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Title: Interfacial charge-transfer process across ZrO 2 -TiO 2 heterojunction and its impact on photocatalytic activity

Authors:
; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1411462
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Photochemistry and Photobiology. A, Chemstry
Additional Journal Information:
Journal Volume: 335; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-06 01:41:47; Journal ID: ISSN 1010-6030
Publisher:
Elsevier
Country of Publication:
Switzerland
Language:
English

Citation Formats

Guerrero-Araque, Diana, Ramírez-Ortega, David, Acevedo-Peña, Próspero, Tzompantzi, Francisco, Calderón, Héctor A., and Gómez, Ricardo. Interfacial charge-transfer process across ZrO 2 -TiO 2 heterojunction and its impact on photocatalytic activity. Switzerland: N. p., 2017. Web. doi:10.1016/j.jphotochem.2016.11.030.
Guerrero-Araque, Diana, Ramírez-Ortega, David, Acevedo-Peña, Próspero, Tzompantzi, Francisco, Calderón, Héctor A., & Gómez, Ricardo. Interfacial charge-transfer process across ZrO 2 -TiO 2 heterojunction and its impact on photocatalytic activity. Switzerland. doi:10.1016/j.jphotochem.2016.11.030.
Guerrero-Araque, Diana, Ramírez-Ortega, David, Acevedo-Peña, Próspero, Tzompantzi, Francisco, Calderón, Héctor A., and Gómez, Ricardo. Wed . "Interfacial charge-transfer process across ZrO 2 -TiO 2 heterojunction and its impact on photocatalytic activity". Switzerland. doi:10.1016/j.jphotochem.2016.11.030.
@article{osti_1411462,
title = {Interfacial charge-transfer process across ZrO 2 -TiO 2 heterojunction and its impact on photocatalytic activity},
author = {Guerrero-Araque, Diana and Ramírez-Ortega, David and Acevedo-Peña, Próspero and Tzompantzi, Francisco and Calderón, Héctor A. and Gómez, Ricardo},
abstractNote = {},
doi = {10.1016/j.jphotochem.2016.11.030},
journal = {Journal of Photochemistry and Photobiology. A, Chemstry},
number = C,
volume = 335,
place = {Switzerland},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jphotochem.2016.11.030

Citation Metrics:
Cited by: 10works
Citation information provided by
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  • Graphical abstract: The Pt loading on the synthesized mesoporous-assembled 0.95TiO{sub 2}–0.05ZrO{sub 2} mixed oxide nanocrystal photocatalyst was comparatively investigated by two methods: single-step sol–gel (SSSG) and photochemical deposition (PCD). The Pt loading by the PCD method was found to be superior to that by the SSSG method in enhancing photocatalytic sensitized hydrogen production under visible light irradiation. The Pt loading amount and PCD conditions, i.e. light irradiation time and light intensity, also had a strong effect on the photocatalytic hydrogen production activity. Highlights: ► Pt-loaded mesoporous-assembled 0.95TiO{sub 2}–0.05ZrO{sub 2} nanocrystals were synthesized. ► Pt loading was performed by single-step sol–gelmore » and photochemical deposition. ► Pt loading by photochemical deposition more enhanced photocatalytic H{sub 2} production. ► Pt loading amount and photochemical deposition conditions were optimized. -- Abstract: In this work, the photocatalytic water splitting under visible light irradiation for hydrogen production was investigated by using Eosin Y-sensitized Pt-loaded mesoporous-assembled TiO{sub 2}–ZrO{sub 2} mixed oxide nanocrystal photocatalysts. The mesoporous-assembled TiO{sub 2}–ZrO{sub 2} mixed oxide with the TiO{sub 2}-to-ZrO{sub 2} molar ratio of 95:5 (i.e. 0.95TiO{sub 2}–0.05ZrO{sub 2}) was synthesized by using a sol–gel process with the aid of a structure-directing surfactant. The Pt loading was comparatively performed via two different effective methods: single-step sol–gel (SSSG) and photochemical deposition (PCD). The synthesized photocatalysts were methodically characterized by N{sub 2} adsorption–desorption, XRD, UV–visible spectroscopy, SEM–EDX, TEM–EDX, TPR, and H{sub 2} chemisorption analyses. The results revealed that the Pt loading by the PCD method greatly enhanced the photocatalytic hydrogen production activity of the synthesized mesoporous-assembled 0.95TiO{sub 2}–0.05ZrO{sub 2} mixed oxide photocatalyst more than that by the SSSG method. The optimum Pt loading by the PCD method was experimentally observed at 0.5 wt.%, which was well associated with the maximum Pt dispersion. In addition, the PCD conditions, i.e. UV light irradiation time and UV light intensity, were investigated and optimized to be 2 h and 44 W, respectively.« less
  • Highlights: ► Bi{sub 2}S{sub 3} was doped into TiO{sub 2} and it was clearly proved by the expander of the crystalline lattice in XRD result. ► As-prepared TiO{sub 2}/Bi{sub 2}S{sub 3} heterojunctions have a nuclear-shell structure which has not been reported. ► As-prepared TiO{sub 2}/Bi{sub 2}S{sub 3} heterojunctions have the excellent photocatalytic activity. -- Abstract: TiO{sub 2}/Bi{sub 2}S{sub 3} heterojunctions with a nuclear-shell structure were prepared by the coprecipitation method. The products were characterized by X-ray diffraction analysis, Raman spectra, transmission electron microscope images and energy dispersion X-ray spectra. Results showed that as-prepared Bi{sub 2}S{sub 3} was urchin-like, made frommore » many nanorods, and TiO{sub 2}/Bi{sub 2}S{sub 3} heterojunctions have a similar nuclear-shell structure, with Bi{sub 2}S{sub 3} as the shell and TiO{sub 2} as the nuclear. The photocatalytic experiments performed under UV irradiation using methyl orange as the pollutant revealed that the photocatalytic activity of TiO{sub 2} could be improved by introduction of an appropriate amount of Bi{sub 2}S{sub 3}. However, excessive amount of Bi{sub 2}S{sub 3} would result in the decrease of photocatalytic activity of TiO{sub 2}. The relative mechanism was proposed.« less
  • Highlights: Black-Right-Pointing-Pointer A new insight for further improving photoactivity of MWCNT/TiO{sub 2} was reported. Black-Right-Pointing-Pointer The Pd as charge transfer channel trap electrons from MWCNT to TiO{sub 2} surface. Black-Right-Pointing-Pointer The Pd content can also influence photoactivity of MWCNT/TiO{sub 2} photocatalyst. Black-Right-Pointing-Pointer The approach is practically usable for other nanocarbon/semiconductor materials. -- Abstract: A surface bond-grafted multi-walled carbon nanotube (MWCNT)/TiO{sub 2} as supporter, palladium nanoparticles, approximately 3 nm in diameter, are uniformly deposited on the functional MWCNT surface in first, constructing a novel Pd-MWCNT/TiO{sub 2} photocatalyst for photocatalytic solar conversion. The characterization of photocatalysts by a series of joint techniques,more » including BET surface area, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), Raman spectroscopy and ultraviolet/visible (UV/vis) diffuse reflectance spectra, discloses that palladium nanoparticles has a crucial role in enhancement of photocatalytic activity of MWCNT/TiO{sub 2}, that is to act as a charge transfer channel, which helps to trap electrons from MWCNT to TiO{sub 2}.« less
  • The formation of hollow binary ZrO{sub 2}/TiO{sub 2} oxide fibers using mixed precursor solutions was achieved by activated carbon fibers templating technique combined with solvothermal process. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), N{sub 2} adsorption, X-ray photoelectron spectroscopy (XPS), UV-vis, and infrared (IR) spectroscopy. The binary oxide system shows the anatase-type TiO{sub 2} and tetragonal phase of ZrO{sub 2}, and the introduction of ZrO{sub 2} notably inhibits the growth of TiO{sub 2} nanocrystallites. Although calcined at 575 deg. C, all hollow ZrO{sub 2}/TiO{sub 2} fibers exhibit higher surface areas (>113more » m{sup 2}/g) than pure TiO{sub 2} hollow fibers. The Pyridine adsorption on ZrO{sub 2}/TiO{sub 2} sample indicates the presence of stronger surface acid sites. Such properties bring about that the binary oxide system possesses higher efficiency and durable activity stability for photodegradation of gaseous ethylene and trichloromethane than P25 TiO{sub 2}. In addition, the macroscopic felt form for the resulting materials is more beneficial for practical applications than traditional catalysts forms. - Graphical abstract: The final ZrO{sub 2}/TiO{sub 2} products composed of hollow fibers are in the form of felt on the centimeter scale and possess certain strength and flexibleness. Moreover, they exhibit excellent efficiency and durable activity stability for photodegradation of gaseous ethylene and trichloromethane, reaching about 136% and 387% of the P25 activity after 10 h, respectively.« less
  • Coupled CuO-TiO{sub 2} nanocomposite photocatalysts were prepared by a deposition precipitation method and were characterized with a variety of techniques. Electron paramagnetic resonance (EPR) spectroscopy was employed to study the local structures of surface/interfacial Cu{sup 2+}+ sites using Cu{sup 2+} as a sensitive paramagnetic probe. The addition of bulk CuO to TiO{sub 2} led to decreased photocatalytic efficiency in the degradation of methylene blue. However, doping with a very small amount of CuO (0.1 wt % copper loading) significantly enhanced the photocatalytic activity of TiO{sub 2}. EPR study of the TiO{sub 2} surface revealed the presence of both highly dispersedmore » CuO clusters and substitutional Cu{sup 2+} sites (Ti-O-Cu linkages) at 0.1 wt % copper loading. The data suggest that the Ti-O-Cu linkages contributed to the improved photooxidative activity of the 0.1% CuO-TiO{sub 2} nanocomposite. In contrast, at higher loadings the bulk form of CuO created charge recombination centers lowering the photoactivity of the composites.« less