Abstract
Microstructure modification by surfactant as well as heat-treatment was found to significantly influence the photoelectrochemical properties of a hematite-Fe2O3 thin film photoanode, which was coated on fluorine-doped tin oxide (FTO) substrate via a simple dipping process in aqueous Fe(NO3)3 solution. The film treated with the surfactant TBAOH showed a substantially improved uniformity in terms of the dispersion of Fe2O3 particles on the substrate. Heat-treatment conditions were also investigated and optimized for the improvement of the performance. A photocurrent density of about 1.32 mA/cm2 at 1.23 (V vs. RHE) was obtained under 100 mW/cm2 UV-Vis light illumination for the Fe2O3 photoanode optimized with the surfactant and heat-treatment. The onset voltage for the photocurrent initiation was measured to be 0.87 (V vs. RHE). Our results suggest that application of a surfactant along with an optimized heat-treatment is a promising approach to improve the photoelectrochemical performance of the Fe2O3-based photoanode film.
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Noh, KJ., Kim, BR., Yoon, GJ. et al. Microstructural effect on the photoelectrochemical performance of hematite-Fe2O3 photoanode for water splitting. Electron. Mater. Lett. 8, 345–350 (2012). https://doi.org/10.1007/s13391-012-2007-0
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DOI: https://doi.org/10.1007/s13391-012-2007-0