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Enhanced photoelectrochemical and photocatalytic performance of iodine-doped titania nanotube arrays

机译：碘掺杂二氧化钛纳米管阵列的增强光电化学和光催化性能

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The paper discusses the synthesis and performance of iodine doped titania nanotube arrays exhibited under irradiation. The doping procedure was performed as an additional, electrochemical process carried out after formation of nanotube arrays via anodization of the Ti substrate. The optical and structural properties were characterized using Raman, UV-vis, photoluminescence and X-ray photoelectron spectroscopy. The surface morphology and cross-section studies performed by means of scanning electron microscopy show that the ordered tubular architecture is not influenced by the doping method. However, iodine doping causes a reduction of bandgap energy and photoluminescence intensity. The nanotubular TiO2 electrodes have been monitored by electrochemical (using cyclic voltammetry and electrochemical impedance spectroscopy) and in situ UV-vis spectroelectrochemical measurements in contact with an aqueous electrolyte. Collected results show significant differences in electrochemical activity between pure and doped titania exhibited as i.e. change of Mott-Schottky relation or shift in the onset potential when a decrease in reflectance is initiated. The photocurrent density reached 155.2 and 142.2 mu A cm(-2) for iodine doped materials when KI and HIO4 were used as iodine precursors whereas only 25.6 mu A cm(-2) was registered for pure titania nanotubes under UV-vis illumination. Moreover, doped samples are far more efficient for the photodegradation progress than undoped material leading to decomposition of over 70% of methylene blue used as a model organic pollutant. The reported studies demonstrate for the first time the detailed optical, electrochemical and photoelectrochemical studies of iodine doped nanotube arrays.
机译：本文讨论了辐照下展示碘掺杂二氧化钛纳米管阵列的合成和性能。在通过Ti衬底的阳极氧化形成之后进行掺杂程序作为在形成纳米管阵列之后进行的另外的电化学工艺。使用拉曼，UV-Vis，光致发光和X射线光电子能谱表征光学和结构性。通过扫描电子显微镜进行的表面形态和横截面研究表明，有序管状架构不受掺杂方法的影响。然而，碘掺杂导致带隙能量和光致发光强度的降低。通过电化学（使用循环伏安法和电化学阻抗谱）和原位UV-Vis光谱电化学测量与含水电解质接触的原位紫外线TiO 2电极。收集的结果表明，纯和掺杂二氧化钛之间的电化学活性差异显着差异，其显示为即，当启动反射率降低时Mott-肖特基关系或在发病潜力的变化。当Ki和HiO4用作碘前体时，光电流达到155.2℃和142.2μm，对于碘掺杂材料，而仅在UV-VIS照射下仅针对纯二氧化钛纳米管注册25.6μm（-2）。此外，掺杂的样品对于光降解进展比未掺杂的材料更有效，导致超过70％的亚甲基蓝色的亚甲基蓝色。报告的研究首次证明了碘掺杂纳米管阵列的详细光学，电化学和光电化学研究。

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  • 来源
    《RSC Advances》 |2015年第62期|共13页
  • 作者

    Siuzdak Katarzyna; Szkoda Mariusz; Sawczak Miroslaw; Lisowska-Oleksiak Anna; Karczewski Jakub; Ryl Jacek;

  • 作者单位

    Polish Acad Sci Szewalski Inst Fluid Flow Machinery Ctr Plasma &

    Laser Engn PL-80231 Gdansk Poland;

    Gdansk Univ Technol Fac Chem Dept Chem &

    Technol Funct Mat PL-80233 Gdansk Poland;

    Polish Acad Sci Szewalski Inst Fluid Flow Machinery Ctr Plasma &

    Laser Engn PL-80231 Gdansk Poland;

    Gdansk Univ Technol Fac Chem Dept Chem &

    Technol Funct Mat PL-80233 Gdansk Poland;

    Gdansk Univ Technol Fac Appl Phys &

    Math PL-80233 Gdansk Poland;

    Gdansk Univ Technol Dept Electrochem Corros &

    Mat Engn PL-80233 Gdansk Poland;

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