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Photocatalytic Water Oxidation with Nonsensitized IrO2 Nanocrystals under Visible and UV Light.

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Title: Photocatalytic Water Oxidation with Nonsensitized IrO2 Nanocrystals under Visible and UV Light.
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]
Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 60863003
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PubTypeId: academicJournal
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  Data: Photocatalytic Water Oxidation with Nonsensitized IrO<subscript>2</subscript> Nanocrystals under Visible and UV Light.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Chemical+Society%22">Journal of the American Chemical Society</searchLink>. 5/18/2011, Vol. 133 Issue 19, p7264-7267. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Iridium%22">Iridium</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation+in+water+purification%22">Oxidation in water purification</searchLink><br /><searchLink fieldCode="DE" term="%22Electrocatalysis%22">Electrocatalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Ultraviolet+radiation%22">Ultraviolet radiation</searchLink>
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  Data: 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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  Data: <i>Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/ja200144w
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        Text: English
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      – SubjectFull: Iridium
        Type: general
      – SubjectFull: Nanocrystals
        Type: general
      – SubjectFull: Oxidation in water purification
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      – SubjectFull: Electrocatalysis
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      – SubjectFull: Ultraviolet radiation
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      – TitleFull: Photocatalytic Water Oxidation with Nonsensitized IrO2 Nanocrystals under Visible and UV Light.
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              Text: 5/18/2011
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              Y: 2011
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