Probing the charge separation process on In2S3/Pt-TiO2 nanocomposites for boosted visible-light photocatalytic hydrogen production

Fenglong Wang; Zuanming Jin; Yijiao Jiang; Ellen H. G. Backus; Mischa Bonn; Shi Nee Lou; Dmitry Turchinovich; Rose Amal

doi:10.1016/j.apcatb.2016.05.048

Probing the charge separation process on In2S3/Pt-TiO2 nanocomposites for boosted visible-light photocatalytic hydrogen production

Fenglong Wang, Zuanming Jin, Yijiao Jiang, Ellen H. G. Backus, Mischa Bonn, Shi Nee Lou, Dmitry Turchinovich, Rose Amal

School of Engineering

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favouring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 ps. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts.

Original language	English
Pages (from-to)	25-31
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	198
DOIs	https://doi.org/10.1016/j.apcatb.2016.05.048
Publication status	Published - 5 Dec 2016

Keywords

Hydrogen generation
In2S3/Pt-TiO2
Visible-light photocatalysis
Charge transfer and separation
Optical pump-terahertz probe spectroscopy

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10.1016/j.apcatb.2016.05.048

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@article{6546ceaccc154ddb93a9d71a80d9e310,

title = "Probing the charge separation process on In2S3/Pt-TiO2 nanocomposites for boosted visible-light photocatalytic hydrogen production",

abstract = "A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favouring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 ps. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts. ",

keywords = "Hydrogen generation, In2S3/Pt-TiO2, Visible-light photocatalysis, Charge transfer and separation, Optical pump-terahertz probe spectroscopy",

author = "Fenglong Wang and Zuanming Jin and Yijiao Jiang and Backus, \{Ellen H. G.\} and Mischa Bonn and Lou, \{Shi Nee\} and Dmitry Turchinovich and Rose Amal",

year = "2016",

month = dec,

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doi = "10.1016/j.apcatb.2016.05.048",

language = "English",

volume = "198",

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journal = "Applied Catalysis B: Environmental",

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publisher = "Elsevier",

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TY - JOUR

T1 - Probing the charge separation process on In2S3/Pt-TiO2 nanocomposites for boosted visible-light photocatalytic hydrogen production

AU - Wang, Fenglong

AU - Jin, Zuanming

AU - Jiang, Yijiao

AU - Backus, Ellen H. G.

AU - Bonn, Mischa

AU - Lou, Shi Nee

AU - Turchinovich, Dmitry

AU - Amal, Rose

PY - 2016/12/5

Y1 - 2016/12/5

N2 - A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favouring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 ps. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts.

AB - A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favouring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 ps. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts.

KW - Hydrogen generation

KW - In2S3/Pt-TiO2

KW - Visible-light photocatalysis

KW - Charge transfer and separation

KW - Optical pump-terahertz probe spectroscopy

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U2 - 10.1016/j.apcatb.2016.05.048

DO - 10.1016/j.apcatb.2016.05.048

M3 - Article

SN - 0926-3373

VL - 198

SP - 25

EP - 31

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Probing the charge separation process on In2S3/Pt-TiO2 nanocomposites for boosted visible-light photocatalytic hydrogen production

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Keywords

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