In Situ Determination of Polaron-Mediated Ultrafast Electron Trapping in Rutile TiO2 Nanorod Photoanodes,The Journal of Physical Chemistry Letters

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In Situ Determination of Polaron-Mediated Ultrafast Electron Trapping in Rutile TiO2 Nanorod Photoanodes
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-11-02 , DOI: 10.1021/acs.jpclett.1c03113
Heng Zhu _{1,

2} , Shuyu Xiao ₃ , Wenguang Tu ₁ , Shicheng Yan ₄ , Tingchao He ₃ , Xi Zhu ₁ , Yingfang Yao _{1,

4} , Yong Zhou _{1,

5} , Zhigang Zou _{1,

5}

Affiliation

Mechanistic understanding of the photogenerated charge carrier dynamics in modified semiconductor photoanodes is vital for the efficient enhancement of photoelectrochemical (PEC) water splitting. Here, an in situ femtosecond (fs)-transient absorption spectroscopy (TAS) assisted spectroelectrochemistry technique is used to probe the behavior of charge carriers in rutile TiO₂ nanorod photoanodes under the different applied potentials and different density of surface polaron states that can be tuned via direct electrochemical protonation. We interpreted the background absorption with long-time decay in terms of polaron-mediated ultrafast electron trapping. The depleted surface polaron states on rutile TiO₂ nanorods can trap photogenerated electrons and endow them with a long lifetime; thus, increasing the polaron state density can enhance the charge separation efficiency and the photocurrent density of the TiO₂ nanorod electrode.

中文翻译：

金红石型 TiO2 纳米棒光阳极中极化子介导的超快电子俘获的原位测定

对改性半导体光阳极中光生载流子动力学的机理理解对于有效增强光电化学（PEC）水分解至关重要。在这里，原位飞秒 (fs)-瞬态吸收光谱 (TAS) 辅助光谱电化学技术用于探测金红石 TiO ₂纳米棒光阳极中电荷载流子在不同外加电位和不同密度的表面极化子态密度下的行为。通过直接电化学质子化。我们根据极化子介导的超快电子俘获解释了具有长时间衰减的背景吸收。金红石TiO ₂上耗尽的表面极化子态纳米棒可以捕获光生电子并赋予它们长寿命；因此，增加极化子态密度可以提高TiO ₂纳米棒电极的电荷分离效率和光电流密度。

更新日期：2021-11-11

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