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Conduction and Valence Band Positions of Ta2O5, TaON, and Ta3N5 by UPS and Electrochemical Methods
Abstract
The conduction and valence band edges for electronic band gaps and Fermi levels are determined for Ta 2 O 5, TaON, and Ta 3 N 5 by ultraviolet photoelectron spectroscopy (UPS) and electrochemical analyses. Reasonable agreement between the results of the two methods is obtained at the pH at which the ζ potentials of the particles are zero. The tops of the valence bands are found to be shifted to higher potential energies on the order Ta 2 O 5 < TaON < Ta 3 N 5, whereas the bottoms of the conduction bands are very similar in the range −0.3 to −0.5 V (vs NHE at pH = 0). From the results, it is concluded that TaON and Ta 3 N 5 are promixing catalysts for the reduction and oxidation of water using visible light in the ranges λ < 520 nm and λ < 600 nm, respectively. It is also demonstrated that the proposed UPS technique is a reliable alternative to electrochemical analyses for determining the absolute band gap positions for materials in aqueous solutions that would otherwise be difficult to measure using electrochemical methods.
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Metadata
- Authors
- Chun, W.-J., Ishikawa, A., Fujisawa, H., Takata, T., Kondo, J. N., Hara, M., Kawai, M., Matsumoto, Y., & Domen, K.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-01-25
- Volume
- 107
- Issue
- 8
- Pages
- 1798-1803
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2087325875
- Cited by
- 1,029
- References
- 1
- FWCI
- 8.44
- Type
- journal article
- Language
- en
- Open access
- closed
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