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Water Splitting by Nanocrystalline TiO2 in a Complete Photoelectrochemical Cell Exhibits Efficiencies Limited by Charge Recombination
Abstract
We report on the mechanism of water splitting by TiO 2 in the absence of chemical scavengers in a fully functional photoelectrochemical (PEC) cell. The application of a positive potential to a nanocrystalline-TiO 2 film is shown to lead to the formation of long-lived holes which oxidize water on the milliseconds time scale. These first time-resolved studies of a nanocrystalline-TiO 2 (nc-TiO 2 ) film in a complete PEC cell also showed that all of the long-lived photoholes go on to generate O 2, and that there are no major branching inefficiencies in the catalysis itself, which appears to be operating at efficiencies close to 100%. The overall quantum yield of oxygen production under pulsed illumination (355 nm) was found to be ∼8% at excitation densities of 4.4 photons per particle. Under all conditions examined, electron−hole recombination was found to be the dominant loss pathway.
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Photosynthetic energy conversion: natural and artificial
Barber, J. (2009) · Chem. Soc. Rev. · doi:10.1039/b802262n · Cited by 1,843
Cited by
Photoinduced charge transfer processes in solar photocatalysis based on modified TiO 2
Park, H., Kim, H.-I., Moon, G.-H., & Choi, W. (2016) · Energy & Environmental Science · doi:10.1039/c5ee02575c · Cited by 582
Barroso, M., Cowan, A. J., Pendlebury, S. R., Grätzel, M., Klug, D. R., & Durrant, J. R. (2011) · Journal of the American Chemical Society · doi:10.1021/ja205325v · Cited by 579
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Metadata
- Authors
- Cowan, A. J., Tang, J., Leng, W., Durrant, J. R., & Klug, D. R.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-02-10
- Volume
- 114
- Issue
- 9
- Pages
- 4208-4214
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2001072375
- Cited by
- 261
- References
- 1
- FWCI
- 9.19
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Water Splitting by Nanocrystalline TiO2 in a Complete Photoelectrochemical Cell Exhibits Efficiencies Limited by Charge Recombination. https://app.cochat.ai/papers/10.1021/jp909993w
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- Cowan, A. J., Tang, J., Leng, W., Durrant, J. R., & Klug, D. R. (2010). Water Splitting by Nanocrystalline TiO2 in a Complete Photoelectrochemical Cell Exhibits Efficiencies Limited by Charge Recombination. The Journal of Physical Chemistry C. https://doi.org/10.1021/jp909993w
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