroborates impressive gemifloxacin detoxification (89.72%, 90 min) and O 2 generation (768 μmol, 120 min), which are multiple folds that of respective pure and binary isotype heterostructures. The bottom-up photoredox activity was well ascribed to shorter Schottky barrier hot electron channelization provoked superior exciton pair separation and well attested via linear sweep voltammetry (315 μA), photoluminescence, electrochemical impedance spectroscopy, Bode, carrier density, and transient photocurrent analysis. The research illustrates a novel insight and scientific basis for the rational design of crystal facet isotype junction and selective Schottky contact vectorial electron shuttling promoted Z-scheme charge transfer dynamics isotype heterostructure systems toward photocatalytic energy-environmental remediation.

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Section: Results and Discussionmentioning

confidence: 99%

Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

2021

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“…Based on this observation, we propose the following explanation. As displayed in Scheme , under the full spectrum, some Pt NPs will produce a strong SPR effect after absorbing UV light. − The produced hot electrons are either injected into g-C 3 N 4 , or combined with H + to generate 1/2H 2 , − thereby leaving a positive charge on the surface of Pt NPs. Some other Pt NPs do not have a plasmon resonance effect but acquire photoelectrons from g-C 3 N 4 so that the surface of these Pt NPs is negatively charged. − Then, the positively charged and negatively charged Pt NPs will attract each other, thus accelerating the process of thermal agglomeration.…”

Section: Resultsmentioning

confidence: 99%

Temperature-Induced Variations in Photocatalyst Properties and Photocatalytic Hydrogen Evolution: Differences in UV, Visible, and Infrared Radiation

Lin

et al. 2021

ACS Sustainable Chem. Eng.

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In this work, solar-heating-induced temperature-based photocatalytic hydrogen evolution reaction (PC-HER) of different photocatalysts (TiO 2 P25, g-C 3 N 4 , and their loaded Pt) was comprehensively studied and analyzed with the assistance of a series of temperature-based in situ characterizations. It was found that pristine TiO 2 P25 and g-C 3 N 4 displayed enhanced PC-HER performances with increasing temperature (25−65 °C), while their loaded Pt nanoparticles (NPs) demonstrated a different behavior under ultraviolet (UV) or visible irradiation, presenting the highest hydrogen evolution rate at 35 °C. More interestingly, Pt NPs-g-C 3 N 4 showed increasing PC-HER performances from 25 to 65 °C under visible light irradiation. Characterizations suggested that lowered electrical impedance, reduced band gap, increased light absorption, and elongated photoelectron lifetime with increased temperature are beneficial for improved PC-HER. However, agglomeration of Pt NPs significantly deteriorated the PC-HER performance at higher temperature and UV light can aggravate the thermal agglomeration of Pt NPs.

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“…Therefore, the presence of this narrow ESR peak in the case of the photocatalysts formed on sol–gel supports by H 2 treatment (not shown) is not surprising. In fact, several authors in the literature assume that the oxygen vacancies responsible for the sharp ESR signal at g ≈ 2.00 may influence the surface redox properties of the TiO 2 materials [ 74 , 75 , 76 , 77 , 78 ]. As such vacancies are detectable in the sol–gel supports even after preparation at 500 °C, but are missing from the P25 TiO 2 , their influence on the surface chemical properties can indeed explain some of the XPS observations, although microstructural differences as well as the always higher overall disorder of the sol–gel materials should also be considered.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Microstructure of the Semiconductor Support on the Photocatalytic Performance of the Pt-PtOx/TiO2 Catalyst System

et al. 2021

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The influence of the semiconductor microstructure on the photocatalytic behavior of Pt-PtOx/TiO2 catalysts was studied by comparing the methanol-reforming performance of systems based on commercial P25 or TiO2 from sol–gel synthesis calcined at different temperatures. The Pt co-catalyst was deposited by incipient wetness and formed either by calcination or high-temperature H2 treatment. Structural features of the photocatalysts were established by X-ray powder diffraction (XRD), electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), optical absorption, Raman spectroscopy and TEM measurements. In situ reduction of Pt during the photocatalytic reaction was generally observed. The P25-based samples showed the best H2 production, while the activity of all sol–gel-based samples was similar in spite of the varying microstructures resulting from the different preparation conditions. Accordingly, the sol–gel-based TiO2 has a fundamental structural feature interfering with its photocatalytic performance, which could not be improved by annealing in the 400–500 °C range even by scarifying specific surface area at higher temperatures.

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Oxygen vacancies mediated in-situ growth of noble-metal (Ag, Au, Pt) nanoparticles on 3D TiO2 hierarchical spheres for efficient photocatalytic hydrogen evolution from water splitting

Cited by 67 publications

References 42 publications

Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

Temperature-Induced Variations in Photocatalyst Properties and Photocatalytic Hydrogen Evolution: Differences in UV, Visible, and Infrared Radiation

Effect of the Microstructure of the Semiconductor Support on the Photocatalytic Performance of the Pt-PtOx/TiO2 Catalyst System

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Oxygen vacancies mediated in-situ growth of noble-metal (Ag, Au, Pt) nanoparticles on 3D TiO2 hierarchical spheres for efficient photocatalytic hydrogen evolution from water splitting

Cited by 67 publications

References 42 publications

Discriminatory {040}-Reduction Facet/Ag0Schottky Barrier Coupled {040/110}-BiVO4@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

Discriminatory {040}-Reduction Facet/Ag0Schottky Barrier Coupled {040/110}-BiVO4@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

Temperature-Induced Variations in Photocatalyst Properties and Photocatalytic Hydrogen Evolution: Differences in UV, Visible, and Infrared Radiation

Effect of the Microstructure of the Semiconductor Support on the Photocatalytic Performance of the Pt-PtOx/TiO2 Catalyst System

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Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure

Discriminatory {040}-Reduction Facet/Ag⁰Schottky Barrier Coupled {040/110}-BiVO₄@Ag@CoAl-LDH Z-Scheme Isotype Heterostructure