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Ferrihydrite‐Modified Ti–Fe2O3 as an Effective Photoanode: The Role of Interface Interactions in Enhancing the Photocatalytic Activity of Water Oxidation
ChemSusChem ( IF 8.4 ) Pub Date : 2018-09-03 , DOI: 10.1002/cssc.201801406
Qijing Bu 1 , Shuo Li 2 , Qiannan Wu 1 , Lingling Bi 1 , Yanhong Lin 1 , Dejun Wang 1 , Xiaoxin Zou 3 , Tengfeng Xie 1
Affiliation  

Semiconductor electrodes integrated with cocatalysts are key components of photoelectrochemistry (PEC)‐based solar‐energy conversion. However, efforts to optimize the PEC device have been limited by an inadequate understanding of the interface interactions between the semiconductor–cocatalyst (sem|cat) and cocatalyst–electrolyte (cat|ele) interface. In our work, we used ferrihydrite (Fh)‐modified Ti–Fe2O3 as a model to explore the transfer process of photogenerated charge carriers between the Ti–Fe2O3–Fh (Ti–Fe2O3|Fh) interface and Fh‐electrolyte (Fh|ele) interface. The results demonstrate that the biphasic structure (Fh/Ti–Fe2O3) possesses the advantage that the minority hole transfer from Ti–Fe2O3 to Fh is driven by the interfacial electric field at the Ti–Fe2O3|Fh interface; meanwhile, the holes reached at the surface of Fh can rapidly inject into the electrolyte across the Fh|ele interface. As a benefit from the improved charge transfer at the Ti–Fe2O3|Fh and Fh|ele interface, the photocurrent density obtained by Fh/Ti–Fe2O3 can reach 2.32 mA cm−2 at 1.23 V versus RHE, which is three times higher than that of Ti–Fe2O3.

中文翻译:

水铁矿改性的Ti-Fe2O3作为有效的光电阳极:界面相互作用在增强水氧化的光催化活性中的作用

集成有助催化剂的半导体电极是基于光化学(PEC)的太阳能转换的关键组成部分。然而,由于对半导体-助催化剂(sem | cat)和助催化剂-电解质(cat | ele)界面之间的界面相互作用的了解不足,因此限制了PEC设备的优化工作。在我们的工作中,我们使用水铁矿(Fh)改性的Ti–Fe 2 O 3作为模型,探索了光生载流子在Ti–Fe 2 O 3 –Fh(Ti–Fe 2 O 3 | Fh)之间的转移过程。界面和Fh-电解质(Fh | ele)界面。结果表明,双相结构(Fh / Ti–Fe 2 O 3)具有Ti-Fe 2 O 3 | Fh界面处的界面电场驱动从Ti–Fe 2 O 3到Fh的少数空穴转移的优点;同时,到达Fh表面的空穴可以通过Fhele接口迅速注入到电解质中。通过改善Ti-Fe 2 O 3 | Fh和Fh | ele界面处的电荷转移,通过Fh / Ti-Fe 2 O 3获得的光电流密度在1.23 V时可达到RHE的2.32 mA cm -2,这是Ti-Fe 2 O 3的三倍。
更新日期:2018-09-03
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