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Enhanced photoelectrochemical performance of LaFeO3 photocathode with Au buffer layer

机译：具有Au缓冲层的LaFeO3光电阴极的光电化学性能增强

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Due to an appropriate band gap of 2.07 eV, perovskite LaFeO _(3) (LFO) is an alternative candidate for high-efficiency photoelectrochemical (PEC) systems. However, the photocurrent of the LFO photocathode is too low to be practical. Herein, we prepared a LFO film with high crystal quality by inserting an Au thin layer between LFO and FTO in the LFO/FTO photocathode. Accordingly, an effective improvement PEC performance could be obtained and the photocurrent density of the FTO/Au/LFO electrode was increased to ?19.60 μA cm ~(?2) at 0.6 V vs. RHE, which is 4.1 times higher than that of pristine FTO/LFO electrode. Based on the experimental and theoretical analysis, the enhancement of the photocurrent was attributed to the strong light harvesting, enhanced charge separation, and increased charge-collection efficiency of the Au/LFO structure. This work provides a promising strategy to develop high-efficiency PEC electrodes, and has potential to be applied in the visible-light water splitting area.
机译：由于2.07 eV的合适带隙，钙钛矿型LaFeO_（3）（LFO）是高效光电化学（PEC）系统的替代选择。但是，LFO光电阴极的光电流太低而不能实用。本文中，我们通过在LFO / FTO光电阴极中的LFO和FTO之间插入Au薄层来制备具有高晶体质量的LFO膜。因此，在0.6V vs.RHE的条件下，可以获得有效的改善的PEC性能，FTO / Au / LFO电极的光电流密度增加到？19.60μAcm〜（？2），是原始电极的4.1倍FTO / LFO电极。根据实验和理论分析，光电流的增加归因于Au / LFO结构的强光收集，增强的电荷分离和增加的电荷收集效率。这项工作为开发高效PEC电极提供了有希望的策略，并且有潜力在可见光水分解区域中应用。

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