Effects of Single Metal-Ion Doping on the Visible-Light Photoreactivity of TiO<sub>2</sub>

Choi, Jina; Park, Hyunwoong; Hoffmann, Michael R.

doi:10.1021/jp908088x

Cited by 722 publications

(470 citation statements)

References 70 publications

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“…The high weight % of titanium and oxygen shows that they are the main components. The weight % loading of the dopant in Ag-TiO 2 at 0.3 wt.% was much higher compared to that of Ag-TiO 2 at 0.5 wt.% and this can be suggested to be due to silver dopant attaching onto the surface of titania and not incorporated into the crystal lattice in which case it would be shadowed from detection, this result is in agreement with the previous work [26,27,28] . This can be seen when increasing the doping ratio leads to increased (FWHM) of anatase peaks.…”

Section: Ijsrnetsupporting

confidence: 91%

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

2016

IJSR

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Titania nanotubes thin films have been prepared by electrochemical anodization of Ti foil at room temperature (~25ºC), in ethylene glycol base electrolyte with 0.5wt. % NH 4 F and 4wt% deionized water at 30V at time 3hr and then AgNPs-doped TiO 2 nanotube arrays at different deposition ratios (0.3, 0.5, 0.7, 0.9 wt%) were carried out by electroless deposition. These tubes are well aligned and organized into high-density uniform arrays. The average tube diameter, ranging in size from 61 to 74 nm, the length of the tube 2.13 µ, and ranging in size of wall thickness from 21 to 29 nm. A possible growth mechanism is presented. The TiO 2 nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscope (FESEM) and energy dispersive X-ray spectroscopy (EDX(. Gas sensors based on AgNPs/TiO 2 nanotube arrays thin films were fabricated, and their sensing properties were investigated. The AgNPs/TiO 2 nanotube sensor demonstrated a good sensitivity at different concentration hydrogen atmospheres ranging from (15, 30, 45, 60, 75ppm) H 2 . A temperature-dependent sensing from 25°C to 300°C was also found with an applied voltage was constant at 6V.

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Section: Ijsrnetsupporting

confidence: 91%

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

2016

IJSR

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“…To reduce the intrinsic band gap of TiO 2 , several strategies have been tested including the incorporation of either metallic (e.g., Fe and Ni) or non-metallic (e.g., C, F, N, S, P, and B) atoms into the lattice of TiO 2 host materials [9,15,[25][26][27]. Metal doping has shown controversial photocatalytic activity results at both UV and visible wavelengths [28][29][30][31]. In addition, metal doping in titania can be complicated by thermal instability, an increase of carrier-recombination centers, dopant insolubility, the formation of secondary phases or surface aggregation rather than substitution, phase transformation among the titania polymorphs, the alteration of charge carrier diffusion length, narrow band bending, etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

et al. 2017

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Mesoporous titania (mp-TiO 2 ) has drawn tremendous attention for a diverse set of applications due to its high surface area, interfacial structure, and tunable combination of pore size, pore orientation, wall thickness, and pore connectivity. Its pore structure facilitates rapid diffusion of reactants and charge carriers to the photocatalytically active interface of TiO 2 . However, because the large band gap of TiO 2 limits its ability to utilize visible light, non-metal doping has been extensively studied to tune the energy levels of TiO 2 . While first-principles calculations support the efficacy of this approach, it is challenging to efficiently introduce active non-metal dopants into the lattice of TiO 2 . This review surveys recent advances in the preparation of mp-TiO 2 and their doping with non-metal atoms. Different doping strategies and dopant sources are discussed. Further, co-doping with combinations of non-metal dopants are discussed as strategies to reduce the band gap, improve photogenerated charge separation, and enhance visible light absorption. The improvements resulting from each doping strategy are discussed in light of potential changes in mesoporous architecture, dopant composition and chemical state, extent of band gap reduction, and improvement in photocatalytic activities. Finally, potential applications of non-metal-doped mp-TiO 2 are explored in water splitting, CO 2 reduction, and environmental remediation with visible light.

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“…and/or non-metallic (C, N, P, F, etc.) heteroatoms has been proven to be one effective route and is thus widely used in practice [9][10][11][12]. Recently, hydrogenation, i.e., reduction in hydrogen, was found to be another efficient route to create defects and to obtain oxygen-deficient TiO2 (TiO2−δ) [6,13].…”

Section: Introductionmentioning

confidence: 99%

CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production

Chen

Wang

et al. 2015

Catalysts

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Composites consisting of carbon nanotubes (CNTs) grown directly on oxygen-deficient anatase TiO2 (TiO2−δ) were synthesized by a two-step chemical vapor deposition (CVD) method and applied in photocatalytic hydrogen production from aqueous methanol solutions using photodeposited Pt as the co-catalyst. Thermogravimetry coupled with mass spectroscopy, X-ray diffraction, scanning electron microscopy, photocurrent analysis, X-ray photoelectron spectroscopy, and (scanning) transmission electron microscopy were performed to investigate the physical and (photo)chemical properties of the synthesized CNT-TiO2−δ composites before and after photocatalytic methanol reforming. The initial photocatalytic activity of TiO2 was found to be significantly improved in the presence of oxygen vacancies. An optimized amount (~7.2 wt%) of CNTs OPEN ACCESSCatalysts 2015, 5 271 grown on the TiO2−δ surface led to a highly effective stabilization of the photocatalytic performance of TiO2−δ, which is attributed to the improved dispersion and stability of the photodeposited Pt co-catalyst nanoparticles and enhanced separation efficiency of photogenerated electron-hole pairs, rendering the photocatalysts less prone to deactivation.

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Effects of Single Metal-Ion Doping on the Visible-Light Photoreactivity of TiO₂

Cited by 722 publications

References 70 publications

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production

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Effects of Single Metal-Ion Doping on the Visible-Light Photoreactivity of TiO2

Cited by 722 publications

References 70 publications

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

Hydrogen Gas Sensing Properties of AgNPs-Doped Titania Nanotubes by Electroless Deposition

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production

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Effects of Single Metal-Ion Doping on the Visible-Light Photoreactivity of TiO₂