Self Assembly and Properties of C:WO3 Nano-Platelets and C:VO2/V2O5 Triangular Capsules Produced by Laser Solution Photolysis

Mwakikunga, Bonex W.; Forbes, Andrew; Sideras‐Haddad, E.; Scriba, Manfred; Manikandan, E.

doi:10.1007/s11671-009-9494-4

Cited by 50 publications

(27 citation statements)

References 40 publications

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“…The proposed reaction sequence for the production of C:TiO 2 NPs, similar to that proposed by Livage [10] in the production of vanadium ethoxide and Mwakikunga et al [11] in the production of tungsten ethoxide, is as follows: …”

Section: Experimental: Preparation and Characterization Of Carbon Modmentioning

confidence: 92%

Effect of Carbon Modification on the Electrical, Structural, and Optical Properties ofTiO2Electrodes and Their Performance in Labscale Dye-Sensitized Solar Cells

Taziwa

Meyer

Sideras‐Haddad

et al. 2012

International Journal of Photoenergy

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Carbon-modified titanium dioxide nanoparticles (C:TiO 2 NPs) have been synthesized by ultrasonic nebulizer spray pyrolysis (USP) and pneumatic spray pyrolysis (PSP) techniques. HRTEM on the NPs shows difference in lattice spacing in the NP structures prepared by the two methods-2.02Å for the USP NPs and an average of 3.74Å for the PSP NPs. The most probable particle sizes are 3.11 nm and 5.5 nm, respectively. Raman spectroscopy supported by FTIR confirms the TiO 2 polymorph to be anatase with the intense phonon frequency at 153 cm −1 blue-shifted from 141 cm −1 ascribed to both carbon doping and particle size. A modified phonon confinement model for nanoparticles has been used to extract phonon dispersion and other parameters for anatase for the first time. Electronic measurements show "negative conductance" at some critical bias voltage, which is characteristic of n-type conductivity in the carbon-doped TiO 2 NPs as confirmed by the calculated areas under the I-V curves, a property suited for solar cell applications. Practical solar cells built from carbon-doped TiO 2 electrodes show up to 1.5 times improvement in efficiency compared to pure TiO 2 electrodes of similar construction.

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Section: Experimental: Preparation and Characterization Of Carbon Modmentioning

confidence: 92%

Effect of Carbon Modification on the Electrical, Structural, and Optical Properties ofTiO2Electrodes and Their Performance in Labscale Dye-Sensitized Solar Cells

Taziwa

Meyer

Sideras‐Haddad

et al. 2012

International Journal of Photoenergy

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“…The possible reaction path for the dissolution of WCl 6 in ethanol is described elsewhere. [13] For the preparation of the WO 3 film, the WO 3 solution was spin-coated on FTO-coated glass at 600 rpm for 30 s. After coating, the glass was heated on a hot plate at 100 8C for 1 min. This process was repeated several times to make WO 3 films with various thicknesses, and then the samples were heated in an oven at 500 8C for 2 h. To modify the WO 3 /FTO interfaces, C 70 (12 mg) was dissolved in 1,2-diclorobenzene (1 mL).…”

Section: Methodsmentioning

confidence: 99%

Selective Modulation of Charge‐Carrier Transport of a Photoanode in a Photoelectrochemical Cell by a Graphitized Fullerene Interfacial Layer

et al. 2014

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We show that a graphitic carbon interfacial layer, derived from C70 by annealing at 500 °C, results in a significant increase in the attainable photocurrent of a photoelectrochemical cell that contains a WO3 -functionalized fluorine-doped tin oxide (FTO) photoanode. Time-resolved photoluminescence spectroscopy, photoconductive atomic force microscopy, Hall measurements, and electrochemical impedance spectroscopy show that the increase in photocurrent is the result of fast and selective electron transport from optically excited WO3 through the graphitic carbon interfacial layer to the FTO-coated glass electrode. Thus the energy efficiency of perspective solar-to-fuel devices can be improved by modification of the interface of semiconductors and conducting substrate electrodes by using graphitized fullerene derivatives.

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“…The enhancement of the electrocatalytic activity of the WO 3 catalysts by adding carbon black to increase the electrical conductivity has been reported [16]. It has been also found that high ethanol sensitivity can be achieved by doping WO 3 with carbon [48]. Figure 5a gives the CV curves of the WO 3 /C samples with different WO 3 :C mass ratio.…”

Section: Resultsmentioning

confidence: 84%

High electrochemical activity from hybrid materials of electrospun tungsten oxide nanofibers and carbon black

Zhou

Qiu

et al. 2012

J Mater Sci

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Tungsten oxide (WO 3 ) nanofibers were prepared by oxidizing the electrospun ammonium metatungstate (AMT) and polyvinyl pyrrolidone (PVP) composite fibers. The WO 3 nanofibers with controllable diameters ranging from 80 to 130 nm were obtained by electrospinning different AMT/PVP mixture solutions. Electrochemical activity of the WO 3 nanofibers was measured in 0.5 M sulfuric acid solution. Cyclic voltammetry tests show that the WO 3 nanofibers have electrochemical activity which is closely related to hydrogen oxidation in fuel cells and the electrochemical activity could be greatly enhanced by the addition of carbon black. The hybrid materials of the WO 3 nanofibers and carbon black with the WO 3 :C mass ratio of 10:1 possess high electrochemical activity with an anodic peak current density of 11.2 mA/cm 2 , even higher than the commercial 20 wt% Pt/C catalyst. The electrospun WO 3 nanofibers may be promising electrocatalysts or catalyst supports for hydrogen oxidation in fuel cells due to the simplicity in production and high electrochemical activity.

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Self Assembly and Properties of C:WO3 Nano-Platelets and C:VO2/V2O5 Triangular Capsules Produced by Laser Solution Photolysis

Cited by 50 publications

References 40 publications

Effect of Carbon Modification on the Electrical, Structural, and Optical Properties ofTiO2Electrodes and Their Performance in Labscale Dye-Sensitized Solar Cells

Effect of Carbon Modification on the Electrical, Structural, and Optical Properties ofTiO2Electrodes and Their Performance in Labscale Dye-Sensitized Solar Cells

Selective Modulation of Charge‐Carrier Transport of a Photoanode in a Photoelectrochemical Cell by a Graphitized Fullerene Interfacial Layer

High electrochemical activity from hybrid materials of electrospun tungsten oxide nanofibers and carbon black

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