Enhanced Photoelectrochemical Water Oxidation Performance of Fe2O3 Nanorods Array by S Doping

摘要

As a promising candidate for photoelectrochemical (PEC) water oxidation, the photoelectrochemical water splitting efficiency of hematite (Fe2O3) is limited by its low electron mobility. In this work, we report a new strategy for great enhancement of PEC water oxidation activity on Fe2O3. The S-doped Fe2O3 (S:Fe2O3) nanorods array on a Ti plate shows a substantially increased photocurrent density of 1.42 mA cm(-2) at 1.23 V vs RHE in 1.0 M NaOH under simulated sunlight irradiation (AM 1.5G, 100 mW cm(-2)), 2.45 times that of Fe2O3 counterpart (0.58 mA cm(-2)). Both density functional theory calculations and Energy(eV) verify that the superior activity is contributed to the enhanced electron mobility after S doping. This study offers an attractive photoanode in water-splitting devices for solar hydrogen production application.