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Development of New Photocatalytic Water Splitting into H2 and O2 using Two Different Semiconductor Photocatalysts and a Shuttle Redox Mediator IO3-/I-
Abstract
A new type of photocatalytic reaction that splits water into H2 and O2 was designed using a two-step photoexcitation system composed of an iodate/iodide (IO3-/I-) shuttle redox mediator and two different photocatalysts, one for H2 evolution and the other for O2 evolution. Photocatalytic oxidation of water to O2 and reduction of IO3- to I- selectively proceeded with good efficiencies over TiO2-rutile and Pt-WO3 photocatalysts under UV and visible light irradiations, respectively. The O2 evolution selectively proceeded even in the presence of a considerable amount of I- in the solutions, although the oxidation of water is thermodynamically less favorable than oxidation of I-. Both the adsorption property of IO3- anions and the oxidation property of the photocatalysts are doubtless responsible for the selective oxidation of water. On the other hand, photocatalytic reduction of water to H2 and oxidation of I- to IO3- proceeded over Pt-TiO2-anatase and Pt-SrTiO3:Cr/Ta (codoped with Cr and Ta) photocatalysts under UV and visible light, respectively. The combination of two different photocatalysts results in a stoichiometric evolution of H2 and O2 via the redox cycle of IO3- and I-. The photocatalytic water splitting under visible light irradiation (lambda > 420 nm) was demonstrated by using the Pt-SrTiO3:Cr/Ta, Pt-WO3, and IO3-/I- shuttle redox mediator.
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Citations
Cited by
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Chen, X., & Mao, S. S. (2007) · Chemical Reviews · doi:10.1021/cr0500535 · Cited by 10,688
Heterogeneous photocatalyst materials for water splitting
Kudo, A., & Miseki, Y. (2009) · Chem. Soc. Rev. · doi:10.1039/b800489g · Cited by 10,585
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
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Zhou, P., Yu, J., & Jaroniec, M. (2014) · Advanced Materials · doi:10.1002/adma.201400288 · Cited by 2,317
Abe, R. (2010) · Journal of Photochemistry and Photobiology C: Photochemistry Reviews · doi:10.1016/j.jphotochemrev.2011.02.003 · Cited by 1,223
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Metadata
- Authors
- Abe, R., Sayama, K., & Sugihara, H.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-08-01
- Volume
- 109
- Issue
- 33
- Pages
- 16052-16061
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W1969111467
- Cited by
- 336
- References
- 0
- FWCI
- 7.56
- Type
- journal article
- Language
- en
- Open access
- closed
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- Abe, R., Sayama, K., & Sugihara, H. (2005). Development of New Photocatalytic Water Splitting into H2 and O2 using Two Different Semiconductor Photocatalysts and a Shuttle Redox Mediator IO3-/I-. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp052848l
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