Cooperative effects of surface and interface treatments in a hematite (α-Fe2O3) photo-anode on its photo-electrochemical performance,Sustainable Energy & Fuels

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Cooperative effects of surface and interface treatments in a hematite (α-Fe2O3) photo-anode on its photo-electrochemical performance
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-01-06 , DOI: 10.1039/c9se01081e
Mika Inaba _{1,

2,

3,

4,

5} , Kenji Katayama _{1,

2,

3,

4,

5} , Woon Yong Sohn _{1,

2,

3,

4,

5}

Affiliation

To enhance the efficiency of the oxygen evolution reaction of hematite (α-Fe₂O₃), we engineered both the surface of the hematite nanorods and the FTO/hematite interface simultaneously with an optimal annealing condition. We demonstrated that the enhancement of the photo-electrochemical performance of the hematite film treated by both methods was not just the summation of the improvements originating from each treatment but showed a significant cooperative effect. We clearly revealed that the strong electric field was effectively induced by the surface P doping with the concentration gradient profile, resulting in band bending even at 0 V vs. RHE. Furthermore, the dead layer was removed by the TiO₂ underlayer, giving rise to Fermi level unpinning. We confirmed that the introduction of the TiO₂ underlayer unpinning Fermi level enables building on the strength of the intrinsic long-lived holes generated by P doping, which is the origin of the cooperative effect.

中文翻译：

赤铁矿（α-Fe2O3）光阳极中表面和界面处理的协同作用对其光电化学性能的影响

为了增强赤铁矿（α-Fe的析氧反应的效率₂ ö ₃），我们工程改造的赤铁矿纳米棒的两个表面，并具有最佳退火条件的FTO /赤铁矿同时接口。我们证明了通过两种方法处理的赤铁矿膜的光电化学性能的增强不仅是每种处理带来的改进的总和，而且还显示出显着的协同作用。我们清楚地揭示了强电场是由表面P掺杂浓度梯度曲线有效诱导的，甚至在0 V vs. RHE时也导致能带弯曲。此外，通过TiO ₂去除了死层。底层，导致费米能级松动。我们证实，引入不固定费米能级的TiO ₂底层可以使由P掺杂产生的本征长寿命空穴的强度得以增强，这是协同效应的起源。

更新日期：2020-01-06

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