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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：具有等离子行为的ZnO / Ag / Ag2WO4光电电极可增强光电化学水氧化

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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/Ag _(2) WO _(4) heterostructure with SPR behavior has not been fully studied so far. Here we report the preparation of a ZnO/Ag/Ag _(2) WO _(4) 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/Ag _(2) WO _(4) was deposited on the ZnO NRs. The Ag _(2) WO _(4) /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 Ag _(2) WO _(4) /Ag/ZnO to the visible region (>400 nm) and to the SPR effect of surface metallic silver (Ag ~(0) ) particles from the Ag/Ag _(2) WO _(4) that could generate electron–hole pairs under illumination of low energy visible sun light. Finally, we proposed the PEC mechanism of the Ag _(2) WO _(4) /Ag/ZnO photo-electrode with an energy band structure and possible electron–hole separation and transportation in the ZnO/Ag/Ag _(2) WO _(4) heterostructure with SPR effect for water oxidation.
机译：基于银的化合物是出色的助催化剂，由于其在光电化学（PEC）应用中的表面等离振子共振（SPR）效应，可以增强可见光的捕获并增加光生电荷载流子的分离。但是，到目前为止，尚未对具有SPR行为的ZnO / Ag / Ag _（2）WO _（4）异质结构的PEC性能进行全面研究。在这里，我们报告通过低温水热化学生长方法，然后进行连续的离子层吸附和反应（SILAR）方法制备具有SPR行为的ZnO / Ag / Ag _（2）WO _（4）光电极。通过不同的表征技术研究了制备样品的性能，证实了Ag / Ag _（2）WO _（4）沉积在ZnO NRs上。与裸露的ZnO NRs相比，Ag _（2）WO _（4）/ Ag / ZnO光电极显示出PEC性能的增强。观察到的增强归因于Ag _（2）WO _（4）/ Ag / ZnO的光吸收光谱向可见区（> 400 nm）的红移以及表面金属银（Ag来自Ag / Ag _（2）WO _（4）的〜（0））粒子在低能可见光的照射下可能产生电子-空穴对。最后，我们提出了具有能带结构的Ag _（2）WO _（4）/ Ag / ZnO光电极的PEC机理，以及ZnO / Ag / Ag _（2）中可能的电子-空穴分离和传输。 WO_（4）具有SPR效应的异质结构用于水氧化。

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