Nanotubular Transition Metal Oxide for Hydrogen Production

Srimala Sreekantan; E Pei San; Chin Wei Lai; Warapong Kregvirat

doi:10.4028/www.scientific.net/AMR.364.494

Paper Titles

Effect of Calcination and Reduction Process on MWCNT Growth during Synthesizing MWCNT-Alumina Hybrid as Composite Reinforcement
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A Study of the Nanostructure of the Cellulose of Acacia mangium Wood by X-Ray Diffraction and Small-Angle X-Ray Scattering
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Synthesis of Monodisperse CdSe QDs Using Controlled Growth Temperatures
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Benzoyl Peroxide Initiated Grafting of 3-Aminopropyltriethoxysilane to Multiwalled Carbon Nanotubes
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Nanotubular Transition Metal Oxide for Hydrogen Production
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Preparation Ag₂S Nanorods and Nanoparticles via a Simple Chemical Method
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Study on Controlled Size, Shape and Dispersity of Gold Nanoparticles (AuNPs) Synthesized via Seeded-Growth Technique for Immunoassay Labeling
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Influence of Calcinations Temperatures on Structural and Photoluminescence Properties of ZnO Nanoparticles via Precipitation Method
p.510

Effect of Sonochemical Duration on the Synthesis of Vanadium Oxide Nanowires
p.515

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 364Nanotubular Transition Metal Oxide for Hydrogen...

Nanotubular Transition Metal Oxide for Hydrogen Production

Abstract:

TiO_2, transition metal oxide nanotubes were successfully grown by anodizing of titanium foil (Ti) in ethylene glycol electrolyte containing 5wt % hydrogen peroxide and 5wt % ammonium fluoride for 60 minutes at 60V. It was found such electrochemical condition resulted in the formation of nanotube with average diameter of 90nm and length of 6.6 µm. These samples were used to study the effect of W loading by RF sputtering on TiO₂ nanotubes. Amorphous TiO₂ nanotube substrate leads to enhance incorporation of W instead of anatase. Therefore for the entire study, W was sputtered on amorphous TiO₂ nanotube substrate. TiO₂ nanotube sputtered below 1 minute resulted in the formation of W-O-Ti while beyond this point; it accumulates to form a self-independent structure of WO₃ on the surface of the nanotubes. TiO₂ nanotube sputtered for 1minute at 100W and annealed at 450°C exhibited best photocurrent density (1.4 mA/cm²) with photoconversion efficiency of 2.5%. The reason for such behavior is attributed to W⁶⁺ ions allows for electron traps that suppress electron-hole recombination and exploit the lower band gap of material to produce a water splitting process by increasing the charge separation and extending the energy range of photoexcitation for the system.