Abstract
Array growth of hematite nanorod films on fluorine-doped tin oxide (FTO) coated glass substrate was obtained by a modified hydrothermal method, and SnO2@-Fe2O3 nanocomposite was subsequently achieved by a simple room temperature chemical solution method. Adjusting the concentration of tin (IV) chloride ethanol solution can tailor the length of hematite nanorod arrays and modify photoelectrochemical (PEC) characteristics of hematite films. Desirable concentration of 20 mg/mL SnCl4 · 5H2O can enhance the PEC performance of hematite nanorod arrays. [110]oriented SnO2@-Fe2O3 rod-like nanocomposite exhibited higher carrier density of 178×10 21 cm −3 and higher photocurrent density of 3.97 mA/cm 2 at 0.6 V versus Ag/AgCl, which is almost three times higher than that of pure hematite films. Improved PEC performance was correlated with changes in both surface morphology and indirect band gap of the array nanorod films due to multicomponent SnO2@-Fe2O3 nanocomposite. While these results present a significant breakthrough in demonstrating the promise of the modified hematite arrays, considerable opportunities remain for improvement. This new finding will provide a new direction to enhance photoelectrochemical characteristics of hematite, one of the best potential photoanode materials for solar cells.
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