Resumo (PT):
Abstract (EN):
The electrochemical behavior of a-Fe2O3 photoelectrodes prepared by spray pyrolysis with different
thicknesses was examined under dark and illumination conditions. The main charge transport phenomena
occurring in the PEC cell photoelectrodes were characterized by electrochemical impedance spectroscopy
(EIS) operating under dark conditions. The impedance spectra were fitted to an equivalent electrical circuit
model for obtaining relevant information concerning reaction kinetics and charge transfer phenomena
occurring at the semiconductor/electrolyte interface. A three-electrode configuration was used to carry out
the electrochemical measurements allowing a detailed study concerning the double charged layer at the
semiconductor/electrolyte interface that arises under dark conditions. The model parameters determined
by EIS were then related to the film thickness to assess the role of electronic conduction in the
performance of the cell. Moreover, by correlating the sample thickness differences with their electrochemical
impedance spectroscopy response, it was possible to discriminate the two main phenomena occurring on
semiconductor/electrolyte interfaces of photoelectrochemical systems under dark conditions: the space
charge layer and the electrical double layer
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Notas:
Publicação abrangida pelo Journal Citation Reports 2015
Nº de páginas:
9