Seawater-based electrolytes for Dye-Sensitized Solar Cells
Nicola Sangiorgi a, Alex Sangiorgi a, Stefano Nejrotti a, Simone Galliano b, Ana Yancy Segura Zarate b, Nadia Barbero a b, Matteo Bonomo b, Luca Rivoira b, Mery Malandrino b, Frédéric Sauvage c, Claudia Barolo a b, Alessandra Sanson a
a Institute of Science, Technology and Sustainability for Ceramics, National Research Council of Italy (ISSMC-CNR), Via Granarolo 64, 48018 Faenza (RA) Italy.
b Department of Chemistry, INSTM and NIS Centre, University of Turin, Via Pietro Giuria 7, 10125, Turin, Italy.
c 3 Laboratoire de Réactivité et Chimie des Solides, Université de Picardie Jules Verne (UPJV), CNRS UMR 7314, 33 rue Saint Leu, 80039 Amiens, France.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV25)
Roma, Italy, 2025 May 12th - 14th
Organizers: Filippo De Angelis, Francesca Brunetti and Claudia Barolo
Oral, Nicola Sangiorgi, presentation 273
Publication date: 17th February 2025

Nowadays, increasing the sustainability of solar cells represents one of the most important scientific challenges. The working mechanism of Dye-Sensitized Solar Cells (DSSCs) requires an electrolyte that is typically based on a mixture of organic solvents and salts to achieve highly efficient devices. In this context, seawater-based electrolytes represent an interesting alternative due to their low cost, abundance and suitable chemical composition linked to the naturally occurring ions. [1] For the same reasons, seawater has been recently studied also for water splitting reaction or storage applications. [2,3] Then, in this wok different kinds of seawater electrolytes were prepared and tested considering traditional iodide/triiodide redox mediator. Seawater samples were collected from Italian national seas (i.e., Adriatic, Ligurian and Tyrrhenian) and characterized from the chemical point of view by ICP-OES and conductivity. The optical properties and diffusion of the so-obtained electrolytes were determined by UV-Visible method and cyclic voltammetry in a three-electrode cell. In addition, symmetrical cells were prepared and used to determine their electro-catalytic properties. For this purpose, different counter-electrodes were tested, covering them with the standard platinum layer or with more sustainable materials like carbon-based ones and conducting polymers. Then, the influence of seawater on the electrochemical properties of counter-electrodes was observed and discussed. Finally, DSSCs with reference N719 dye were prepared and tested to demonstrate the real application of seawater electrolytes in a complete device thus highlighting its influence on the photovoltaic performance and interface properties (evaluated by EIS). The reported results indicate that seawater can be consider as a highly sustainable electrolyte for DSSCs; future developments will include an optimization of both dye and counter-electrode to achieve more efficient and stable devices.

This research acknowledges support from the Project CH4.0 under the MUR program “Dipartimenti di Eccellenza 2023−2027” (CUP D13C22003520001). S.G. acknowledges the project NODES which has received funding from the MURM4C2 1.5 of PNRR founded by the European Union - NextGenerationEU (Grant Agreement no. ECS00000036).

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