Abstract
We report on non-particulate titania photoelectrodes with a unique highly-ordered nanotube-array architecture prepared by an anodization process that enables precise control over array dimensions. Under 320–400 nm illumination titania nanotube-array photoanodes, pore size 110 nm, wall thickness 20 nm, and 6 μm length, generate hydrogen by water photoelectrolysis at a normalized rate of 80 mL/W·hr, to date the most efficient titania-based photoelectrochemical device, with a conversion efficiency of 12.25%. The highly-ordered nanotubular architecture allows for superior charge separation and charge transport, with a calculated quantum efficiency of nearly 100% for incident photons with energies larger than the titania bandgap.
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Paulose, M., Varghese, O.K., Shankar, K. et al. Photoelectrochemical Properties of Highly-ordered Titania Nanotube-arrays. MRS Online Proceedings Library 837, 39–44 (2004). https://doi.org/10.1557/PROC-837-N3.13
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DOI: https://doi.org/10.1557/PROC-837-N3.13