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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.

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