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首页> 外文期刊>Applied Surface Science >Facile one-step hydrothermal synthesis toward strongly coupled TiO2/graphene quantum dots photocatalysts for efficient hydrogen evolution
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Facile one-step hydrothermal synthesis toward strongly coupled TiO2/graphene quantum dots photocatalysts for efficient hydrogen evolution

机译：面向强耦合TiO2 /石墨烯量子点光催化剂的一步式水热合成，可高效制氢

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摘要

The coupling of semiconductor photocatalysts with graphene quantum dots (GQDs) has been proven to be an effective strategy to enhance the photocatalytic and photoelectrical conversion performances of the resulted composites; however, the preparation of semiconductor/GQDs composites usually involves several time-inefficient and tedious post-treatment steps. Herein, we present a facile one-step hydrothermal route for the preparation of GQDs coupled TiO2 (TiO2/GQDs) photocatalysts using 1,3,6-trinitropyrene (TNP) as the sole precursor of GQDs. During the hydrothermal process, TNP molecules undergo an intramolecular fusion to form GQDs, which simultaneously decorate on the surface of TiO2 nanopartides, leading to a strong surface interaction between the two components. The effective coupling of GQDs on TiO2 can effectively extend the light absorption of the TiO2 to visible region and enhance the charge separation efficiency of TiO2/GQDs composites as a result of GQDs acting as a photosensitizer and an excellent electron acceptor. These key advances make the TiO2/GQDs photocatalyst highly active towards the H-2 evolution reaction, resulting in 7 and 3 times higher H-2 evolution rate and photocurrent response at optimal GQDs content than TiO2 alone, respectively. This study provides a new methodology for the development of high-performance GQDs modified semiconductor photocatalysts for energy conversion applications. (C) 2016 Elsevier B.V. All rights reserved.
机译：业已证明，将半导体光催化剂与石墨烯量子点（GQD）偶联是提高所得复合材料的光催化和光电转化性能的有效策略。然而，半导体/ GQDs复合材料的制备通常涉及几个时间效率低下且繁琐的后处理步骤。在这里，我们提出了一种简便的一步法水热路线，以1,3,6-三硝基py（TNP）作为GQD的唯一前体来制备GQD耦合的TiO2（TiO2 / GQDs）光催化剂。在水热过程中，TNP分子经历分子内融合形成GQD，同时在TiO2纳米粒子的表面上修饰，从而导致两种组分之间发生强烈的表面相互作用。由于GQD充当光敏剂和出色的电子受体，GQD在TiO2上的有效偶联可以有效地将TiO2的光吸收扩展到可见光区域，并提高TiO2 / GQDs复合材料的电荷分离效率。这些关键的进展使TiO2 / GQDs光催化剂对H-2析出反应具有很高的活性，在最佳GQDs含量下，H-2析出速率和光电流响应分别比单独的TiO2高7到3倍。这项研究为开发用于能量转换应用的高性能GQDs改性半导体光催化剂提供了一种新方法。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第2期|1375-1382|共8页
  • 作者

    Min Shixiong; Hou Jianhua; Lei Yonggang; Ma Xiaohua; Lu Gongxuan;

  • 作者单位

    Beifang Univ Nationalities, Sch Chem & Chem Engn, Yinchuan 750021, Ningxia Provinc, Peoples R China;

    Beifang Univ Nationalities, Sch Chem & Chem Engn, Yinchuan 750021, Ningxia Provinc, Peoples R China;

    Beifang Univ Nationalities, Sch Chem & Chem Engn, Yinchuan 750021, Ningxia Provinc, Peoples R China;

    Beifang Univ Nationalities, Sch Chem & Chem Engn, Yinchuan 750021, Ningxia Provinc, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    TiO2; Graphene quantum dots; Hydrothermal synthesis; Photocatalyst; Hydrogen evolution;

    机译：TiO2;石墨烯量子点;水热合成;光催化剂;氢演化;

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