Kinetics of the photocatalytic water-splitting reaction on TiO2 and Pt/TiO2 studied by time-resolved infrared absorption spectroscopy

Yamakata, Akira; Ishibashi, Teru; Ōnishi, Hiroshi

doi:10.1016/s1381-1169(03)00021-9

Cited by 133 publications

(128 citation statements)

References 24 publications

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“…Many studies have focused on the dependence of the obtained phase on preparation methods, deposition parameters, substrate type, doping of metallic and nonmetallic species 3,6 . Anatase TiO 2 is considered one of the best photocatalysts with high activity and non-toxic properties 5 , furthermore, it exhibits high chemical reactivity and stability under UV illumination 2 , which leads to greater possibilities for practical application as antibacterial agents [2][3][4][5] , self-cleaning surfaces 7 , organic photo degradation 8,6 , and hydrogen generation by the splitting of water, termed solar-hydrogen 6,9,10 . In addition, depending of phase and preparation conditions, anatase TiO 2 has high durability, high refractive index (n = 2.3), high resistivity and dielectric constant 11 k, with values from 30 to 100, so it is suitable for applications in optical wave-guides 12 , antireflection coatings 13 , photochemical solar cells 14,15 and gas sensors 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Deposition of TiO2 Film on Duplex Stainless Steel Substrate Using the Cathodic Cage Plasma Technique

et al. 2016

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This research used the "cathodic cage (CC)" technique for TiO 2 film deposition on duplex stainless steel substrate. This technique uses a multiple hollow cathode effect. Duplex stainless steel substrates were treated at temperatures of 300 o C, 350 o C and 400 o C, giving a temperature value ratio (T s /T m ) of 0.27 to 0.31 (Ts being the substrate temperature and Tm the melting temperature of the deposited material). Treatment times of 1, 2 and 4 hours were administered and polycrystalline TiO 2 films were obtained. The films were analyzed by optical microscopy (OM), X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). During analysis, the formation of uniform films and the possibility of controlling the TiO 2 phase were observed. It was also shown that with longer treatment times and higher temperatures the rutile phase predominates. For treatment times of 4 hours at all temperatures, the rutile structure was present. With treatment times of less than 4 hours, anatase was present. In addition, results showed that this simple, low cost technique can be an alternative method for depositions of TiO 2 films, with the advantage of high levels of control over porosity, thickness and phase composition (anatase and rutile).

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Section: Introductionmentioning

confidence: 99%

Deposition of TiO2 Film on Duplex Stainless Steel Substrate Using the Cathodic Cage Plasma Technique

et al. 2016

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“…Electron paramagnetic resonance (EPR) has also been used to measure such species [4][5][6][7][8], though active oxygen species liberated simultaneously may interfere. Spectroscopy is an alternative way for investigation on the dynamics of electrons and positive holes, and ultrafast spectroscopy under various conditions has been reported [9][10][11][12][13]. In those spectroscopic studies, diffuse reflectance (DR) spectroscopy has been frequently employed to estimate absorption of powder samples, but sometimes scattering and reflection cause difficulty in accurate measurement of photoabsorption [14].…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic spectroscopic analysis of photoinduced change in absorption of titanium(IV) oxide photocatalyst powders: A novel feasible technique for measurement of defect density

Murakami

Mahaney

Torimoto

et al. 2006

Chemical Physics Letters

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Photoabsorption properties of titanium(IV) oxide powders were investigated by photoacoustic (PA) spectroscopy. The photoacoustic spectra obtained under steady-state ultraviolet irradiation showed appearance and growth of two kinds of PA signal bands, which were attributable to trivalent titanium species (Ti 3+ ) and trapped holes or surface peroxide species. The saturation limit of the PA signal was estimated by analyzing the time course of Ti 3+ signals and compared to the density of Ti 3+ determined by a photochemical method. The results suggest that the photoacoustic spectroscopic technique is a feasible alternative method for estimation of Ti 3+ as an empirical measure of defect density. * Corresponding

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“…This excludes the possibility that the 3PP process involves a build up of carriers in the CB on the time scale between the laser excitation cycles or that the sample charging influences the spectra. Although under some circumstances the carrier lifetimes in TiO 2 can extend to the millisecond time scale, 70 the slow carrier recombination does not appear to affect the mPP signal from single crystal TiO 2 surface in vacuum at MHz repetition rates. It is possible that the carrier recombination in the absence of molecular electron or hole traps is sufficiently fast to remove CB carriers between each cycle of excitation, or that the upward band bending near the surface sweeps electrons into the bulk of the crystal where they are not detected.…”

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confidence: 99%

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

et al. 2015

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We investigate the spectroscopy and photoinduced electron dynamics within the conduction band of reduced rutile TiO 2 (110) surface by multiphoton photoemission (mPP) spectroscopy with wavelength tunable ultrafast (~20 fs) laser pulse excitation. Tuning the mPP photon excitation energy between 2.9 and 4.6 eV reveals a nearly degenerate pair of new unoccupied states located at 2.73±0.05 and 2.85±0.05 eV above the Fermi level, which can be analyzed through the polarization and sample azimuthal orientation dependence of the mPP spectra. Based on the calculated electronic structure and optical transition moments, as well as related spectroscopic evidence, we assign these resonances to transitions between Ti 3d-bands of nominally t 2g and e g symmetry, which are split by crystal-field. The initial states for the optical transition are the reduced Ti 3+ states of t 2g symmetry populated by formation oxygen vacancy defects, which exist within the band gap of TiO 2 . Furthermore, we studied the electron dynamics within the conduction band of TiO 2 by three-dimensional (3D) time-resolved pump-probe interferometric mPP measurements. The spectroscopic and time-resolved studies reveal competition between 2PP and 3PP processes where the t 2g -e g transitions in the 2PP process saturate, and are overtaken by the 3PP process initiated by the band gap excitation from the valence band of TiO 2 .

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Kinetics of the photocatalytic water-splitting reaction on TiO2 and Pt/TiO2 studied by time-resolved infrared absorption spectroscopy

Cited by 133 publications

References 24 publications

Deposition of TiO2 Film on Duplex Stainless Steel Substrate Using the Cathodic Cage Plasma Technique

Deposition of TiO2 Film on Duplex Stainless Steel Substrate Using the Cathodic Cage Plasma Technique

Photoacoustic spectroscopic analysis of photoinduced change in absorption of titanium(IV) oxide photocatalyst powders: A novel feasible technique for measurement of defect density

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

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