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Photoelectrochemical Properties of Highly-ordered Titania Nanotube-arrays

Published online by Cambridge University Press:  01 February 2011

Maggie Paulose ,
Oomman K. Varghese ,
Karthik Shankar ,
Gopal K. Mor  and
Craig A. Grimes
Maggie Paulose
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, and The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
Oomman K. Varghese
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, and The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
Karthik Shankar
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, and The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
Gopal K. Mor
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, and The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
Craig A. Grimes
Affiliation:
Department of Electrical Engineering, Department of Materials Science and Engineering, and The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
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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.

Keywords

Photolysistitaniananotubewater splittinghydrogen.
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 837: Symposium N – Materials for Hydrogen Storage – 2004 , 2004 , N3.13
Copyright
Copyright © Materials Research Society 2005

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References

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