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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 925Development of Hybrid WO3-TiO2 Nanotubes for Solar...

Development of Hybrid WO₃-TiO₂ Nanotubes for Solar Hydrogen Generation via Water Electrolysis

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Abstract:

Solar hydrogen (H₂) generation from water electrolysis is a key target for the development of sustainable hydrogen economy for future energy system. The formation of self-organized and highly ordered titania (TiO₂) nanotubes is essential for high efficiency in photoelectrochemical (PEC) water electrolysis application. Based on our preliminary studies, highly ordered TiO₂ nanotubes were successfully synthesized through anodization of titanium (Ti) foil in ethylene glycol (EG) containing 5 wt% of ammonium fluoride (NH₄F) and 5 wt% of hydrogen peroxide (H₂O₂) at 60 V for 1 h. However, an obvious hindrance to the widespread use of TiO₂ nanotubes as a photoelectrode in PEC water electrolysis system is its poor visible light response and rapid recombination of photo-induced electron/hole pairs. Thus, continuous efforts have been exerted to improve the efficiency of PEC water electrolysis by incorporating an optimum content of W⁶⁺ species into TiO₂ nanotubes. In the present study, a practical technique of radio frequency (RF) sputtering was selected to incorporate W⁶⁺ species into TiO₂ lattice. It was found that TiO₂ nanotubes sputtered at high energy of 50 W for 30 sec demonstrated a maximum photocurrent density of ~ 2.4 mA/cm² with photoconversion efficiency ~ 6 %.

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Periodical:

Advanced Materials Research (Volume 925)

Pages:

474-478

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.925.474

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Online since:

April 2014

Authors:

Chin Wei Lai*, Kung Shiuh Lau

Keywords:

H₂ Production, Photocatalyst, RF Sputtering, Water Electrolysis, WO₃-TiO₂ Nanotubes

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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