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首页> 外文期刊>RSC Advances >ZnO/Ag/Ag2WO4 photo-electrodes with plasmonic behavior for enhanced photoelectrochemical water oxidation
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ZnO/Ag/Ag2WO4 photo-electrodes with plasmonic behavior for enhanced photoelectrochemical water oxidation

机译：ZnO / Ag / Ag2WO4具有等离子体行为的光电电极，用于增强光电化学水氧化

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摘要

Ag-based compounds are excellent co-catalyst that can enhance harvesting visible light and increase photo-generated charge carrier separation owing to its surface plasmon resonance ( SPR) effect in photoelectrochemical ( PEC) applications. However, the PEC performance of a ZnO/Ag/Ag2WO4 heterostructure with SPR behavior has not been fully studied so far. Here we report the preparation of a ZnO/Ag/Ag2WO4 photo-electrode with SPR behavior by a low temperature hydrothermal chemical growth method followed by a successive ionic layer adsorption and reaction ( SILAR) method. The properties of the prepared samples were investigated by different characterization techniques, which confirm that Ag/Ag2WO4 was deposited on the ZnO NRs. The Ag2WO4/Ag/ZnO photo-electrode showed an enhancement in PEC performance compared to bare ZnO NRs. The observed enhancement is attributed to the red shift of the optical absorption spectrum of the Ag2WO4/Ag/ZnO to the visible region (>400 nm) and to the SPR effect of surface metallic silver ( Ag-0) particles from the Ag/Ag2WO4 that could generate electron-hole pairs under illumination of low energy visible sun light. Finally, we proposed the PEC mechanism of the Ag2WO4/Ag/ZnO photo-electrode with an energy band structure and possible electron-hole separation and transportation in the ZnO/Ag/Ag2WO4 heterostructure with SPR effect forwater oxidation.
机译：基于Ag的化合物是优异的助催化剂，其可以增强收获的可见光并增加由于其在光电化学（PEC）应用中的表面等离子体共振（SPR）效应而增加光产生的电荷载体分离。然而，到目前为止，ZnO / Ag / Ag2WO4具有SPR行为的异质结构的PEC性能尚未完全研究。在这里，我们通过低温水热化学生长方法报告具有SPR行为的ZnO / Ag / Ag2WO4光电电极，然后进行连续离子层吸附和反应（Sill）方法。通过不同的表征技术研究制备样品的性质，其证实Ag / Ag2WO4沉积在ZnO NR上。与裸ZnO NRS相比，AG2WO4 / Ag / ZnO光电电极显示PEC性能的增强。观察到的增强归因于Ag2wO4 / Ag / ZnO至可见区域（> 400nm）的光学吸收光谱的红色移位，并从Ag / Ag2WO4中的表面金属银（Ag-0）颗粒的SPR效果这可以在低能量可见光光照的照明下产生电子孔对。最后，我们提出了具有能带结构的AG2WO4 / Ag / ZnO光电电极的PEC机理，并在ZnO / Ag / Ag2WO4异质结构中具有可能的电子空穴分离和运输，具有SPR效应氧化。

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  • 来源
    《RSC Advances》 |2019年第15期|共9页
  • 作者

    Adam Rania E.; Pirhashemi Mahsa; Elhag Sami; Liu Xianjie; Habibi-Yangjeh Aziz; Willander Magnus; Nur Omer;

  • 作者单位

    Linkoping Univ Dept Sci &

    Technol Campus Norrkoping SE-60174 Norrkoping Sweden;

    Univ Mohaghegh Ardabili Dept Chem Fac Sci POB 179 Ardebil Iran;

    Linkoping Univ Dept Sci &

    Technol Campus Norrkoping SE-60174 Norrkoping Sweden;

    Linkoping Univ Dept Phys Chem &

    Biol IFM S-58183 Linkoping Sweden;

    Univ Mohaghegh Ardabili Dept Chem Fac Sci POB 179 Ardebil Iran;

    Linkoping Univ Dept Sci &

    Technol Campus Norrkoping SE-60174 Norrkoping Sweden;

    Linkoping Univ Dept Sci &

    Technol Campus Norrkoping SE-60174 Norrkoping Sweden;

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  • 正文语种 eng
  • 中图分类 化学;
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