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Issue 10, 2012
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Plasmonic Ag@Ag3(PO4)1−x nanoparticle photosensitized ZnO nanorod-array photoanodes for water oxidation

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Abstract

We report the new design of a high-activity model for photocatalytic nanosystem comprising an Ag core covered with an approximately 2 nm thick nanoshell of Ag3(PO4)1–x (Ag@Ag3(PO4)1–x) on the ZnO NRs that are visible-light-sensitive photofunctional electrodes with strong photooxidative capabilities to evolve O2 from water. The maximum photoconversion efficiency that could be successfully achieved was 2%, with a significant photocurrent of 3.1 mA cm−2. Furthermore, in addition to achieving a maximum IPCE value of 90%, it should be noted that the IPCE of Ag@Ag3(PO4)1−x photosensitized ZnO photoanodes at the monochromatic wavelength of 400 nm is up to 60%. Our photoelectrochemical performances are comparable to those of many oxide-based photoanodes in recent reports. The improvement in photoactivity of PEC water-splitting may be attributed to the enhanced near-field amplitudes resulting from localized surface plasmon resonance (LSPR) of Ag–core and absorption edge of the Ag3(PO4)1−x nanoshell, which increase the rate of formation of electron–hole pairs at the nearby surface of Ag3(PO4)1−x nanoshell and ZnO nanorod, thus enlarging the amount of photogenerated charge contributing to photocatalysis. The capability of developing highly photoactive Ag@Ag3(PO4)1−x-photosensitized ZnO photoanodes opens up new opportunities in various photocatalytic areas, particularly solar-hydrogen fields.

Graphical abstract: Plasmonic Ag@Ag3(PO4)1−x nanoparticle photosensitized ZnO nanorod-array photoanodes for water oxidation

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Publication details

The article was received on 08 May 2012, accepted on 10 Aug 2012 and first published on 13 Aug 2012


Article type: Communication
DOI: 10.1039/C2EE22185C
Citation: Energy Environ. Sci., 2012,5, 8917-8922
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    Plasmonic Ag@Ag3(PO4)1−x nanoparticle photosensitized ZnO nanorod-array photoanodes for water oxidation

    Y. Lin, Y. Hsu, Y. Chen, S. Wang, J. T. Miller, L. Chen and K. Chen, Energy Environ. Sci., 2012, 5, 8917
    DOI: 10.1039/C2EE22185C

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