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首页> 外文期刊>Nanoscale Research Letters >Enhanced photoelectrocatalytic performance of α-Fe2O3 thin films by surface plasmon resonance of Au nanoparticles coupled with surface passivation by atom layer deposition of Al2O3
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Enhanced photoelectrocatalytic performance of α-Fe2O3 thin films by surface plasmon resonance of Au nanoparticles coupled with surface passivation by atom layer deposition of Al2O3

机译：Au纳米粒子的表面等离子体激元共振结合Al 2 2 O 3 薄膜的光电催化性能> O 3

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摘要

The short lifetime of photogenerated charge carriers of hematite (α-Fe~(2)O~(3)) thin films strongly hindered the PEC performances. Herein, α-Fe~(2)O~(3) thin films with surface nanowire were synthesized by electrodeposition and post annealing method for photoelectrocatalytic (PEC) water splitting. The thickness of the α-Fe~(2)O~(3) films can be precisely controlled by adjusting the duration of the electrodeposition. The Au nanoparticles (NPs) and Al~(2)O~(3) shell by atom layer deposition were further introduced to modify the photoelectrodes. Different constructions were made with different deposition orders of Au and Al~(2)O~(3) on Fe~(2)O~(3) films. The Fe~(2)O~(3)-Au-Al~(2)O~(3) construction shows the best PEC performance with 1.78 times enhancement by localized surface plasmon resonance (LSPR) of NPs in conjunction with surface passivation of Al~(2)O~(3) shells. Numerical simulation was carried out to investigate the promotion mechanisms. The high PEC performance for Fe~(2)O~(3)-Au-Al~(2)O~(3) construction electrode could be attributed to the Al~(2)O~(3) intensified LSPR, effective surface passivation by Al~(2)O~(3) coating, and the efficient charge transfer due to the Fe~(2)O~(3)-Au Schottky junctions.
机译：赤铁矿（α-Fe〜（2）O〜（3））薄膜的光生载流子寿命短，严重阻碍了PEC的性能。本文通过电沉积和后退火方法合成了具有表面纳米线的α-Fe〜（2）O〜（3）薄膜，用于光电催化（PEC）水分解。 α-Fe〜（2）O〜（3）膜的厚度可以通过调节电沉积的持续时间来精确控制。通过原子层沉积进一步引入了金纳米颗粒（NPs）和Al〜（2）O〜（3）壳层，以修饰光电极。在Fe〜（2）O〜（3）薄膜上，以Au和Al〜（2）O〜（3）的沉积顺序不同，形成了不同的结构。 Fe〜（2）O〜（3）-Au-Al〜（2）O〜（3）结构表现出最佳的PEC性能，通过NP的局部表面等离振子共振（LSPR）结合NP的表面钝化，将PEC性能提高了1.78倍Al〜（2）O〜（3）壳通过数值模拟研究了促进机理。 Fe〜（2）O〜（3）-Au-Al〜（2）O〜（3）构造电极的高PEC性能归因于Al〜（2）O〜（3）增强LSPR，有效​​表面Fe〜（2）O〜（3）-Au Schottky结使Al〜（2）O〜（3）涂层钝化，有效电荷转移。

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