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1 results

  • Photoelectrochemical Properties of Highly-ordered Titania Nanotube-arrays

  • Maggie Paulose, Oomman K. Varghese, Karthik Shankar, Gopal K. Mor, Craig A. Grimes
  • Journal:
    MRS Online Proceedings Library Archive / Volume 837 / 2004
    Published online by Cambridge University Press:
    01 February 2011, N3.13
    Print publication:
    2004

  • 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.