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Construction of Self-Healing Internal Electric Field for Sustainably Enhanced Photocatalysis

机译：持续增强光催化作用的自愈内部电场的构建

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摘要

The construction of internal electric field is generally considered an effective strategy to enhance photocatalytic performance due to its significant role in charge separation. However, static internal electric field is prone to be saturated either by inner or outer shield effect, and thus its effect on the improvement of photocatalysis can easily vanish. Here, the self-healing internal electric field is proposed and successfully endowed to a designed helical structural composite microfiber polyvinylidene fluoride/g-C3N4 (PVDF/g-C3N4) based on the bioinspired simple harmonic vibration. Importantly, the saturation and recovery of internal electric field are characterized by transient photovoltage and photoluminescence. The results indicate that the internal electric field could be saturated within about 10 min and refreshed with the assistance of rebuilt piezoelectric potential. The lifetime of photogenerated carriers is about 10(-4) s and the number of effective carriers is greatly increased in the presence of self-healing internal electric field. The results provide direct experimental evidence on the role of self-healing internal electric field in charge transfer behavior. This work represents a new design strategy of photocatalysts, and it may open up new horizons for solving energy shortage and environmental issues.
机译：内部电场的构造由于其在电荷分离中的重要作用，通常被认为是增强光催化性能的有效策略。然而，内部或外部屏蔽效应容易使静电内部电场饱和，因此其对光催化的改善的作用容易消失。在此，提出了一种自我修复的内部电场，并成功地赋予了基于生物启发的简单谐波振动设计的螺旋结构复合微纤维聚偏二氟乙烯/ g-C3N4（PVDF / g-C3N4）。重要的是，内部电场的饱和和恢复的特征在于瞬态光电压和光致发光。结果表明，内部电场可以在约10分钟内达到饱和，并在重建的压电​​势的帮助下得以刷新。光生载流子的寿命约为10（-4）s，在存在自愈内部电场的情况下，有效载流子的数量会大大增加。该结果提供了关于自愈内部电场在电荷转移行为中的作用的直接实验证据。这项工作代表了一种新的光催化剂设计策略，并且可能为解决能源短缺和环境问题开辟新的视野。

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  • 来源
    《Advanced Functional Materials》 |2019年第16期|1807934.1-1807934.9|共9页
  • 作者

    Dai Baoying; Yu Yunru; Chen Yukai; Huang Hengming; Lu Chunhua; Kou Jiahui; Zhao Yuanjin; Xu Zhongzi;

  • 作者单位

    Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn,Coll Mat Sci, 30 Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China;

    Southeast Univ, State Key Lab Bioelect, Sch Biol Sci & Med Engn, Nanjing 210096, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn,Coll Mat Sci, 30 Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn,Coll Mat Sci, 30 Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn,Coll Mat Sci, 30 Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China;

    Southeast Univ, State Key Lab Bioelect, Sch Biol Sci & Med Engn, Nanjing 210096, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Jiangsu Collaborat Innovat Ctr Adv Inorgan Funct, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn,Coll Mat Sci, 30 Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China;

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  • 关键词

    bioinspired; charge separation; microfluidics; photocatalysis; self-healing;

    机译：生物启发;电荷分离;微流控;光催化;自我修复;

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