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Understanding the Role of Nanostructures for Efficient Hydrogen Generation on Immobilized Photocatalysts

机译：了解纳米结构在固定化光催化剂上高效生氢的作用

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摘要

For the purpose of efficiently utilizing the renewable solar energy, it is of vital importance to understand the key factors that contribute to the performance merits for photocatalysis applications. In this work, we find that anatase titania nanostructures with high efficiency in photoelectrochemical cell (PEC) do not necessarily retain the same good performance when used in direct heterogeneous reaction (DHR). Investigation is carried out to elucidate how the electronic properties of the different nanostructures are correlated with the PEC and DHR efficiencies. Good PEC cell performance is identified to be related to topotactically formed samples with intimately connected particles that facilitate easy charge transfer. Additional benefit for PEC cell is found to be achieved from the vectorial conduction pathway in the pseudo one dimensional structure. On the other hand, high activity of DHR photocatalysis is attributed mainly to the exposed high reactivity crystal facets. The presence of anatase TiO_2 {010} facets is identified to enhance electron-hole separation and create specific surface states that facilitate interactions across the semiconductor/electrolyte interfaces.
机译：为了有效利用可再生太阳能，了解有助于光催化应用性能的关键因素至关重要。在这项工作中，我们发现在光电化学电池（PEC）中具有高效率的锐钛矿型二氧化钛纳米结构在直接异质反应（DHR）中使用时不一定保持相同的良好性能。进行了研究以阐明不同纳米结构的电子性质如何与PEC和DHR效率相关。良好的PEC电池性能被认为与具有紧密连接的颗粒的易于形成的样品有关，这些颗粒便于电荷转移。发现从伪一维结构中的矢量传导途径获得了对PEC细胞的额外益处。另一方面，DHR光催化的高活性主要归因于暴露的高反应性晶体面。锐钛矿型TiO_2 {010}刻面的存在可以增强电子-空穴的分离并产生特定的表面状态，从而促进半导体/电解质界面之间的相互作用。

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  • 来源
    《Advanced energy materials》 |2013年第10期|1368-1380|共13页
  • 作者

    Zhelong Jiang; Yuxin Tang; Qiuling Tay; Yanyan Zhang; Oleksandr I. Malyi; Danping Wang; Jiyang Deng; Yuekun Lai; Huanfu Zhou; Xiaodong Chen; Zhili Dong; Zhong Chen;

  • 作者单位

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore,C.N. Yang Scholars Programme Nanyang Technological University 60 Nanyang Drive, SBS-02n-45, 637551, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    National Engineering Laboratory of Modern Silk and College of Textile and Clothing Engineering Soochow University Suzhou 215123, China;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore,Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education Guilin University of Technology Cuilin, 541004, China;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

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