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首页> 外文期刊>Inorganic Chemistry Frontiers >Controlled growth of ZnS/ZnO heterojunctions on porous biomass carbons via one-step carbothermal reduction enables visible-light-driven photocatalytic H-2 production
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Controlled growth of ZnS/ZnO heterojunctions on porous biomass carbons via one-step carbothermal reduction enables visible-light-driven photocatalytic H-2 production

机译：通过一步式碳热还原对多孔生物质碳的ZnS / ZnO杂交碳的增长使得可见光驱动的光催化H-2产生

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摘要

For visible-light-driven H-2 production, rational design of heterojunction photocatalysts might be a feasible strategy to achieve enhanced H-2 evolution efficiency. Herein, we prepared ZnS/ZnO heterojunctions highly dispersed on porous biomass carbons (ZnS/ZnO@C) through a one-step carbothermal reduction process at elevated temperatures. By means of the proposed synthetic pathway, the ZnS/ZnO@C composites were enabled with visible-light-driven photocatalytic capacity, despite either ZnS or ZnO being catalytically inactive for H-2 production under visible irradiation. The as-prepared photocatalyst with a 1 : 1 mole ratio of zinc and carbon sources at 800 degrees C displayed an optimal H-2 production rate of ca. 37.1 mu mol h(-1) g(-1). TEM images and UV-DRS spectra suggested that the formation of ZnS/ZnO heterojunctions would induce the generation of oxygen defects in ZnO to greatly promote visible light adsorption. Electrochemistry analyses and time-resolved photoluminescence spectra demonstrated that more efficient separation of photo-induced carriers took place via the interfaces of ZnO/ZnS heterojunctions, prolonging the charge separation lifetime. Moreover, porous biomass carbons would serve as electron conductors to efficiently improve the photo-induced electron transfer from the bulk of ZnS/ZnO to surfaces for boosting the reduction of H2O to H-2. The ZnS/ZnO heterojunctions with oxygen defects coupled with porous biomass carbons jointly achieved highly efficient H-2 production under visible irradiation. This work thus provided a facile means by using low-cost porous biomass carbons to design robust and flexible photocatalysts for visible-light-driven H-2 production with high efficiency.
机译：对于可见光驱动的H-2生产，异质结光催化剂的合理设计可能是实现增强的H-2演化效率的可行策略。在此，我们制备高度分散在多孔生物质碳（ZnS / ZnO @ C）上的ZnS / ZnO异质结，通过在升高的温度下进行一步的碳热还原过程。借助于所提出的合成途径，尽管ZnS或ZnO在可见光照射下，ZnS或ZnO具有可见光的光催化容量，但ZnS / ZnO @ C复合材料具有可见光的光催化容量。锌和800摄氏度的锌和碳源的AS制备的光催化剂显示了CA的最佳H-2生产率。 37.1μmolH（-1）g（-1）。 TEM图像和UV-DRS光谱表明，ZnS / ZnO异质结的形成将诱导ZnO中的氧缺陷的产生，以大大促进可见光吸附。电化学分析和时间分辨光致发光光谱证明了通过ZnO / ZnS异质结的界面进行光诱导载体的更有效分离，延长电荷分离寿命。此外，多孔生物质碳将用作电子导体，以有效地改善从大部分ZnS / ZnO到表面的光诱导的电子转移，以提高H2O至H-2的还原。具有氧缺陷的ZnS / ZnO异质结合与多孔生物质碳结合，在可见的照射下共同实现高效的H-2产生。因此，通过使用低成本多孔生物质碳来设计具有高效率的可见光H-2生产的坚固且柔性光催化剂的容易性装置。

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  • 来源
    《Inorganic Chemistry Frontiers》 |2019年第8期|共8页
  • 作者

    Huang Hai-Bo; Yu Kai; Wang Jun-Tao; Zhou Jun-Ru; Li Hong-Fang; Lu Jian; Cao Rong;

  • 作者单位

    Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Coll Resources &

    Environm Fujian Prov Key Lab Soil Environm Hlth &

    Regulat Fuzhou 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Coll Resources &

    Environm Fujian Prov Key Lab Soil Environm Hlth &

    Regulat Fuzhou 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Coll Resources &

    Environm Fujian Prov Key Lab Soil Environm Hlth &

    Regulat Fuzhou 350002 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Fujian Peoples R China;

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  • 正文语种 eng
  • 中图分类 无机化学;
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