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Ni-Mo-S nanoparticles modified graphitic C3N4 for efficient hydrogen evolution

机译：Ni-Mo-S纳米粒子改性石墨C3N4可有效释放氢

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摘要

Noble metal-free Ni-Mo-S nanoparticles modified graphitic C3N4 for efficient hydrogen evolution was successfully synthesized by means of a simple hydrothermal ion exchange process. This composite photocatalyst exhibits about 14 times higher photocatalytic activity of hydrogen production than that of the pure g-C3N4. Fluorescence analysis and electrochemical characterization confirmed that molybdenum sulfide and nickel sulfide as catalyst significantly enhanced the transfer of electrons on g-C3N4 and resulted in the excellent synergistic effect in photocatalytic properties. The promoted charge separation was measured by means of the EIS, photocurrent and transient fluorescence. A series of studies shown that the NixMo1-xS2 nanoparticles modified on the surface of graphitic C3N4 provided the more active sites and improved the efficiency of photo-generated charge separation with several characterizations such as SEM, XRD, XPS, element mapping, UV-vis DRS, Transient photocurrent and BET etc. and the results of which were in good agreement with each other. The composite photocatalyst g-C3N4/NixMo1-xS2 has a greater specific surface area and pore volume compared to pure g-C3N4, which is more favorable for the adsorption of dye molecules, leading to enhance the composite photocatalytic activity consequently. The excited-electron recombination process were greatly modulated with the introduce Ni-Mo-S nanoparticles on the surface of g-C3N4 and the photostability was enhanced as well. In addition, a possible reaction mechanism over eosin Y-sensitized g-C3N4/NixMo1-xS2 photocatalyst under visible light irradiation was proposed. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过简单的水热离子交换过程成功地合成了无贵金属的Ni-Mo-S纳米粒子修饰的石墨C3N4，可有效地释放氢气。这种复合光催化剂的产氢光催化活性比纯g-C3N4高约14倍。荧光分析和电化学表征证实，硫化钼和硫化镍作为催化剂显着增强了电子在g-C3N4上的转移，并在光催化性能方面产生了出色的协同作用。通过EIS，光电流和瞬态荧光测量促进的电荷分离。一系列研究表明，在石墨C3N4表面改性的NixMo1-xS2纳米颗粒提供了更多的活性位点，并通过SEM，XRD，XPS，元素映射，UV-vis等多种表征提高了光生电荷分离的效率。 DRS，瞬态光电流和BET等，其结果相互吻合。与纯g-C3N4相比，复合光催化剂g-C3N4 / NixMo1-xS2具有更大的比表面积和孔体积，更有利于染料分子的吸附，从而提高了复合光催化活性。通过在g-C3N4表面引入Ni-Mo-S纳米粒子，极大地调节了激发电子的复合过程，并增强了光稳定性。另外，提出了在可见光照射下曙红Y敏化g-C3N4 / NixMo1-xS2光催化剂可能的反应机理。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2018年第ptab期|587-597|共11页
  • 作者

    Yang Hao; Jin Zhiliang; Hu Hongyan; Bi Yingpu; Lu Gongxuan;

  • 作者单位

    North Minzu Univ, Sch Chem & Chem Engn, Yinchuan 750021, Peoples R China;

    North Minzu Univ, Sch Chem & Chem Engn, Yinchuan 750021, Peoples R China;

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

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

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

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  • 正文语种 eng
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  • 关键词

    Graphitic C3N4; g-C3N4/NixMo1-xS2 photocatalyst; Ni-Mo-S nanoparticles; Hydrogen production;

    机译：石墨C3N4;g-C3N4 / NixMo1-xS2光催化剂;Ni-Mo-S纳米粒子;产氢;

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