Charge–discharge behavior of TiO2–WO3photocatalysis systems with energy storage ability

Ngaotrakanwiwat, Pailin; Tatsuma, Tetsu; Saitoh, Shu‐ichi; Ohko, Yoshihisa; Fujishima, Akira

doi:10.1039/b304181f

Cited by 102 publications

(73 citation statements)

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“…On the other hand, the bicomponent WO 3 /TiO 2 has been found to exhibit higher photocatalytic reactivity for the decomposition of organic compounds than either TiO 2 or WO 3 itself [7]. Moreover, the WO 3 /TiO 2 system, with its energy storage ability, could also be applied for anticorrosion or bactericidal effects [8][9][10]. The photoinduced charge separation on WO 3 /TiO 2 to produce a hole and an electron initiates the oxidation and slow reduction of the substrates even under dark conditions, respectively.…”

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Photo-electrochemical properties of amorphous WO3 supported on TiO2 hybrid catalysts

et al. 2005

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In this work, we have carried out ivestigations on photo-electrochemical energy conversion and storage on WO 3 /TiO 2 hybrid materials. The band gap excitation of the hybrid WO 3 /TiO 2 having an amorphous WO 3 phase led to an effective photo-charging to form a tungsten bronze structure by the intercalation of protons while a reversible discharging through de-intercalation could also be observed.The photo-electrochemical conversion and storage of solar (photo) energy using semiconductors have attracted considerable interest over the last decades. Tungsten trioxide (WO 3 ) is especially interesting as a photo-anode and electro-or photo-chromic material [1][2][3][4][5][6]. On the other hand, the bicomponent WO 3 /TiO 2 has been found to exhibit higher photocatalytic reactivity for the decomposition of organic compounds than either TiO 2 or WO 3 itself [7]. Moreover, the WO 3 /TiO 2 system, with its energy storage ability, could also be applied for anticorrosion or bactericidal effects [8][9][10]. The photoinduced charge separation on WO 3 /TiO 2 to produce a hole and an electron initiates the oxidation and slow reduction of the substrates even under dark conditions, respectively. Our aim is to design such photo-functional devices as photo-chargeable batteries using a hybrid WO 3 /TiO 2 that can operate as an effective UV-light driven photo-anode for charge separation as well as charge accumulation. Here, we report on the effects of the crystallinity of WO 3 , i.e., polycrystalline or amorphous, on its photo-charging and discharging abilities using hybrid WO 3 /TiO 2 materials. ExperimentalA polycrystalline WO 3 (referred to as c-WO 3 ) and an amorphous WO 3 (a-WO 3 ) were prepared by the thermal decomposition of ammonium tungstate at 873 K for 6 h and tungstic acid (H 2 WO 4 ) at 573 K for 1 h, respectively. An a-WO 3 /TiO 2 and c-WO 3 /TiO 2 with 20 wt% WO 3 were prepared by the impregnation of ammonium tungstate into TiO 2 (anatase structure, Kanto Chemicals), and by a physical mixing of c-WO 3 with TiO 2 , respectively. Each sample was spread over a conductive indium tin oxide glass (ITO, 10 W) with triethyleneglycol as the binder, and was then calcinated in air at 773 K for 15 min. The powder X-ray diffraction (XRD) patterns of all the samples were obtained with a RIGAKU RINT2000 using Cu K a radiation (k=1.5417 Å ).The charge-discharge characteristics of these materials were measured by a potentiostat (HA-501, HOKUTO DENKO) used as a potentiometer. A black light (UV-light: 365 nm, 0.50 mW/cm 2 ) was used as the light source for the photo-charging. In the charge-discharge cycle tests, all of the electrodes were discharged at a constant current density of 10 lA/cm 2 between the photo-electrode (working electrode) and Pt wire (counter electrode). The electrolyte was adjusted to 0.5 M (COOH) 2 and 0.1 M LiClO 4 in CH 3 OH solution. The electrolyte was bubbled with N 2 gas for 30 min under vigorous stirring. Results and discussionThe characteristics of the charge-discharge properties for the photo-electrodes of TiO...

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Photo-electrochemical properties of amorphous WO3 supported on TiO2 hybrid catalysts

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“…So as to retain some photocatalytic effects even after dark, Tatsuma et al developed photocatalysts with energy storage abilities. [24][25][26][27][28][29] Surplus energy from a photocatalyst is stored during the daytime, and it allows continuing some photocatalytic reactions during the night. In the early stage of the development, a photocatalyst, TiO 2 7,24-28 28 The latter, a rechargeable material, is reduced by the photoexcited electrons from the photocatalyst under illumination, and the reduced material exhibits anti-bacterial 27 and anticorrosion 24 effects on the basis of reductive reactions after dark.…”

Section: Photocatalysts With Oxidative Energy Storage Abilitiesmentioning

confidence: 99%

Metal and Metal Oxide Nanoparticles for Photoelectrochemical Materials and Devices

2014

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We have developed three types of photoelectrochemical nanomaterials and devices based on metal and/or semiconducting metal oxide nanoparticles for effective use of light energy. Photocatalysts with oxidative energy storage abilities were developed by coupling a photocatalyst with a rechargeable metal oxide or metal hydroxide nanomaterial to address an issue that TiO 2 photocatalyst does not function after dark. Plasmonic metal nanoparticle ensembles were thermally and/or chemically stabilized by using a metal oxide nanomask or ultrathin metal oxide coating and applied to localized surface plasmon resonance sensors and photovoltaic cells based on the plasmoninduced charge separation. Organic and organic-inorganic hybrid photoelectrodes were also developed to give photocurrents enhanced by optimally arranged plasmonic metal nanoantennas.

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“…WO 3 nanoparticles are recognized as not only an important visible-light-responsive photocatalyst but also an excellent electron storage material. [24][25][26][27][28] …”

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confidence: 99%

Preparation of C60 Nanowhiskers/WO3 Nanocomposites and Photocatalytic Degradation of Organic Dyes

Kim¹,

Ko²,

Ko³

2015

Elastomers and Composites

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C 60 nanowhiskers were synthesized from C 60 by liquid-liquid interfacial precipitation (LLIP) using C 60 -saturated toluene and isopropyl alcohol. The WO 3 nanoparticles were synthesized by adding 3.8 × 10 −4 mole amount of ammonium metatungstate hydrate (H 26 N 6 O 40 W 12 ·H 2 O) to 500 ml of distilled water, and the resulting solution was heated on a hot plate for 4 h. The C 60 nanowhiskers/WO 3 nanocomposites were prepared with C 60 nanowhiskers and WO 3 nanoparticles in an electric furnace at 700°C in an argon gas atmosphere for 2 h. The C 60 nanowhiskers/WO 3 nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. UV-vis spectroscopy was used to evaluate the performance of the C 60 nanowhiskers/WO 3 nanocomposites as a photocatalyst in the degradation of organic dyes, such as methylene blue (MB) and brilliant green (BG) under ultraviolet light (254 nm).

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Charge–discharge behavior of TiO₂–WO₃photocatalysis systems with energy storage ability

Cited by 102 publications

References 13 publications

Photo-electrochemical properties of amorphous WO3 supported on TiO2 hybrid catalysts

Photo-electrochemical properties of amorphous WO3 supported on TiO2 hybrid catalysts

Metal and Metal Oxide Nanoparticles for Photoelectrochemical Materials and Devices

Preparation of C<sub>60</sub> Nanowhiskers/WO<sub>3</sub> Nanocomposites and Photocatalytic Degradation of Organic Dyes

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