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首页> 外文期刊>Advanced Materials >A Photoresponsive Rutile TiO_2 Heterojunction with Enhanced Electron-Hole Separation for High-Performance Hydrogen Evolution
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A Photoresponsive Rutile TiO_2 Heterojunction with Enhanced Electron-Hole Separation for High-Performance Hydrogen Evolution

机译：具有增强的电子-空穴分离的光响应性金红石TiO_2异质结，可实现高性能的氢气释放

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摘要

Rutile titanium dioxide (TiO2) is a promising photocatalyst due to its high thermodynamic stability and few intragrain defects. However, it has not yet achieved photocatalytic activity comparable to that of anatase TiO2 owing to its higher recombination rate of electron-hole pairs. To effectively separate the electron-hole pairs in rutile TiO2, a facet heterojunction (FH) structure to prolong the lifetime of the photogenerated electrons is proposed. Ultrathin TiO2 nanosheets with different facets are coated in situ onto TiO2 nanorod (NR) substrates, where FHs are built among the nanosheets as well as between the nanosheets and NR substrates. The as-prepared rutile TiO2, with an FH structure (FH-TiO2), serves as an effective photocatalyst for water splitting. More than 45 and 18 times higher photogenerated current density and H-2 production rate, respectively, are obtained compared to those of pure rutile TiO2 NRs. Moreover, FH-TiO2 delivers a 0.566 mmol g(-1) h(-1) H-2 production rate even in pure water. This study offers important insights into the rational design of rutile TiO2 structures for highly efficient photocatalytic reactions.
机译：金红石型二氧化钛（TiO2）具有很高的热力学稳定性和极小的晶粒内缺陷，是一种很有前途的光催化剂。然而，由于其高的电子-空穴对复合率，它还没有达到与锐钛矿型TiO 2相当的光催化活性。为了有效分离金红石型TiO2中的电子-空穴对，提出了一种小平面异质结（FH）结构，以延长光生电子的寿命。将具有不同刻面的超薄TiO2纳米片原位涂覆到TiO2纳米棒（NR）基板上，在纳米片之间以及纳米片和NR基板之间建立FH。所制备的具有FH结构（FH-TiO2）的金红石型TiO2可作为有效的水分解光催化剂。与纯金红石型TiO2 NR相比，光生电流密度和H-2生产率分别提高了45倍和18倍以上。此外，即使在纯水中，FH-TiO2仍可提供0.566 mmol g（-1）h（-1）H-2的生产率。这项研究为金红石型TiO2结构的合理设计提供了重要的见解，以进行高效的光催化反应。

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  • 来源
    《Advanced Materials》 |2019年第8期|1806596.1-1806596.6|共6页
  • 作者

    Gao Chaomin; Wei Tao; Zhang Yanyan; Song Xiaohan; Huan Yu; Liu Hong; Zhao Mingwen; Yu Jinghua; Chen Xiaodong;

  • 作者单位

    Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China;

    Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Shandong, Peoples R China;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

    Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China|Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China;

    Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Shandong, Peoples R China;

    Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China;

    Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China|Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China;

    Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China;

    Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore;

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

    charge separation; facet heterojunction; rutile TiO2; water splitting;

    机译：电荷分离;面异质结;金红石型TiO2;水分解;

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