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[EN] Iron oxide nanostructures are promising materials for photoelectrochemical applications such as water
splitting. In this work, electrochemical anodization of iron is used to form different iron oxide nanostructures,
and the influence of different anodization parameters was studied in order to find the most suitable
nanostructure for photocatalysis applications. On the one hand, hydrodynamic conditions were evaluated by
stirring the electrode at different rotation speeds during the electrochemical anodization to check their
influence on the formation of the nanostructures. On the other hand, different heating rates during the
annealing treatment were studied for obtaining efficient iron oxide nanostructures. The synthesized
nanostructures were characterized by different techniques such as photocurrent density vs. potential
measurements, Field Emission Scanning Electron Microscopy, Raman spectroscopy and Incident Photon-toelectron
Conversion Efficiency (IPCE). The results revealed that the best heating rate during the annealing
treatment is 15 ºC·min-1
and that the hydrodynamic conditions allow the formation of nanotubular iron oxide
structures achieving ~0.1 mA·cm-2
at 0.5 V (vs. Ag/AgCl) in the water splitting measurements. Moreover, all
the nanostructures are mainly composed by hematite (¿-Fe2O3) with some amount of magnetite (Fe3O4) in
their structure. Finally, the IPCE measurements showed that the best rotation speed during the
electrochemical anodization for the formation of an efficient iron oxide nanostructure for photocatalysis
applications is 1,000 rpm.Reserva de todos los derechosAbiertohttp://hdl.handle.net/10251/105463AIDIC Serviziapplication/pdf Rita Sánchez Tovar Ramón Manuel Fernández Domene Jose Garcia-AntonChemical Engineering TransactionsInglés
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