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Author(s): Tânia Lopes
Luísa Andrade
Adélio Mendes
Florian Le Formal
Michael Gratzel
Kevin Sivula
Title: Hematite photoelectrodes for water splitting: Evaluation of the role of film thickness by impedance spectroscopy
Issue Date: 2014
Abstract: The electrochemical behavior of a-Fe2O3 photoelectrodes prepared by spray pyrolysis with differentthicknesses was examined under dark and illumination conditions. The main charge transport phenomenaoccurring 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 circuitmodel for obtaining relevant information concerning reaction kinetics and charge transfer phenomenaoccurring at the semiconductor/electrolyte interface. A three-electrode configuration was used to carry outthe electrochemical measurements allowing a detailed study concerning the double charged layer at thesemiconductor/electrolyte interface that arises under dark conditions. The model parameters determinedby EIS were then related to the film thickness to assess the role of electronic conduction in theperformance of the cell. Moreover, by correlating the sample thickness differences with their electrochemicalimpedance spectroscopy response, it was possible to discriminate the two main phenomena occurring onsemiconductor/electrolyte interfaces of photoelectrochemical systems under dark conditions: the spacecharge layer and the electrical double layer
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/227179 /Nanostructured photoelectrodes for energy conversion/NanoPEC
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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