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    Microwave-assisted self-doping of TiO2 photonic crystals for efficient photoelectrochemical water splitting

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    Type
    Article
    Authors
    Zhang, Zhonghai cc
    Yang, Xiulin cc
    Hedhili, Mohamed N. cc
    Ahmed, Elaf S.
    Shi, Le cc
    Wang, Peng cc
    KAUST Department
    Imaging and Characterization Core Lab
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Core Labs
    Date
    2013-12-23
    Online Publication Date
    2013-12-23
    Print Publication Date
    2014-01-08
    Permanent link to this record
    http://hdl.handle.net/10754/563333
    
    Metadata
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    Abstract
    In this article, we report that the combination of microwave heating and ethylene glycol, a mild reducing agent, can induce Ti3+ self-doping in TiO2. A hierarchical TiO2 nanotube array with the top layer serving as TiO2 photonic crystals (TiO2 NTPCs) was selected as the base photoelectrode. The self-doped TiO2 NTPCs demonstrated a 10-fold increase in visible-light photocurrent density compared to the nondoped one, and the optimized saturation photocurrent density under simulated AM 1.5G illumination was identified to be 2.5 mA cm-2 at 1.23 V versus reversible hydrogen electrode, which is comparable to the highest values ever reported for TiO2-based photoelectrodes. The significant enhancement of photoelectrochemical performance can be ascribed to the rational coupling of morphological and electronic features of the self-doped TiO 2 NTPCs: (1) the periodically morphological structure of the photonic crystal layer traps broadband visible light, (2) the electronic interband state induced from self-doping of Ti3+ can be excited in the visible-light region, and (3) the captured light by the photonic crystal layer is absorbed by the self-doped interbands. © 2013 American Chemical Society.
    Citation
    Zhang, Z., Yang, X., Hedhili, M. N., Ahmed, E., Shi, L., & Wang, P. (2013). Microwave-Assisted Self-Doping of TiO2 Photonic Crystals for Efficient Photoelectrochemical Water Splitting. ACS Applied Materials & Interfaces, 6(1), 691–696. doi:10.1021/am404848n
    Sponsors
    This work was supported by KAUST baseline fund. Z.Z. is thankful for a SABIC Postdoctoral Fellowship.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/am404848n
    PubMed ID
    24328231
    ae974a485f413a2113503eed53cd6c53
    10.1021/am404848n
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Imaging and Characterization Core Lab; Water Desalination and Reuse Research Center (WDRC)

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