TiO2–graphene nanocomposites for photocatalytic hydrogen production from splitting water

Cheng, Ping; Liu, Yang; Hong, Wang; Cheng, Wei; Chen, Mingxia; Shangguan, Wenfeng; Ding, Guifu

doi:10.1016/j.ijhydene.2011.11.004

Cited by 222 publications

(82 citation statements)

References 35 publications

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“…In addition, graphene-TiO 2 hybrid compound, in the form of powders or thin films, enables an extended light harvesting capability, owing to Ti-O-C bonding. Also, graphene-TiO 2 interfaces provide effective charge transfer junctions, which help the injection of electrons from TiO 2 to graphene sheets leading to prolonged recombination [7,[13][14][15][16]. Beside coordination with inorganic materials, graphene provides a strong chemical affinity with organic materials, in particular with the organic dyes [17].…”

Section: Introductionmentioning

confidence: 99%

“…To alleviate this complication, several strategies have been suggested, such as using TiO 2 nanowires instead of nanoparticles [7], and using layer-by-layer assembly of TiO 2 and graphene nanosheets [13]. In a study conducted by Cheng et al [14], graphene-TiO 2 composite was synthesized by solvothermal reaction, using various graphene to TiO 2 ratios. Rahimi et al [15] studied the role of graphene content on light absorption and photoactivity of graphene-TiO 2 blend made by solvothermal method.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

2017

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Abstract:In this work, we communicate a facile and low temperature synthesis process for the fabrication of graphene-TiO 2 photocatalytic composite thin films. A sol-gel chemical route is used to synthesize TiO 2 from the precursor solutions and spin and spray coating are used to deposit the films. Excitation of the wet films during the casting process by ultrasonic vibration favorably influences both the sol-gel route and the deposition process, through the following mechanisms. The ultrasound energy imparted to the wet film breaks down the physical bonds of the gel phase. As a result, only a low-temperature post annealing process is required to eliminate the residues to complete the conversion of precursors to TiO 2 . In addition, ultrasonic vibration creates a nanoscale agitating motion or microstreaming in the liquid film that facilitates mixing of TiO 2 and graphene nanosheets. The films made based on the above-mentioned ultrasonic vibration-assisted method and annealed at 150 • C contain both rutile and anatase phases of TiO 2 , which is the most favorable configuration for photocatalytic applications. The photoinduced and photocatalytic experiments demonstrate effective photocurrent generation and elimination of pollutants by graphene-TiO 2 composite thin films fabricated via scalable spray coating and mild temperature processing, the results of which are comparable with those made using lab-scale and energy-intensive processes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

2017

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“…Titanium-(IV) n-butoxide (TNB, C 16 Table 1). The resulting mixture was heated under reflux in air and stirred at 343 K for 6h using a magnetic stirrer in a vial.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, although the optical band gap is positioned at the near-infrared region, WO 3 -TiO 2 composite can be still excited by the visible-light whose energy is higher than that of the optical band gap. 16) Because of the synergistic reaction of WO 3 and TiO 2 , the adsorption effect of WO 3 -TiO 2 is good in both the ultraviolet and visible regions. In Fig.…”

Section: )mentioning

confidence: 99%

Sonocatalytic Degradation of Rhodamine B in the Presence of TiO₂Nanoparticles by Loading WO₃

Meng¹,

Sarkar²,

Zhu³

et al. 2014

Korean Journal of Materials Research

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In the present work, WO 3 and WO 3 -TiO 2 were prepared by the chemical deposition method. Structural variations, surface state and elemental compositions were investigated for preparation of WO 3 -TiO 2 sonocatalyst. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and transmission electron microscopy (TEM) were employed for characterization of these new photocatalysts. A rhodamine B (Rh.B) solution under ultrasonic irradiation was used to determine the catalytic activity. Excellent catalytic degradation of an Rh.B solution was observed using the WO 3 -TiO 2 composites under ultrasonic irradiation. Sonocatalytic degradation is a novel technology of treating wastewater. During the ultrasonic treatment of aqueous solutions sonoluminescence, cavitaties and "hot spot" occurred, leading to the dissociation of water molecules. In case of a WO 3 coupled system, a semiconductor coupled with two components has a beneficial role in improving charge separation and enhancing TiO 2 response to ultrasonic radiations. In case of the addition of WO 3 as new matter, the excited electrons from the WO 3 particles are quickly transferred to TiO 2 particle, as the conduction band of WO 3 is 0.74 eV which is −0.5 eV more than that of TiO 2 . This transfer of charge should enhance the oxidation of the adsorbed organic substrate. The result shows that the photocatalytic performance of TiO 2 nanoparticles was improved by loading WO 3.

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“…Graphene is a two-dimensional sp 2 -hybridized carbon nanosheet, which possesses a large specific surface area, high mobility of charge carriers, and good mechanical strength, thus is used frequently to prepare functional nanomaterials. Cheng et al 9 prepared TiO 2 -graphene nanocomposites for photocatalytic hydrogen production from splitting water. Due to its twodimensional p-conjugation structure, graphene served as an acceptor of the photogenerated electrons of TiO 2 to separate the photogenerated electron/hole pairs effectively, thus improved the hydrogen production ability.…”

Section: -16mentioning

confidence: 99%

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light

Hu¹,

Li²,

Fan³

2013

Bulletin of the Korean Chemical Society

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The dihydroxy naphthalene/TiO 2 complexes with different substitution patterns were prepared by surface modification. X-ray diffraction, UV-Vis spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy were used to characterize the prepared composite materials. The results indicated that the surface modification did not influence the crystallization of TiO 2 . The visible-light absorbances of prepared dihydroxy naphthalene/TiO 2 complexes could be assigned to the ligand-to-metal charge transfer. The obtained catalyst exhibited outstanding photocatalytic activity and stability under visible light. A linear relationship existed between the percentages of hydroxynaphthalenes coordinated on TiO 2 surface and H 2 production ability. The substitution pattern of dihydroxy naphthalene and CH 3 OH content could also influence the photocatalytic performance remarkably. The photocatalytic H 2 production ability was further improved after loading with ultra low concentration of Pt, 0.02 wt %. The possible mechanism was proposed.

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TiO2–graphene nanocomposites for photocatalytic hydrogen production from splitting water

Cited by 222 publications

References 35 publications

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Sonocatalytic Degradation of Rhodamine B in the Presence of TiO₂Nanoparticles by Loading WO₃

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light

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TiO2–graphene nanocomposites for photocatalytic hydrogen production from splitting water

Cited by 222 publications

References 35 publications

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Sonocatalytic Degradation of Rhodamine B in the Presence of TiO2Nanoparticles by Loading WO3

Preparation of Dihydroxy Naphthalene/TiO2Complex via Surface Modification and Their Photocatalytic H2Production Performances Under Visible Light

Contact Info

Product

Resources

About

Sonocatalytic Degradation of Rhodamine B in the Presence of TiO₂Nanoparticles by Loading WO₃

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light