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Frame FA, Townsend TK, Chamousis RL, et al. Photocatalytic water oxidation with nonsensitized IrO2 nanocrystals under visible and UV light. J Am Chem Soc. 2011;133(19):7264-7doi: 10.1021/ja200144w.
Frame, F. A., Townsend, T. K., Chamousis, R. L., Sabio, E. M., Dittrich, T., Browning, N. D., & Osterloh, F. E. (2011). Photocatalytic water oxidation with nonsensitized IrO2 nanocrystals under visible and UV light. Journal of the American Chemical Society, 133(19), 7264-7. https://doi.org/10.1021/ja200144w
Frame, F Andrew, et al. "Photocatalytic water oxidation with nonsensitized IrO2 nanocrystals under visible and UV light." Journal of the American Chemical Society vol. 133,19 (2011): 7264-7. doi: https://doi.org/10.1021/ja200144w
Frame FA, Townsend TK, Chamousis RL, Sabio EM, Dittrich T, Browning ND, Osterloh FE. Photocatalytic water oxidation with nonsensitized IrO2 nanocrystals under visible and UV light. J Am Chem Soc. 2011 May 18;133(19):7264-7. doi: 10.1021/ja200144w. Epub 2011 Apr 27. PMID: 21524069.
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J Am Chem Soc. 2011 May 18;133(19):7264-7. doi: 10.1021/ja200144w. Epub 2011 Apr 27.

Photocatalytic water oxidation with nonsensitized IrO2 nanocrystals under visible and UV light.

Journal of the American Chemical Society

F Andrew Frame, Troy K Townsend, Rachel L Chamousis, Erwin M Sabio, Th Dittrich, Nigel D Browning, Frank E Osterloh

Affiliations

  1. Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, USA.

PMID: 21524069 DOI: 10.1021/ja200144w

Abstract

Rutile IrO(2) is known as being among the best electrocatalysts for water oxidation. Here we report on the unexpected photocatalytic water oxidation activity of 1.98 nm ± 0.11 nm succinic acid-stabilized IrO(2) nanocrystals. From aqueous persulfate and silver nitrate solution the nonsensitized particles evolve oxygen with initial rates up to 0.96 μmol min(-1), and with a quantum efficiency of at least 0.19% (measured at 530 nm). The catalytic process is driven by visible excitations from the Ir-d(t(2g)) to the Ir-d(e(g)) band (1.5-2.75 eV) and by ultraviolet excitations from the O-p band to the Ir-d(e(g)) (>3.0 eV) band. The formation of the photogenerated charge carriers can be directly observed with surface photovoltage spectroscopy. The results shed new light on the role of IrO(2) in dye- and semiconductor-sensitized water splitting systems.

© 2011 American Chemical Society

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