The impedance response of an electrochemical cell able to convert sunlight into electrical power is analyzed and discussed. Light conversion is due to a photosynthetic system known as reaction center, which is the core of photosynthesis in several living beings. Under illumination, an abrupt transformation drives the cell electrical response from insulator to conductor and a photocurrent is observed. The impedance spectrum shows a peculiar shape which significantly modifies after the protein activation. It has been analyzed by means of a graphical/analytical/numerical procedure. Some impedance graphical representations are indicated as the most appropriate to suggest the design of an equivalent electrical circuit. Then, the analytical expression of this circuit is formulated and used to set-up a custom Phyton code useful for fitting experimental data. Finally, an appropriate normalization procedure is proposed, which validates data in dark and light and can be useful as a fast screening of measurements.

A Biological-based Photo Electrochemical Cell: Modelling the Impedance Spectra

Alfinito, Eleonora
Primo
Membro del Collaboration Group
;
Milano, Francesco
Membro del Collaboration Group
;
Beccaria, Matteo
Membro del Collaboration Group
;
CATALDO, Rosella
Membro del Collaboration Group
;
Giotta, Livia
Membro del Collaboration Group
;
Trotta, Massimo
Membro del Collaboration Group
;
Guascito, Maria Rachele
Ultimo
Membro del Collaboration Group
2020

Abstract

The impedance response of an electrochemical cell able to convert sunlight into electrical power is analyzed and discussed. Light conversion is due to a photosynthetic system known as reaction center, which is the core of photosynthesis in several living beings. Under illumination, an abrupt transformation drives the cell electrical response from insulator to conductor and a photocurrent is observed. The impedance spectrum shows a peculiar shape which significantly modifies after the protein activation. It has been analyzed by means of a graphical/analytical/numerical procedure. Some impedance graphical representations are indicated as the most appropriate to suggest the design of an equivalent electrical circuit. Then, the analytical expression of this circuit is formulated and used to set-up a custom Phyton code useful for fitting experimental data. Finally, an appropriate normalization procedure is proposed, which validates data in dark and light and can be useful as a fast screening of measurements.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/436473
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