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Open AccessArticle

Effect of Sensitization on the Electrochemical Properties of Nanostructured NiO

1
Department of Chemistry, University of Rome “La Sapienza”, p.le A. Moro 5, 00185 Rome, Italy
2
Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, via Pietro Giuria 7, 10125 Torino, Italy
3
ICxT Interdepartmental Centre, Lungo Dora Siena 100, 10153 Torino, Italy
*
Authors to whom correspondence should be addressed.
Coatings 2018, 8(7), 232; https://doi.org/10.3390/coatings8070232
Received: 7 February 2018 / Revised: 11 June 2018 / Accepted: 25 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Thin Films for Energy Harvesting, Conversion, and Storage)
Screen-printed NiO electrodes were sensitized with 11 different dyes and the respective electrochemical properties were analyzed in a three-electrode cell with the techniques of cyclic voltammetry and electrochemical impedance spectroscopy. The dye sensitizers of NiO were organic molecules of different types (e.g., squaraines, coumarins, and derivatives of triphenyl-amines and erythrosine B), which were previously employed as sensitizers of the same oxide in dye-sensitized solar cells of p-type (p-DSCs). Depending on the nature of the sensitizer, diverse types of interactions occurred between the immobilized sensitizer and the screen-printed NiO electrode at rest and under polarization. The impedance data recorded at open circuit potential were interpreted in terms of two different equivalent circuits, depending on the eventual presence of the dye sensitizer on the mesoporous electrode. The fitting parameter of the charge transfer resistance through the electrode/electrolyte interface varied in accordance to the differences of the passivation action exerted by the various dyes against the electrochemical oxidation of NiO. Moreover, it has been observed that the resistive term RCT associated with the process of dark electron transfer between the dye and NiO substrate is strictly correlated to the overall efficiency of the photoconversion (η) of the corresponding p-DSC, which employs the same dye-sensitized electrode as photocathode. View Full-Text
Keywords: nickel oxide; organic sensitizers; dye-sensitized solar cells nickel oxide; organic sensitizers; dye-sensitized solar cells
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Bonomo, M.; Gatti, D.; Barolo, C.; Dini, D. Effect of Sensitization on the Electrochemical Properties of Nanostructured NiO. Coatings 2018, 8, 232.

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