a-Fe₂O₃/TiO₂ stratified photoanodes

Bi-layers of hematite Fe₂O₃ / TiO₂ were deposited with very low photocorrosion in the electrolyte. Fe₂O₃ hematite layers were prepared by reactive pulsed magnetron sputtering and TiO₂ layers by the sol-gel chemical method. The hematite layers annealed at 650 °C and 750 °C showed increased photo response due to doping with tin diffusing from the substrate to the layer. For Fe₂O₃ / TiO₂ bilayers, the photoactivity in the visible range was greater than for hematite layers alone, by suppressing surface recombination of the carriers at the Fe₂O₃ / electrolyte interface.

Description

Linear voltammetry of Fe₂O₃ / TiO₂ bilayers under irradiation with solar simulated light in 1 M NaOH.

Cooperating institutions: University of Chemistry and Technology Prague