Photocatalytic Water Oxidation with Nonsensitized IrO2 Nanocrystals under Visible and UV Light.
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| Title: | Photocatalytic Water Oxidation with Nonsensitized IrO |
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| Authors: | Frame, F. Andrew1, Townsend, Troy K.1, Chamousis, Rachel L.1, Sabio, Erwin M.1, Dittrich, Th.2, Browning, Nigel D.3, Osterloh, Frank E.1 fosterloh@ucdavis.edu |
| Source: | Journal of the American Chemical Society. 5/18/2011, Vol. 133 Issue 19, p7264-7267. 4p. |
| Subjects: | Iridium, Nanocrystals, Oxidation in water purification, Electrocatalysis, Ultraviolet radiation |
| Abstract: | Rutile IrO2 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 IrO2 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(t2g) to the Ir-d(eg) band (1.5-2.75 eV) and by ultraviolet excitations from the O-p band to the Ir-d(eg) (>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 IrO2 in dye- and semiconductor-sensitized water splitting systems. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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