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Water-Photolysis Properties of Micron-Length Highly-Ordered Titania Nanotube-Arrays
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 microm), 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 110 nm, wall thickness 20 nm, and 6 microm 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 80 mL/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.
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Cited by
Semiconductor-based Photocatalytic Hydrogen Generation
Chen, X., Shen, S., Guo, L., & Mao, S. S. (2010) · Chemical Reviews · doi:10.1021/cr1001645 · Cited by 7,876
Shankar, K., Mor, G. K., Prakasam, H. E., Yoriya, S., Paulose, M., Varghese, O. K., & Grimes, C. A. (2007) · Nanotechnology · doi:10.1088/0957-4484/18/6/065707 · Cited by 721
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Metadata
- Authors
- Varghese, O. K., Paulose, M., Shankar, K., Mor, G. K., & Grimes, C. A.
- Venue
- Journal of Nanoscience and Nanotechnology
- Publisher
- American Scientific Publishers
- Published
- 2005-07-01
- Volume
- 5
- Issue
- 7
- Pages
- 1158-1165
- ISSN
- 1533-4880 (ISSN-L)
- 0000-0000
- OpenAlex
- W2312984851
- Cited by
- 236
- References
- 0
- FWCI
- 16.16
- Type
- journal article
- Language
- en
- Open access
- closed
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- Varghese, O. K., Paulose, M., Shankar, K., Mor, G. K., & Grimes, C. A. (2005). Water-Photolysis Properties of Micron-Length Highly-Ordered Titania Nanotube-Arrays. Journal of Nanoscience and Nanotechnology. https://doi.org/10.1166/jnn.2005.195
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