Abstract
Hematite has been recognized as a promising photoanode materials for the photoelectrochemical water splitting application. A Co–Pi/Fe2TiO5/Fe2O3 composite film has been fabricated by photo-assisted electrodeposition of Co–Pi nanoparticles on the surface of Ti-treated Fe2O3 nanorod arrays, grown perpendicularly on the FTO substrate via one-step hydrothermal method. The films were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and UV–vis diffuse reflectance spectroscopy. The photocurrent response of obtained photoanode with an enhanced photocurrent density of 1.09 and 0.75 mA/cm2 under front-side and back-side illumination compared to Fe2TiO5/Fe2O3, Co–Pi/Fe2O3, and Co–Pi/Fe2TiO5/Fe2O3, due to the suppressed charge carrier recombination and water oxidation dynamics, further indicating that the different effect for the improvement of PEC performance for the front or back sides. Meanwhile, the onset potential for front-side are also improved compared to back-side illumination. The present work demonstrates an exploration for the possible mechanism of front-side and back-side illumination effect via surface modification treatment for the improvement of PEC water splitting application.
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