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Comparison of the electrochemical properties of hematite thin films prepared by spray pyrolysis and electrodeposition

机译：喷雾热解和电沉积制备赤铁矿薄膜的电化学性能比较

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摘要

This manuscript reports differences between the photoelectrochemical (PEC) activity of hematite (alpha-Fe2O3) photoanodes produced by cathodic electrodeposition (ED) and spray pyrolysis (SP) methods. Both methods yield nanostructured polycrystalline alpha-Fe2O3 thin films without additional impurity phases. However, alpha-Fe2O3 produced by ED is characterised to have better crystallinity and higher porosity, which was confirmed by XRD and SEM analysis. Owing to this, alpha-Fe2O3 a obtained by ED generates a photocurrent that is 2.5 times higher than alpha-Fe2O3 thin films prepared by SP. Furthermore, the influence of the thickness of the alpha-Fe2O3 thin films on the flat-band potential position was investigated. Mott-Schottky measurements revealed fiat-band potential shifting to more negative values, closer to the value of water red-ox potentials, providing the possibility to use these films for efficient water splitting. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：该手稿报告了通过阴极电沉积（ED）和喷雾热解（SP）方法产生的赤铁矿（α-Fe2O3）光阳极的光电化学（PEC）活性之间的差异。两种方法均产生了纳米结构的多晶α-Fe2O3薄膜，而没有其他杂质相。然而，ED制得的α-Fe2O3具有更好的结晶度和更高的孔隙率，这已经通过XRD和SEM分析得到了证实。因此，通过ED获得的α-Fe2O3a产生的光电流是通过SP制备的α-Fe2O3薄膜的2.5倍。此外，研究了α-Fe2O3薄膜的厚度对平带电势位置的影响。莫特-肖特基（Mott-Schottky）的测量结果表明，平整带电势向更多的负值移动，更接近水氧化还原电势的值，从而提供了使用这些薄膜进行有效水分解的可能性。 （C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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