Abstract Based on the bare hematite prepared by a facile anodic electrodeposition, Ti(OBu)4 modified hematite through FeOOH film surface is a better method for obtaining more excellent photoelectrochemical performance. This is due to the significantly increased bulk charge separation efficiency caused by the refined grain, preferred orientation of (110) plane and higher donor density. Coupled with Cobalt Iron Oxide (CIO) nanoparticles, Ti(OBu)4 modified hematite photoanode has a 3 times enhanced photocurrent density of 1.02 mA cm−2 and a negative shift of onset potential about 40 mV compared with bare hematite photoanode. In which, Ti(OBu)4 can increase the electron-hole separation and passivate the surface trap states simultaneously. The CIO nanoparticles coated on the surface of Ti/FeOOH sample not only act as a catalyst for promoting the surface hole injection for water oxidation, but also boost the charge separation with passivating the surface states. This work provides an indepth understanding of the effect of Ti(OBu)4 and CIO nanoparticles on morphology, crystalline structure and photoelectrochemical performance of anodic electrodeposited hematite photoanode via systematical characterization with scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis spectra, X-ray diffractometry (XRD), X-ray photoelectron spectra (XPS), and photoelectrical measurements.

中文翻译：

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Ti(OBu) 4 和钴铁氧化物共修饰的赤铁矿纳米颗粒通过简便的阳极电沉积合成用于高效水氧化

摘要 基于通过简易阳极电沉积制备的裸赤铁矿，通过FeOOH薄膜表面Ti(OBu)4改性赤铁矿是获得更优异光电化学性能的更好方法。这是由于细化晶粒、(110) 面的择优取向和更高的施主密度引起的大量电荷分离效率显着提高。与钴铁氧化物 (CIO) 纳米颗粒相结合，Ti(OBu)4 改性赤铁矿光阳极与裸赤铁矿光阳极相比，光电流密度提高了 3 倍，为 1.02 mA cm-2，起始电位负移约 40 mV。其中，Ti(OBu)4 可以增加电子-空穴分离并同时钝化表面陷阱态。涂覆在 Ti/FeOOH 样品表面的 CIO 纳米粒子不仅作为催化剂促进水氧化的表面空穴注入，而且通过钝化表面态促进电荷分离。这项工作通过使用扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、UV 进行系统表征，深入了解 Ti(OBu)4 和 CIO 纳米粒子对阳极电沉积赤铁矿光阳极的形态、晶体结构和光电化学性能的影响。 – 可见光谱、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和光电测量。