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Water-Photolysis Properties of Micron-Length Highly-Ordered Titania Nanotube-Arrays

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Abstract:

We report the water photoelectrolysis and photoelectrochemical properties of the titania nanotube arrays as a function of nanotube crystallinity, length (up to 6.4 m), and pore size. Most noteworthy of our results, under 320–400 nm illumination (98 mW/cm2) the titania nanotube-array photoanodes (area 1 cm2), pore size 110nm, wall thickness 20nm, and 6 m length, generate hydrogen by water photoelectrolysis at a rate of 7.6 mL/hr, with a photoconversion efficiency of 12.25%. The energy-time normalized hydrogen evolution rate is 80mL/hrW, the largest reported hydrogen photoelectrolysis generation rate for any material system by a factor of four. The highly-ordered nanotubular architecture appears to allow for superior charge separation and charge transport, with a calculated quantum efficiency of over 80% for incident photons with energies larger than the titania bandgap.

Keywords: HYDROGEN; PHOTOCON-VERSION EFFICIENCY; PHOTOELECTROCHEMISTRY; PHOTOLYSIS; TITANIA NANOTUBE ARRAYS; WATER-PHOTOELECTROLYSIS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2005.195

Publication date: July 1, 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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