Water-Photolysis Properties of Micron-Length Highly-Ordered Titania Nanotube-Arrays
Authors: Varghese, Oomman K.; Paulose, Maggie; Shankar, Karthik; Mor, Gopal K.; Grimes, Craig A.
Source: Journal of Nanoscience and Nanotechnology, Volume 5, Number 7, July 2005 , pp. 1158-1165(8)
Publisher: American Scientific Publishers
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.
Document Type: Research Article
Publication date: July 1, 2005
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