Behavior of surface peroxo species in the photoreactions at titanium dioxide

Ulmann, M.; Tacconi, Norma R. de; Augustyński, Jan

doi:10.1021/j100282a022

Cited by 82 publications

(58 citation statements)

References 8 publications

(9 reference statements)

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“…Similar results are observed for particulate thin-film electrodes of TiO 2 , N-and C-doped TiO 2 [3,30] and TaON [9]. These results can be explained as follows [31,32]. In the absence of a reductant, the photocurrent is solely attributed to the oxidation of water by photogenerated holes in the valence band, while in the presence of a reductant, the photocurrent is attributed not only to the oxidation of water but also to the oxidation of the reductant.…”

Section: Original Papersupporting

confidence: 78%

Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination

Liu

Imanishi

Nakamura

et al. 2008

Physica Status Solidi (b)

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A coupled TiO2‐BiVO4 system, Bix Tiy Vx O4x +2y (x ≈ y), with modified TiO2 and BiVO4 crystals through their interaction, was prepared in the form of powder by solid‐state reaction under the concept of combining properties of active photocatalysts. Experiments of photocatalytic oxygen evolution from an aqueous powder suspension under visible‐light irradiation (λ ≥ 420 nm) have shown that Bix Tiy Vx O4x +2y (x ≈ y) exhibits activity much higher than that of BiVO4, which is known as one of the most active visible‐light‐responsive photocatalysts, indicating the effectiveness of the interaction and the modification of TiO2 and BiVO4. XRD experiments showed that Bix Tiy Vx O4x +2y (x ≈ y) was composed of BiVO4 and TiO2 crystals slightly modified probably by partial exchange of V5+ and Ti4+ ions. Photocurrent vs. wavelength for a particulate Bix Tiy Vx O4x +2y (x ≈ y) film electrode demonstrated several components, in agreement with the conclusion that Bix Tiy Vx O4x +2y (x ≈ y) consisted of modified BiVO4 and TiO2 crystals. A possible band model was tentatively proposed to explain observed characteristics such as photocurrent density (j) vs. potential (U), j vs. illumination wavelength (λ), the U dependence of j vs. λ, and the effect of the addition of a reductant such as I−, MeOH, SCN− and Br– on j vs. U and j vs. λ. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Original Papersupporting

confidence: 78%

Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination

Liu

Imanishi

Nakamura

et al. 2008

Physica Status Solidi (b)

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“…Irradiated I-doped TiO 2 both in the visible and in the whole range of the spectra exhibits under both cathodic and anodic conditions an enhanced response of the electrode. With current growth, the amount of oxidized species increased, causing an observed shift of the cathodic peak as was expected [34]. The threshold potential of water molecule oxidation was significantly shifted towards negative potentials, under irradiation in the sequence: E th(Dark) > E th(Vis) > E th(UV-vis) .…”

Section: Light-cyclic Voltammetrysupporting

confidence: 62%

Preparation and characterisation of visible light responsive iodine doped TiO2 electrodes

Lisowska-Oleksiak

Szybowska

Jasulaitienė³

2010

Electrochimica Acta

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“…The method is based on the surface reaction of the Ti(IV)/Ti(III) transformation that is known to occur at potentials negative to the flat band potential of TiO 2 and just prior to hydrogen evolution [24][25][26][27]. Figure 2(a) presents characteristic cyclic voltammograms in 1 M Na 2 SO 4 solutions for the T-TiO 2 (500°C) and T-TiO 2 (700°C) electrodes and Figure 2(b) the corresponding curves for the particulate electrodes.…”

Section: Electrochemical Characterisation Of Tio 2 Coatings In the Darkmentioning

confidence: 99%

“…At the same time, continuous TiO 2 film electrodes produced by simple thermal annealing have also not often been used in photooxidation applications [4,7,23]. Finally, despite many studies of TiO 2 electrochemistry in the dark [24][25][26][27], the Ti(III)/Ti(IV) surface electrochemistry at potentials positive to hydrogen evolution has not been correlated to its performance under UV illumination.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical characterisation of thermal and particulate titanium dioxide electrodes

et al. 2005

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The photoelectrocatalytic performance of thermal and particulate TiO 2 films on Ti electrode substrates has been studied by photovoltammetry and bulk photoelectrolysis. The thermal TiO 2 film electrodes were prepared by Ti annealing in air at 700°C and 500°C while the particulate electrodes were prepared from dispersions of Degussa P-25 TiO 2 deposited onto Ti substrates and subsequently sintered at 700°C and 500°C. The photocurrent in the absence and presence of the model organic species of oxalate as well as its photooxidation rate depends on coating surface area, type (thermal or particulate) and crystallographic form (anatase or rutile). A method is proposed to account for surface area variations by normalising the data with respect to the electroactive surface area of the TiO 2 electrodes, as estimated by their surface electrochemistry in the dark. The thermal electrodes show high photocurrents both in the absence and the presence of oxalate whereas the performance of particulate electrodes is significantly improved upon oxalate addition. Nevertheless, the efficiency of thermal 700°C TiO 2 for oxalate photooxidation during bulk photoelectrolysis is comparable to that of Degussa P-25 TiO 2 -coated electrodes.

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Behavior of surface peroxo species in the photoreactions at titanium dioxide

Cited by 82 publications

References 8 publications

Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination

Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination

Preparation and characterisation of visible light responsive iodine doped TiO2 electrodes

Photoelectrochemical characterisation of thermal and particulate titanium dioxide electrodes

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Behavior of surface peroxo species in the photoreactions at titanium dioxide

Cited by 82 publications

References 8 publications

Highly active photocatalyst Bix Tiy Vx O4x +2y (x ≈ y) for oxygen evolution under visible‐light illumination

Highly active photocatalyst Bix Tiy Vx O4x +2y (x ≈ y) for oxygen evolution under visible‐light illumination

Preparation and characterisation of visible light responsive iodine doped TiO2 electrodes

Photoelectrochemical characterisation of thermal and particulate titanium dioxide electrodes

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Product

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Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination

Highly active photocatalyst Bi_x Ti_y V_x O_{4x +2y} (x ≈ y) for oxygen evolution under visible‐light illumination