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首页> 外文期刊>Energy & environmental science >Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H-2 production
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Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H-2 production

机译：多孔P掺杂石墨氮化碳纳米片用于协同增强可见光光催化H-2的生产

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摘要

Novel porous P-doped graphitic carbon nitride (g-C3N4) nanosheets were for the first time fabricated by combining P doping and thermal exfoliation strategies. The as-prepared P-doped g-C3N4 nanosheets show a high visible-light photocatalytic H-2-production activity of 1596 mu mol h(-1) g(-1) and an apparent quantum efficiency of 3.56% at 420 nm, representing one of the most highly active metal-free g-C3N4 nanosheet photocatalysts. This outstanding photocatalytic performance originates from the P-doped conjugated system and novel macroporous nanosheet morphology. Particularly, the empty midgap states (-0.16 V vs. standard hydrogen electrode) created by P doping are for the first time found to greatly extend the light-responsive region up to 557 nm by density functional theory and experimental studies, whilst the novel macroporous structure promotes the mass-transfer process and enhances light harvesting. Our study not only demonstrates a facile, eco-friendly and scalable strategy to synthesize highly efficient porous g-C3N4 nanosheet photocatalysts, but also paves a new avenue for the rational design and synthesis of advanced photocatalysts by harnessing the strong synergistic effects through simultaneously tuning and optimizing the electronic, crystallographic, surface and textural structures.
机译：结合P掺杂和热剥落策略，首次制备了新型的多孔P掺杂石墨氮化碳（g-C3N4）纳米片。制备的P掺杂的g-C3N4纳米片表现出1596 mu mol h（-1）g（-1）的高可见光光催化H-2-产生活性，在420 nm下的表观量子效率为3.56％，代表了最高效的无金属g-C3N4纳米片光催化剂之一。这种出色的光催化性能源自P掺杂的共轭体系和新颖的大孔纳米片形态。特别是，通过密度泛函理论和实验研究，首次发现由P掺杂产生的空中空态（相对于标准氢电极为-0.16 V）将光响应区域大大扩展至557 nm，而新型大孔结构促进了传质过程并增强了光收集。我们的研究不仅证明了合成高效的多孔g-C3N4纳米片状光催化剂的简便，环保和可扩展的策略，而且还通过同时调节和调节利用强大的协同效应，为先进的光催化剂的合理设计和合成开辟了一条新途径。优化电子，晶体学，表面和纹理结构。

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  • 来源
    《Energy & environmental science》 |2015年第12期|3708-3717|共10页
  • 作者

    Ran Jingrun; Ma Tian Yi; Gao Guoping; Du Xi-Wen; Qiao Shi Zhang;

  • 作者单位

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    Queensland Univ Technol, Sch Chem, Phys & Mech Engn Fac, Brisbane, Qld 4001, Australia;

    Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia|Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China;

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