Influence of the form of photodeposited platinum on titania upon its photocatalytic activity in CO and acetone oxidation

Vorontsov, Alexander V.; Savinov, E. N.; Jin, Zhensheng

doi:10.1016/s1010-6030(99)00073-8

Cited by 131 publications

(61 citation statements)

References 30 publications

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“…The formation of metal (Cu) and semiconductor (TiO 2 ) produces a high Schottky barrier that facilitates electron capture by the metal. Vorontsov reported that PtTiO 2 has the highest Schottky barrier and a longer electron-hole separation time [12,13]. Similarly, the Cu-TiO 2 contact in the present work might lengthen the lifetime of electron-hole pair separation and allow enough time for electrons to migrate into the metal and transport through the copper bridge.…”

Section: Introductionmentioning

confidence: 48%

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

Rahman¹,

Rokhmat²,

Yuliza³

et al. 2016

Int J Energy Environ Eng

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We propose a solar cell design using the combination of titanium dioxide (TiO 2 ) and graphite as active photon absorbing materials. TiO 2 absorbs photons of nearly ultraviolet wavelengths to produce electron-hole pairs, while graphite is expected to absorb photons of longer wavelengths. Although many authors have claimed that graphite is a semimetal, we observed that a model of a solar cell containing TiO 2 only as the active material behaves exactly the same as a model containing graphite only as the active material. Additionally, we observed that a model of a solar cell made using a composite of TiO 2 and graphite as the active material had much higher efficiency than solar cells made using TiO 2 -or graphite-only active materials. Although the highest efficiency we report here is approximately 1 %, our proposed solar cell structure is promising for mass application, especially in low-income settings, owing to its easy and flexible fabrication, and easy largescale application.

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Section: Introductionmentioning

confidence: 48%

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

Rahman¹,

Rokhmat²,

Yuliza³

et al. 2016

Int J Energy Environ Eng

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“…Numerous investigations have reported that it is an effective method to add Group VIII metals to TiO 2 -based photocatalytic systems to enhance the photocatalytic reaction rate (Serpone and Pelizzetti, 1989;Yang et al, 1997;Vorontsov et al, 2000). In previous studies, one of the most active metals for photocatalytic enhancement is platinum (Pt), which can produce the highest Schottky barrier among the metals that facilitate electron capture (Vorontsov et al, 1999). The capture of electrons by Pt is postulated to produce a longer electron-hole pair separation lifetime, and therefore hinder the recombination of electron/hole pairs and enhance the transfer of holes and possibly electrons to O 2 adsorbed on the TiO 2 surface.…”

Section: Introductionmentioning

confidence: 99%

The enhancement of photodegradation efficiency using Pt–TiO2 catalyst

2002

Chemosphere

553

331

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This study investigates the mechanism of photosensitization and the recombination of excited electron-hole pairs affected by depositing platinum (Pt) on the surface of titanium dioxide (TiO 2 ). A new catalyst of Pt-TiO 2 was prepared by a photoreduction process. Being model reactions, the photocatalytic oxidation of methylene blue and methyl orange in aqueous solutions using the Pt-TiO 2 catalyst was carried out under either UV or visible light irradiation. The experimental results indicate that an optimal content of 0.75% Pt-TiO 2 achieves the best photocatalytic performance of methylene blue and methyl orange degradation and that the PtTiO 2 catalyst can be sensitized by visible light. The interaction of Pt and TiO 2 was investigated by means of UV-visible absorption spectra, photoluminescence emission spectra, and X-ray photoelectron emission spectroscopy. The Pt 0 , Pt 2+ and Pt 4+ species existing on the surface of PtTiO 2 , and the Ti 3+ species existing in its lattice may form a defect energy level. The Pt impurities, * Author whom all correspondence should be addressed to This is the Pre-Published Version.2 including Pt, Pt(OH) 2 , and PtO 2, and the defect energy level absorb visible light more efficiently in comparison with the pure TiO 2 and hinder the recombination rate of excited electron/hole pairs.

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“…XRD measurements were performed in grazing incidence, on TiO 2 films loaded with AIP-derived silver particles, using a PANalytical X'Pert Pro MPD diffractometer with a 0. 29 incidence angle. Both apparatus used a Cu-Ka X-ray source ( ¼ 0.1541 nm).…”

Section: Characterisation Methodsmentioning

confidence: 99%

“…While noble metal nanoparticles, e.g. platinum nanoparticles, distributed at the surface of TiO 2 photocatalysts can enhance the photocatalytic activity [15,[22][23][24][25][26][27][28][29], organic residues can alter or cancel this activity [2,30]. While metal platinum nanoparticles are the objects of tremendous interest for electrode applications in proton exchange membrane fuel cells (PEMFC) [2,[31][32][33][34][35], the oxidation of organic residues present at the surface of these nanoparticles, yielding the formation of adsorbed carbon monoxide, can dramatically reduce the efficiency of such electrodes [2,30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

Riassetto¹,

Roussel²,

Rapenne³

et al. 2010

Journal of Experimental Nanoscience

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The photochemical reduction of metal precursors under UV light has been studied to produce noble metal nanoparticles. Depending on the metal (Pt, Au or Ag) and precursor (chlorinated or nitrate) natures, different 1-step or 2-step photolytic or photocatalytic reduction mechanisms have been investigated. These mechanisms yield simple all-inorganic methods to generate metal nanoparticles in liquid medium and disperse these particles at the surface of various kinds of supports. Depending on the metal particle and support natures, different functionalities can arise from such easy and low-cost photometallisation methods.

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Influence of the form of photodeposited platinum on titania upon its photocatalytic activity in CO and acetone oxidation

Cited by 131 publications

References 30 publications

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

The enhancement of photodegradation efficiency using Pt–TiO2 catalyst

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

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