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首页> 外文期刊>ChemPlusChem >Characterization of Interfacial Charge-Transfer Photoexcitation of Polychromium-Oxo-Electrodeposited TiO2 as an Earth-Abundant Photoanode for Water Oxidation Driven by Visible Light
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Characterization of Interfacial Charge-Transfer Photoexcitation of Polychromium-Oxo-Electrodeposited TiO2 as an Earth-Abundant Photoanode for Water Oxidation Driven by Visible Light

机译：用可见光驱动的水氧化作为土氧化物的界面电荷 - 电沉积TiO2的界面电荷 - 电沉积TiO2的表征

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摘要

Polychromium-oxo-deposited TiO2 ((CrxOy)-O-III/TiO2) electrodes were fabricated by a simple electrochemical technique by using different TiO2 basal electrodes (anatase, rutile, and mixed polymorphic phases P25) as earth-abundant photoanodes for visible-light-driven water oxidation. The high-resolution transmission electron microscopy (HR-TEM) observation illustrated that an (CrxOy)-O-III layer with approximately 2-3nm thickness was formed on the surface of the crystalline TiO2 particles. Upon visible-light irradiation of the electrodes, the photoanodic current based on water oxidation was generated at the (CrxOy)-O-III/TiO2 electrodes. However, the wavelength (below 620nm) for photocurrent generation at (CrxOy)-O-III/TiO2-rutile was longer than that (below 560nm) at (CrxOy)-O-III/TiO2-P25 by 60nm, which is in agreement with the difference (0.2eV) in the conduction band (CB) edge energy between rutile and anatase TiO2. This gives a quantitative account for the photocurrent generation based on interfacial charge transfer (IFCT) from Cr3d of the deposited (CrxOy)-O-III layer to the TiO2 CB. The photocurrent generated for (CrxOy)-O-III/TiO2-rutile was higher than that for (CrxOy)-O-III/TiO2-anatase, which is ascribed to 1)more effective (CrxOy)-O-III deposition on the rutile particles, 2)a larger electrolyte/(CrxOy)-O-III interface for water oxidation as a result of smaller rutile particles (ca. 30-40nm) compared with larger P25 particles (ca. 40-80nm), and 3)more effective use of visible light owing to the low energy IFCT transition of rutile.
机译：通过使用不同的TiO2基底电极（锐钛矿，金红石和混合多晶态P25）作为可见的地面光电池，通过使用不同的TiO2基础电极（锐钛矿，金红石和混合多晶相P25）通过简单的电化学技术制造多氯化铬沉积的TiO 2（（Crxoy）-O-III / TiO2）电极。轻型水氧化。在结晶TiO 2颗粒的表面上形成高分辨率透射电子显微镜（HR-TEM）观察的观察结果，在结晶TiO 2颗粒的表面上形成具有大约2-3nm的厚度的（Crxoy）-O-III层。在电极的可见光照射时，在（Crxoy）-O-III / TiO 2电极处产生基于水氧化的光电码电流。然而，在（Crxoy）-O-III / TiO 2 - 金刚石的光电流产生的波长（低于620nm）比（Crxoy）-O-III / TiO2-P25在60nm处长于（Crxoy）-O-III / TiO2-P25，这是一致的在金红石和锐钛矿TiO2之间的导通带（CB）边缘能量中的差异（0.2EV）。这给出了基于从沉积的（Crxoy）-i-III层的CR3D的界面电荷转移（IFCT）的光电流产生的定量估算症 - TiO2 Cb。对（CRXOY）-O-III / TiO2 - 金红石产生的光电流高于（CRXOY）-O-III / TiO2-锐钛矿，其归因于1）更有效（Crxoy）-O-III沉积金红石颗粒，2）由于较小的金红石颗粒（约30-40nm）与较大的P25颗粒（约40-80nm）和3）相比，用于水氧化的较大电解质/（Crxoy）-O-III界面。由于金红石的低能量IFCT过渡而更有效地利用可见光。

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  • 来源
    《ChemPlusChem》 |2016年第10期|共7页
  • 作者

    Chandra Debraj; Tsuriya Ryougen; Sato Tsubasa; Takama Daisuke; Abe Naoto; Kajita Masashi; Li Dong; Togashi Takanari; Kurihara Masato; Saito Kenji; Yui Tatsuto; Yagi Masayuki;

  • 作者单位

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Yamagata Univ Fac Sci Dept Mat &

    Biol Chem 1-4-12 Kojirakawa Machi Yamagata 9908560 Japan;

    Yamagata Univ Fac Sci Dept Mat &

    Biol Chem 1-4-12 Kojirakawa Machi Yamagata 9908560 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

    Niigata Univ Fac Engn Dept Mat Sci &

    Technol 8050 Ikarashi 2 Niigata 9502181 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

    artificial photosynthesis; interfacial charge transfer; TiO2 photoanodes; water oxidation; water splitting;

    机译：人造光合作用;界面电荷转移;TiO2光电;水氧化;水分裂;

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